Benzene

Formula: C₆H₆
Molecular weight: 78.1118
IUPAC Standard InChI: InChI=1S/C6H6/c1-2-4-6-5-3-1/h1-6H
IUPAC Standard InChIKey: UHOVQNZJYSORNB-UHFFFAOYSA-N
CAS Registry Number: 71-43-2
Chemical structure:
This structure is also available as a 2d Mol file or as a computed 3d SD file
The 3d structure may be viewed using Java or Javascript.
Isotopologues:
- Benzene-D6
Other names: [6]Annulene; Benzol; Benzole; Coal naphtha; Cyclohexatriene; Phenyl hydride; Pyrobenzol; Pyrobenzole; Benzolene; Bicarburet of hydrogen; Carbon oil; Mineral naphtha; Motor benzol; Benzeen; Benzen; Benzin; Benzine; Benzolo; Fenzen; NCI-C55276; Phene; Rcra waste number U019; UN 1114; NSC 67315; 1,3,5-Cyclohexatriene
Permanent link for this species. Use this link for bookmarking this species for future reference.
Information on this page:
Other data available:
- Condensed phase thermochemistry data
- Phase change data
- Reaction thermochemistry data: reactions 1 to 50, reactions 51 to 99
- Henry's Law data
- IR Spectrum
- UV/Visible spectrum
- Gas Chromatography
- Fluid Properties
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Gas phase thermochemistry data

Go To: Top, Gas phase ion energetics data, Ion clustering data, Mass spectrum (electron ionization), Vibrational and/or electronic energy levels, References, Notes

Data compiled as indicated in comments:
DRB - Donald R. Burgess, Jr.
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
GT - Glushko Thermocenter, Russian Academy of Sciences, Moscow

Quantity	Value	Units	Method	Reference	Comment
Δ_fH°_gas	19.8 ± 0.2	kcal/mol	Review	Roux, Temprado, et al., 2008	There are sufficient high-quality literature values to make a good evaluation with a high degree of confidence. In general, the evaluated uncertainty limits are on the order of (0.5 to 2.5) kJ/mol.; DRB
Δ_fH°_gas	19.8	kcal/mol	N/A	Good and Smith, 1969	Value computed using Δ_fH_liquid° value of 49.0±0.5 kj/mol from Good and Smith, 1969 and Δ_vapH° value of 33.9 kj/mol from Prosen, Gilmont, et al., 1945.; DRB
Δ_fH°_gas	19.82 ± 0.12	kcal/mol	Ccb	Prosen, Gilmont, et al., 1945	Hf by Prosen, Johnson, et al., 1946; ALS
Δ_fH°_gas	19.1	kcal/mol	N/A	Landrieu, Baylocq, et al., 1929	Value computed using Δ_fH_liquid° value of 46.0 kj/mol from Landrieu, Baylocq, et al., 1929 and Δ_vapH° value of 33.9 kj/mol from Prosen, Gilmont, et al., 1945.; DRB

Constant pressure heat capacity of gas

C_p,gas (cal/mol*K)	Temperature (K)	Reference	Comment
7.952	50.	Thermodynamics Research Center, 1997	GT
8.391	100.
10.02	150.
12.71	200.
17.82	273.15
19.70	298.15
19.84	300.
27.132	400.
33.305	500.
38.262	600.
42.251	700.
45.519	800.
48.236	900.
50.528	1000.
52.476	1100.
54.140	1200.
55.566	1300.
56.800	1400.
57.866	1500.
59.969	1750.
61.487	2000.
62.608	2250.
63.456	2500.
64.109	2750.
64.620	3000.

Constant pressure heat capacity of gas

C_p,gas (cal/mol*K)	Temperature (K)	Reference	Comment
22.30 ± 0.01	333.15	Todd S.S., 1978	Please also see Montgomery J.B., 1942, Pitzer K.S., 1943, Scott D.W., 1947.; GT
22.90	341.60
23.42 ± 0.01	348.15
24.85 ± 0.01	368.15
25.100	370.
25.041	371.20
26.00 ± 0.30	388.
26.501	390.
26.40 ± 0.30	393.
27.230	402.30
27.32 ± 0.02	403.15
27.600	410.
28.10 ± 0.30	417.
28.40 ± 0.30	428.
29.491	436.15
29.62 ± 0.02	438.15
30.30 ± 0.30	463.
31.649	471.10
31.77 ± 0.02	473.15
31.40 ± 0.30	481.
33.33 ± 0.02	500.15
34.80 ± 0.02	527.15

Gas phase ion energetics data

Go To: Top, Gas phase thermochemistry data, Ion clustering data, Mass spectrum (electron ionization), Vibrational and/or electronic energy levels, References, Notes

Data evaluated as indicated in comments:
HL - Edward P. Hunter and Sharon G. Lias
L - Sharon G. Lias

Data compiled as indicated in comments:
B - John E. Bartmess
MM - Michael M. Meot-Ner (Mautner)
LL - Sharon G. Lias and Joel F. Liebman
LBLHLM - Sharon G. Lias, John E. Bartmess, Joel F. Liebman, John L. Holmes, Rhoda D. Levin, and W. Gary Mallard
LLK - Sharon G. Lias, Rhoda D. Levin, and Sherif A. Kafafi
RDSH - Henry M. Rosenstock, Keith Draxl, Bruce W. Steiner, and John T. Herron

View reactions leading to C₆H₆⁺ (ion structure unspecified)

Quantity	Value	Units	Method	Reference	Comment
IE (evaluated)	9.24378 ± 0.00007	eV	N/A	N/A	L
Quantity	Value	Units	Method	Reference	Comment
Proton affinity (review)	179.3	kcal/mol	N/A	Hunter and Lias, 1998	HL
Quantity	Value	Units	Method	Reference	Comment
Gas basicity	173.4	kcal/mol	N/A	Hunter and Lias, 1998	HL

Proton affinity at 298K

Proton affinity (kcal/mol)	Reference	Comment
178.4	Aue, Guidoni, et al., 2000	Experimental literature data re-evaluated by the authors using ab initio protonation entropies; MM

Gas basicity at 298K

Gas basicity (review) (kcal/mol)	Reference	Comment
172.5	Aue, Guidoni, et al., 2000	Experimental literature data re-evaluated by the authors using ab initio protonation entropies; MM

Ionization energy determinations

IE (eV)	Method	Reference	Comment
9.24384 ± 0.00006	TE	Nemeth, Selzle, et al., 1993	LL
9.24372 ± 0.00005	TE	Chewter, Sander, et al., 1987	LBLHLM
9.20	EI	Stahl and Maquin, 1984	LBLHLM
9.2459 ± 0.0002	S	Grubb, Whetten, et al., 1984	LBLHLM
9.23 ± 0.03	EI	Arimura and Yoshikawa, 1984	LBLHLM
9.25	PE	Klasinc, Kovac, et al., 1983	LBLHLM
9.23	PE	Cetinkaya, Lappert, et al., 1983	LBLHLM
9.25	PE	Kimura, Katsumata, et al., 1981	LLK
9.240 ± 0.002	LS	Duncan, Dietz, et al., 1981	LLK
9.44	EI	Clare and Sowerby, 1981	LLK
9.25	PE	Bieri and Asbrink, 1980	LLK
9.22	PE	Sell, Mintz, et al., 1978	LLK
9.24	PE	Mattsson, Karlsson, et al., 1977	LLK
9.25 ± 0.02	PE	Bieri, Burger, et al., 1977	LLK
9.25 ± 0.07	EI	Selim, 1976	LLK
9.24	PE	Behan, Johnstone, et al., 1976	LLK
9.70	EI	Baldwin, Loudon, et al., 1976	LLK
9.25	CTS	Pitt, 1973	LLK
9.2 ± 0.1	EI	Tajima, Shimizu, et al., 1972	LLK
9.26 ± 0.06	EI	Finney and Harrison, 1972	LLK
9.27	PE	Chizhov, Kleimenov, et al., 1972	LLK
9.24 ± 0.01	PI	Sergeev, Akopyan, et al., 1970	RDSH
9.25 ± 0.01	PI	Demeo and El-Sayed, 1970	RDSH
9.36 ± 0.05	EI	Buchs, 1970	RDSH
9.241 ± 0.001	PE	Asbrink, Lindholm, et al., 1970	RDSH
9.241	TE	Peatman, Borne, et al., 1969	RDSH
9.24 ± 0.01	PE	Dewar and Worley, 1969	RDSH
9.25 ± 0.01	PI	Momigny, Goffart, et al., 1968	RDSH
9.20 ± 0.04	EI	Bock, Seidl, et al., 1968	RDSH
9.24	PE	Baker, May, et al., 1968	RDSH
9.25	PE	Baker, Brundle, et al., 1968	RDSH
9.25 ± 0.02	PE	Clark and Frost, 1967	RDSH
9.26 ± 0.02	EI	Nounou, 1966	RDSH
9.246 ± 0.005	PI	Brehm, 1966	RDSH
9.241 ± 0.006	PI	Nicholson, 1965	RDSH
9.24 ± 0.01	PI	Dibeler and Reese, 1964	RDSH
9.25	PE	Al-Joboury and Turner, 1964	RDSH
9.2	PI	Terenin, 1961	RDSH
9.248	S	El-Sayed, Kaaba, et al., 1961	RDSH
9.247 ± 0.002	S	Wilkinson, 1956	RDSH
9.25 ± 0.01	PI	Watanabe, 1954	RDSH
9.8 ± 0.1	EI	Hustrulid, Kusch, et al., 1938	RDSH
9.242 ± 0.005	S	Price and Wood, 1935	RDSH
9.23	PE	Howell, Goncalves, et al., 1984	Vertical value; LBLHLM
9.25	PE	Kovac, Mohraz, et al., 1980	Vertical value; LLK
9.25	PE	Kaim, Tesmann, et al., 1980	Vertical value; LLK
9.22	PE	Sell and Kupperman, 1978	Vertical value; LLK
9.23	PE	Kobayashi, 1978	Vertical value; LLK
9.3	PE	Klasinc, Novak, et al., 1978	Vertical value; LLK
9.24 ± 0.02	PE	Schmidt, 1977	Vertical value; LLK
9.25 ± 0.05	PE	Gower, Kane-Maguire, et al., 1977	Vertical value; LLK
9.24	PE	Bock, Kaim, et al., 1977	Vertical value; LLK
9.24	PE	Clar and Schmidt, 1976	Vertical value; LLK
9.23	PE	Kobayashi and Nagakura, 1975	Vertical value; LLK
9.24	PE	Bischof, Dewar, et al., 1974	Vertical value; LLK
9.24	PE	Schafer and Schweig, 1972	Vertical value; LLK
9.25 ± 0.03	PE	Klessinger, 1972	Vertical value; LLK
9.24	PE	Bock, Wagner, et al., 1972	Vertical value; LLK
9.2	PE	Carlson and Anderson, 1971	Vertical value; LLK
9.24	PE	Bock and Fuss, 1971	Vertical value; LLK
9.24	PE	Gleiter, Heilbronner, et al., 1970	Vertical value; RDSH

Appearance energy determinations

Ion	AE (eV)	Other Products	Method	Reference	Comment
CH₃⁺	28.2 ± 0.2	?	EI	Olmsted, Street, et al., 1964	RDSH
C₂H₂⁺	19. ± 0.4	?	EI	Lifshitz and Reuben, 1969	RDSH
C₂H₂⁺	18.6	?	EI	Natalis and Franklin, 1965	RDSH
C₂H₂⁺	32.6 ± 0.2	?	EI	Olmsted, Street, et al., 1964	RDSH
C₂H₃⁺	19. ± 0.4	?	EI	Lifshitz and Reuben, 1969	RDSH
C₃H₃⁺	13.43	?	LS	Kuhlewind, Kiermeier, et al., 1986	LBLHLM
C₃H₃⁺	15.34 ± 0.06	C₃H₃	EI	Selim, 1976	LLK
C₃H₃⁺	16.90	C₃H₃	PE	Eland, Frey, et al., 1976	LLK
C₃H₃⁺	13.79	C₃H₃	PI	Rosenstock, Larkins, et al., 1973	LLK
C₃H₃⁺	14.7 ± 0.1	?	EI	Lifshitz and Reuben, 1969	RDSH
C₄H₂⁺	17.5 ± 0.3	?	EI	Lifshitz and Reuben, 1969	RDSH
C₄H₃⁺	18.48 ± 0.07	H+C₂H₂	EI	Selim, 1976	LLK
C₄H₃⁺	17.6 ± 0.1	?	EI	Lifshitz and Reuben, 1969	RDSH
C₄H₄⁺	13.40	C₂H₂	LS	Kuhlewind, Kiermeier, et al., 1986	T = 0K; LBLHLM
C₄H₄⁺	13.9 ± 0.1	C₂H₂	EI	Rosenstock, McCulloh, et al., 1977	LLK
C₄H₄⁺	14.17 ± 0.08	C₂H₂	PI	Rosenstock, McCulloh, et al., 1977	LLK
C₄H₄⁺	14.85	C₂H₂	PE	Eland, Frey, et al., 1976	LLK
C₄H₄⁺	13.85	C₂H₂	PI	Rosenstock, Larkins, et al., 1973	LLK
C₄H₄⁺	14.1	C₂H₂	EI	Hickling and Jennings, 1970	RDSH
C₄H₄⁺	14.5 ± 0.2	C₂H₂	EI	Lifshitz and Reuben, 1969	RDSH
C₅H₃⁺	15.7 ± 0.1	CH₃	EI	Lifshitz and Reuben, 1969	RDSH
C₆H⁺	29. ± 2.	?	EI	Lifshitz and Reuben, 1969	RDSH
C₆H₄⁺	12.93	H₂	LS	Kuhlewind, Kiermeier, et al., 1986	T = 0K; LBLHLM
C₆H₄⁺	14.14 ± 0.08	H₂	EI	Selim, 1976	LLK
C₆H₄⁺	12.94	H₂	PI	Rosenstock, Larkins, et al., 1973	LLK
C₆H₄⁺	14.04 ± 0.06	H₂	EI	Bentley, Johnstone, et al., 1973	LLK
C₆H₄⁺	14.09 ± 0.07	H₂	EI	Natalis and Franklin, 1965	RDSH
C₆H₅⁺	13.12 ± 0.05	H	EVAL	Klippenstein, Faulk, et al., 1993	T = 0K; LL
C₆H₅⁺	12.90	H	LS	Kuhlewind, Kiermeier, et al., 1986	T = 0K; LBLHLM
C₆H₅⁺	13.7 ± 0.1	H	EI	Rosenstock, McCulloh, et al., 1977	LLK
C₆H₅⁺	13.78 ± 0.08	H	PI	Rosenstock, McCulloh, et al., 1977	LLK
C₆H₅⁺	14.56 ± 0.07	H	EI	Selim, 1976	LLK
C₆H₅⁺	12.94	H	PI	Rosenstock, Larkins, et al., 1973	LLK
C₆H₅⁺	13.97 ± 0.06	H	EI	Bentley, Johnstone, et al., 1973	LLK
C₆H₅⁺	14.1 ± 0.1	H	EI	Gross, 1972	LLK
C₆H₅⁺	13.80 ± 0.03	H	PI	Sergeev, Akopyan, et al., 1970	RDSH
C₆H₅⁺	14.1 ± 0.1	H	EI	Lifshitz and Reuben, 1969	RDSH
C₆H₅⁺	13.8 ± 0.1	H	PI	Brehm, 1966	RDSH
C₆H₇₁^-43^-24⁺	14.2 ± 0.2	H₂	EI	Lifshitz and Reuben, 1969	RDSH

De-protonation reactions

C₆H₅^- + = Benzene

By formula: C₆H₅^- + H⁺ = C₆H₆

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	401.22 ± 0.50	kcal/mol	G+TS	Davico, Bierbaum, et al., 1995	gas phase; Revised per Ervin and DeTuro, 2002 change in NH3 acidity. Alecu, Gao, et al., 2007 using thermal methods, agrees with this BDE: 112.8±0.6; value altered from reference due to change in acidity scale; B
Δ_rH°	401.16 ± 0.21	kcal/mol	D-EA	Gunion, Gilles, et al., 1992	gas phase; B
Δ_rH°	400.7 ± 2.5	kcal/mol	TDEq	Meot-ner and Sieck, 1986	gas phase; B
Δ_rH°	401. ± 10.	kcal/mol	CIDT	Graul and Squires, 1990	gas phase; B
Δ_rH°	398.0 ± 5.6	kcal/mol	G+TS	Bohme and Young, 1971	gas phase; B
Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	392.40 ± 0.40	kcal/mol	IMRE	Davico, Bierbaum, et al., 1995	gas phase; Revised per Ervin and DeTuro, 2002 change in NH3 acidity. Alecu, Gao, et al., 2007 using thermal methods, agrees with this BDE: 112.8±0.6; value altered from reference due to change in acidity scale; B
Δ_rG°	390.9 ± 2.0	kcal/mol	TDEq	Meot-ner and Sieck, 1986	gas phase; B
Δ_rG°	390.1 ± 6.5	kcal/mol	IMRB	Bartmess and McIver Jr., 1979	gas phase; B
Δ_rG°	389.2 ± 5.5	kcal/mol	IMRB	Bohme and Young, 1971	gas phase; B

Ion clustering data

Go To: Top, Gas phase thermochemistry data, Gas phase ion energetics data, Mass spectrum (electron ionization), Vibrational and/or electronic energy levels, References, Notes

Data compiled as indicated in comments:
RCD - Robert C. Dunbar
B - John E. Bartmess
M - Michael M. Meot-Ner (Mautner) and Sharon G. Lias

Note: Please consider using the reaction search for this species. This page allows searching of all reactions involving this species. Searches may be limited to ion clustering reactions. A general reaction search form is also available.

Clustering reactions

+ Benzene = ( • Benzene )

By formula: Ag⁺ + C₆H₆ = (Ag⁺ • C₆H₆)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	37.3 ± 1.7	kcal/mol	CIDT	Rodgers and Armentrout, 2000	RCD
Δ_rH°	39.9 ± 4.5	kcal/mol	RAK	Ho, Yang, et al., 1997	RCD

( • Benzene ) + Benzene = ( • 2 Benzene )

By formula: (Ag⁺ • C₆H₆) + C₆H₆ = (Ag⁺ • 2C₆H₆)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	39.9 ± 4.5	kcal/mol	RAK	Ho, Yang, et al., 1997	RCD

+ Benzene = ( • Benzene )

By formula: Al⁺ + C₆H₆ = (Al⁺ • C₆H₆)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	35.1 ± 1.9	kcal/mol	RAK	Dunbar, Klippenstein, et al., 1996	RCD

+ Benzene = ( • Benzene )

By formula: Au⁺ + C₆H₆ = (Au⁺ • C₆H₆)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	70.0	kcal/mol	IMRB	Schroeder, Hrusak, et al., 1995	RCD

+ Benzene = ( • Benzene )

By formula: Bi⁺ + C₆H₆ = (Bi⁺ • C₆H₆)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	<35.5	kcal/mol	PDis	Willey, Yeh, et al., 1992	RCD

+ Benzene = ( • Benzene )

By formula: Br^- + C₆H₆ = (Br^- • C₆H₆)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	9.0 ± 2.0	kcal/mol	TDAs	Hiraoka, Mizuse, et al., 1988	gas phase; B,M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	17.0	cal/mol*K	PHPMS	Hiraoka, Mizuse, et al., 1988	gas phase; M
Δ_rS°	17.	cal/mol*K	N/A	Paul and Kebarle, 1991	gas phase; Entropy change calculated or estimated; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	2.5 ± 1.0	kcal/mol	IMRE	Paul and Kebarle, 1991	gas phase; B
Δ_rG°	3.9 ± 2.6	kcal/mol	TDAs	Hiraoka, Mizuse, et al., 1988	gas phase; B

Free energy of reaction

Δ_rG° (kcal/mol)	T (K)	Method	Reference	Comment
0.0	423.	PHPMS	Paul and Kebarle, 1991	gas phase; Entropy change calculated or estimated; M

CH₆N⁺ + Benzene = (CH₆N⁺ • Benzene )

By formula: CH₆N⁺ + C₆H₆ = (CH₆N⁺ • C₆H₆)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	18.8	kcal/mol	PHPMS	Deakyne and Meot-Ner (Mautner), 1985	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	25.1	cal/mol*K	PHPMS	Deakyne and Meot-Ner (Mautner), 1985	gas phase; M

C₂H₇O⁺ + Benzene = (C₂H₇O⁺ • Benzene )

By formula: C₂H₇O⁺ + C₆H₆ = (C₂H₇O⁺ • C₆H₆)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	21.	kcal/mol	PHPMS	Deakyne and Meot-Ner (Mautner), 1985	gas phase; Entropy change calculated or estimated; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	25.	cal/mol*K	N/A	Deakyne and Meot-Ner (Mautner), 1985	gas phase; Entropy change calculated or estimated; M

Free energy of reaction

Δ_rG° (kcal/mol)	T (K)	Method	Reference	Comment
8.7	491.	PHPMS	Deakyne and Meot-Ner (Mautner), 1985	gas phase; Entropy change calculated or estimated; M

C₃H₃⁺ + Benzene = (C₃H₃⁺ • Benzene )

By formula: C₃H₃⁺ + C₆H₆ = (C₃H₃⁺ • C₆H₆)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	9.0	kcal/mol	HPMS	Field, Hamlet, et al., 1969	gas phase; Entropy change is questionable; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	9.	cal/mol*K	HPMS	Field, Hamlet, et al., 1969	gas phase; Entropy change is questionable; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	6.	kcal/mol	HPMS	Field, Hamlet, et al., 1969	gas phase; Entropy change is questionable; M

C₃H₉Si⁺ + Benzene = (C₃H₉Si⁺ • Benzene )

By formula: C₃H₉Si⁺ + C₆H₆ = (C₃H₉Si⁺ • C₆H₆)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	23.9	kcal/mol	PHPMS	Wojtyniak and Stone, 1986	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	34.7	cal/mol*K	PHPMS	Wojtyniak and Stone, 1986	gas phase; M

C₃H₁₀N⁺ + Benzene = (C₃H₁₀N⁺ • Benzene )

By formula: C₃H₁₀N⁺ + C₆H₆ = (C₃H₁₀N⁺ • C₆H₆)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	15.9	kcal/mol	PHPMS	Deakyne and Meot-Ner (Mautner), 1985	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	27.7	cal/mol*K	PHPMS	Deakyne and Meot-Ner (Mautner), 1985	gas phase; M

C₄H₄S⁺ + Benzene = (C₄H₄S⁺ • Benzene )

By formula: C₄H₄S⁺ + C₆H₆ = (C₄H₄S⁺ • C₆H₆)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	13.	kcal/mol	HPMS	Field, Hamlet, et al., 1969	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	23.	cal/mol*K	HPMS	Field, Hamlet, et al., 1969	gas phase; M

C₄H₉⁺ + Benzene = (C₄H₉⁺ • Benzene )

By formula: C₄H₉⁺ + C₆H₆ = (C₄H₉⁺ • C₆H₆)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	22.	kcal/mol	PHPMS	Sen Sharma, Ikuta, et al., 1982	gas phase; forms protonated t-butylbenzene; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	49.	cal/mol*K	PHPMS	Sen Sharma, Ikuta, et al., 1982	gas phase; forms protonated t-butylbenzene; M

C₆H₅Cl⁺ + Benzene = (C₆H₅Cl⁺ • Benzene )

By formula: C₆H₅Cl⁺ + C₆H₆ = (C₆H₅Cl⁺ • C₆H₆)

Bond type: Charge transfer bond (positive ion)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	14.0	kcal/mol	PHPMS	Meot-Ner (Mautner), Hamlet, et al., 1978	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	26.	cal/mol*K	PHPMS	Meot-Ner (Mautner), Hamlet, et al., 1978	gas phase; M

C₆H₆⁺ + Benzene = (C₆H₆⁺ • Benzene )

By formula: C₆H₆⁺ + C₆H₆ = (C₆H₆⁺ • C₆H₆)

Bond type: Charge transfer bond (positive ion)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	14. ± 8.	kcal/mol	AVG	N/A	Average of 7 out of 10 values; Individual data points
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	28.8	cal/mol*K	PHPMS	Hiraoka, Fujimaki, et al., 1991	gas phase; M
Δ_rS°	27.	cal/mol*K	PHPMS	Meot-Ner (Mautner), Hamlet, et al., 1978	gas phase; M
Δ_rS°	23.	cal/mol*K	HPMS	Field, Hamlet, et al., 1969	gas phase; M

(C₆H₆⁺ • Benzene ) + Benzene = (C₆H₆⁺ • 2 Benzene )

By formula: (C₆H₆⁺ • C₆H₆) + C₆H₆ = (C₆H₆⁺ • 2C₆H₆)

Bond type: Charge transfer bond (positive ion)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	7.8 ± 0.5	kcal/mol	PHPMS	Hiraoka, Fujimaki, et al., 1991	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	19.8	cal/mol*K	PHPMS	Hiraoka, Fujimaki, et al., 1991	gas phase; M

(C₆H₆⁺ • 2 Benzene ) + Benzene = (C₆H₆⁺ • 3 Benzene )

By formula: (C₆H₆⁺ • 2C₆H₆) + C₆H₆ = (C₆H₆⁺ • 3C₆H₆)

Bond type: Charge transfer bond (positive ion)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	7.0	kcal/mol	PHPMS	Hiraoka, Fujimaki, et al., 1991	gas phase; Entropy change calculated or estimated; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	20.	cal/mol*K	N/A	Hiraoka, Fujimaki, et al., 1991	gas phase; Entropy change calculated or estimated; M

(C₆H₆⁺ • 5 Benzene ) + Benzene = (C₆H₆⁺ • 6 Benzene )

By formula: (C₆H₆⁺ • 5C₆H₆) + C₆H₆ = (C₆H₆⁺ • 6C₆H₆)

Bond type: Charge transfer bond (positive ion)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	8.5	kcal/mol	PDiss	Beck and Hecht, 1991	gas phase; M

(C₆H₆⁺ • 6 Benzene ) + Benzene = (C₆H₆⁺ • 7 Benzene )

By formula: (C₆H₆⁺ • 6C₆H₆) + C₆H₆ = (C₆H₆⁺ • 7C₆H₆)

Bond type: Charge transfer bond (positive ion)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	8.3	kcal/mol	PDiss	Beck and Hecht, 1991	gas phase; M

(C₆H₆⁺ • 7 Benzene ) + Benzene = (C₆H₆⁺ • 8 Benzene )

By formula: (C₆H₆⁺ • 7C₆H₆) + C₆H₆ = (C₆H₆⁺ • 8C₆H₆)

Bond type: Charge transfer bond (positive ion)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	8.0	kcal/mol	PDiss	Beck and Hecht, 1991	gas phase; M

(C₆H₆⁺ • 8 Benzene ) + Benzene = (C₆H₆⁺ • 9 Benzene )

By formula: (C₆H₆⁺ • 8C₆H₆) + C₆H₆ = (C₆H₆⁺ • 9C₆H₆)

Bond type: Charge transfer bond (positive ion)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	7.9	kcal/mol	PDiss	Beck and Hecht, 1991	gas phase; M

(C₆H₆⁺ • 9 Benzene ) + Benzene = (C₆H₆⁺ • 10 Benzene )

By formula: (C₆H₆⁺ • 9C₆H₆) + C₆H₆ = (C₆H₆⁺ • 10C₆H₆)

Bond type: Charge transfer bond (positive ion)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	7.8	kcal/mol	PDiss	Beck and Hecht, 1991	gas phase; M

(C₆H₆⁺ • 10 Benzene ) + Benzene = (C₆H₆⁺ • 11 Benzene )

By formula: (C₆H₆⁺ • 10C₆H₆) + C₆H₆ = (C₆H₆⁺ • 11C₆H₆)

Bond type: Charge transfer bond (positive ion)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	7.8	kcal/mol	PDiss	Beck and Hecht, 1991	gas phase; M

(C₆H₆⁺ • 11 Benzene ) + Benzene = (C₆H₆⁺ • 12 Benzene )

By formula: (C₆H₆⁺ • 11C₆H₆) + C₆H₆ = (C₆H₆⁺ • 12C₆H₆)

Bond type: Charge transfer bond (positive ion)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	8.0	kcal/mol	PDiss	Beck and Hecht, 1991	gas phase; M

(C₆H₆⁺ • 12 Benzene ) + Benzene = (C₆H₆⁺ • 13 Benzene )

By formula: (C₆H₆⁺ • 12C₆H₆) + C₆H₆ = (C₆H₆⁺ • 13C₆H₆)

Bond type: Charge transfer bond (positive ion)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	8.3	kcal/mol	PDiss	Beck and Hecht, 1991	gas phase; M

(C₆H₆⁺ • 13 Benzene ) + Benzene = (C₆H₆⁺ • 14 Benzene )

By formula: (C₆H₆⁺ • 13C₆H₆) + C₆H₆ = (C₆H₆⁺ • 14C₆H₆)

Bond type: Charge transfer bond (positive ion)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	8.1	kcal/mol	PDiss	Beck and Hecht, 1991	gas phase; M

C₆H₆NO^- + 2 Benzene = C₁₂H₁₂NO^-

By formula: C₆H₆NO^- + 2C₆H₆ = C₁₂H₁₂NO^-

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	17.5 ± 2.3	kcal/mol	N/A	Le Barbu, Schiedt, et al., 2002	gas phase; Affinity is difference in EAs of lesser solvated species; B

C₆H₇⁺ + Benzene = (C₆H₇⁺ • Benzene )

By formula: C₆H₇⁺ + C₆H₆ = (C₆H₇⁺ • C₆H₆)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	11.0	kcal/mol	PHPMS	Meot-Ner (Mautner), Hamlet, et al., 1978	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	24.	cal/mol*K	PHPMS	Meot-Ner (Mautner), Hamlet, et al., 1978	gas phase; M

C₆H₇N⁺ + Benzene = (C₆H₇N⁺ • Benzene )

By formula: C₆H₇N⁺ + C₆H₆ = (C₆H₇N⁺ • C₆H₆)

Bond type: Charge transfer bond (positive ion)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	11.9	kcal/mol	PHPMS	Meot-Ner (Mautner) and El-Shall, 1986	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	22.6	cal/mol*K	PHPMS	Meot-Ner (Mautner) and El-Shall, 1986	gas phase; M

C₇H₈⁺ + Benzene = (C₇H₈⁺ • Benzene )

By formula: C₇H₈⁺ + C₆H₆ = (C₇H₈⁺ • C₆H₆)

Bond type: Charge transfer bond (positive ion)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	12.2	kcal/mol	MPI	Ernstberger, Krause, et al., 1990	gas phase; M
Δ_rH°	5.5	kcal/mol	PI	Ruhl, Bisling, et al., 1986	gas phase; from vIP of perpendicular dimer; M
Δ_rH°	12.4	kcal/mol	PHPMS	Meot-Ner (Mautner), Hamlet, et al., 1978	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	26.	cal/mol*K	PHPMS	Meot-Ner (Mautner), Hamlet, et al., 1978	gas phase; M

C₇H₉N⁺ + Benzene = (C₇H₉N⁺ • Benzene )

By formula: C₇H₉N⁺ + C₆H₆ = (C₇H₉N⁺ • C₆H₆)

Bond type: Charge transfer bond (positive ion)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	12.3	kcal/mol	PHPMS	Meot-Ner (Mautner) and El-Shall, 1986	gas phase; Entropy change calculated or estimated; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	26.	cal/mol*K	N/A	Meot-Ner (Mautner) and El-Shall, 1986	gas phase; Entropy change calculated or estimated; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	4.6	kcal/mol	PHPMS	Meot-Ner (Mautner) and El-Shall, 1986	gas phase; Entropy change calculated or estimated; M

C₈H₁₁N⁺ + Benzene = (C₈H₁₁N⁺ • Benzene )

By formula: C₈H₁₁N⁺ + C₆H₆ = (C₈H₁₁N⁺ • C₆H₆)

Bond type: Charge transfer bond (positive ion)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	10.0	kcal/mol	PHPMS	Meot-Ner (Mautner) and El-Shall, 1986	gas phase; Entropy change calculated or estimated; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	26.	cal/mol*K	N/A	Meot-Ner (Mautner) and El-Shall, 1986	gas phase; Entropy change calculated or estimated; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	2.2	kcal/mol	PHPMS	Meot-Ner (Mautner) and El-Shall, 1986	gas phase; Entropy change calculated or estimated; M

C₉H₁₂⁺ + Benzene = (C₉H₁₂⁺ • Benzene )

By formula: C₉H₁₂⁺ + C₆H₆ = (C₉H₁₂⁺ • C₆H₆)

Bond type: Charge transfer bond (positive ion)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	10.6	kcal/mol	PHPMS	Meot-Ner (Mautner), Hamlet, et al., 1978	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	26.	cal/mol*K	PHPMS	Meot-Ner (Mautner), Hamlet, et al., 1978	gas phase; M

C₉H₁₃N⁺ + Benzene = (C₉H₁₃N⁺ • Benzene )

By formula: C₉H₁₃N⁺ + C₆H₆ = (C₉H₁₃N⁺ • C₆H₆)

Bond type: Charge transfer bond (positive ion)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	11.2	kcal/mol	PHPMS	Meot-Ner (Mautner) and El-Shall, 1986	gas phase; Entropy change calculated or estimated; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	26.	cal/mol*K	N/A	Meot-Ner (Mautner) and El-Shall, 1986	gas phase; Entropy change calculated or estimated; M

Free energy of reaction

Δ_rG° (kcal/mol)	T (K)	Method	Reference	Comment
2.6	331.	PHPMS	Meot-Ner (Mautner) and El-Shall, 1986	gas phase; Entropy change calculated or estimated; M

C₁₀H₁₀Fe⁺ + Benzene = (C₁₀H₁₀Fe⁺ • Benzene )

By formula: C₁₀H₁₀Fe⁺ + C₆H₆ = (C₁₀H₁₀Fe⁺ • C₆H₆)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	8.	kcal/mol	PHPMS	Meot-Ner (Mautner), 1989	gas phase; Entropy change calculated or estimated, Δ_rH<, DG<; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	20.	cal/mol*K	N/A	Meot-Ner (Mautner), 1989	gas phase; Entropy change calculated or estimated, Δ_rH<, DG<; M

Free energy of reaction

Δ_rG° (kcal/mol)	T (K)	Method	Reference	Comment
3.0	252.	PHPMS	Meot-Ner (Mautner), 1989	gas phase; Entropy change calculated or estimated, Δ_rH<, DG<; M

C₁₁H₁₀⁺ + Benzene = (C₁₁H₁₀⁺ • Benzene )

By formula: C₁₁H₁₀⁺ + C₆H₆ = (C₁₁H₁₀⁺ • C₆H₆)

Bond type: Charge transfer bond (positive ion)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	9.0	kcal/mol	PHPMS	El-Shall and Meot-Ner (Mautner), 1987	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	24.0	cal/mol*K	PHPMS	El-Shall and Meot-Ner (Mautner), 1987	gas phase; M

+ Benzene = ( • Benzene )

By formula: Cd⁺ + C₆H₆ = (Cd⁺ • C₆H₆)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	32.5 ± 4.5	kcal/mol	RAK	Ho, Yang, et al., 1997	RCD

+ Benzene = ( • Benzene )

By formula: Cl^- + C₆H₆ = (Cl^- • C₆H₆)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	6.00 ± 0.46	kcal/mol	N/A	Tschurl, Ueberfluss, et al., 2007	gas phase; B
Δ_rH°	9.4 ± 2.0	kcal/mol	TDAs	Hiraoka, Mizuse, et al., 1988	gas phase; B,M
Δ_rH°	9.90	kcal/mol	IMRE	Larson and McMahon, 1984	gas phase; B,M
Δ_rH°	8.7	kcal/mol	PHPMS	Paul and Kebarle, 1991	gas phase; from Ph. D. thesis of S. Chowdhury, Entropy change calculated or estimated; M
Δ_rH°	10.4	kcal/mol	PHPMS	Sunner, Nishizawa, et al., 1981	gas phase; Entropy change calculated or estimated; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	17.9	cal/mol*K	PHPMS	Hiraoka, Mizuse, et al., 1988	gas phase; M
Δ_rS°	17.	cal/mol*K	N/A	Paul and Kebarle, 1991	gas phase; from Ph. D. thesis of S. Chowdhury, Entropy change calculated or estimated; M
Δ_rS°	17.1	cal/mol*K	N/A	Larson and McMahon, 1984, 2	gas phase; switching reaction(Cl-)t-C4H9OH, Entropy change calculated or estimated; French, Ikuta, et al., 1982; M
Δ_rS°	22.	cal/mol*K	N/A	Sunner, Nishizawa, et al., 1981	gas phase; Entropy change calculated or estimated; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	4.0 ± 2.6	kcal/mol	TDAs	Hiraoka, Mizuse, et al., 1988	gas phase; B
Δ_rG°	3.8 ± 1.6	kcal/mol	IMRE	Chowdhury and Kebarle, 1986	gas phase; B
Δ_rG°	4.8 ± 2.0	kcal/mol	IMRE	Larson and McMahon, 1984	gas phase; B,M
Δ_rG°	3.80	kcal/mol	IMRE	French, Ikuta, et al., 1982	gas phase; B

Free energy of reaction

Δ_rG° (kcal/mol)	T (K)	Method	Reference	Comment
3.6	300.	PHPMS	Paul and Kebarle, 1991	gas phase; from Ph. D. thesis of S. Chowdhury, Entropy change calculated or estimated; M
3.8	300.	PHPMS	Chowdhury and Kebarle, 1986	gas phase; M
3.8	300.	PHPMS	Sunner, Nishizawa, et al., 1981	gas phase; Entropy change calculated or estimated; M

+ Benzene = ( • Benzene )

By formula: Co⁺ + C₆H₆ = (Co⁺ • C₆H₆)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	61.2 ± 2.6	kcal/mol	CIDT	Meyer, Khan, et al., 1995	RCD

Enthalpy of reaction

Δ_rH° (kcal/mol)	T (K)	Method	Reference	Comment
61.1 (+2.5,-0.)		CID	Meyer, Khan, et al., 1995	gas phase; guided ion beam CID; M

( • Benzene ) + Benzene = ( • 2 Benzene )

By formula: (Co⁺ • C₆H₆) + C₆H₆ = (Co⁺ • 2C₆H₆)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	39.9 ± 3.3	kcal/mol	CIDT	Meyer, Khan, et al., 1995	RCD
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	27.8	cal/mol*K	SIDT	Kemper, Bushnell, et al., 1993	gas phase; Δ_rS(490 K); M

Enthalpy of reaction

Δ_rH° (kcal/mol)	T (K)	Method	Reference	Comment
39.9 (+3.2,-0.)		CID	Meyer, Khan, et al., 1995	gas phase; guided ion beam CID; M
27.0 (+1.0,-0.)		SIDT	Kemper, Bushnell, et al., 1993	gas phase; Δ_rS(490 K); M

+ Benzene = ( • Benzene )

By formula: Cr⁺ + C₆H₆ = (Cr⁺ • C₆H₆)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	40.2	kcal/mol	MID	Lin, Chen, et al., 1997	RCD
Δ_rH°	39.2 ± 3.3	kcal/mol	RAK	Lin and Dunbar, 1997	RCD
Δ_rH°	40.6 ± 2.4	kcal/mol	CIDT	Meyer, Khan, et al., 1995	RCD

Enthalpy of reaction

Δ_rH° (kcal/mol)	T (K)	Method	Reference	Comment
40.6 (+2.3,-0.)		CID	Meyer, Khan, et al., 1995	gas phase; guided ion beam CID; M

( • Benzene ) + Benzene = ( • 2 Benzene )

By formula: (Cr⁺ • C₆H₆) + C₆H₆ = (Cr⁺ • 2C₆H₆)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	50.7 ± 9.1	kcal/mol	RAK	Lin and Dunbar, 1997	RCD
Δ_rH°	55.4 ± 4.3	kcal/mol	CIDT	Meyer, Khan, et al., 1995	RCD

Enthalpy of reaction

Δ_rH° (kcal/mol)	T (K)	Method	Reference	Comment
55.3 (+4.4,-0.)		CID	Meyer, Khan, et al., 1995	gas phase; guided ion beam CID; M

+ Benzene = ( • Benzene )

By formula: Cs⁺ + C₆H₆ = (Cs⁺ • C₆H₆)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	15.4 ± 1.2	kcal/mol	CIDT	Amicangelo and Armentrout, 2000	RCD

( • Benzene ) + Benzene = ( • 2 Benzene )

By formula: (Cs⁺ • C₆H₆) + C₆H₆ = (Cs⁺ • 2C₆H₆)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	14.0 ± 1.9	kcal/mol	CIDT	Amicangelo and Armentrout, 2000	RCD

+ Benzene = ( • Benzene )

By formula: Cu⁺ + C₆H₆ = (Cu⁺ • C₆H₆)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	52.1 ± 2.4	kcal/mol	CIDT	Meyer, Khan, et al., 1995	RCD

Enthalpy of reaction

Δ_rH° (kcal/mol)	T (K)	Method	Reference	Comment
52.1 (+2.3,-0.)		CID	Meyer, Khan, et al., 1995	gas phase; guided ion beam CID; M

( • Benzene ) + Benzene = ( • 2 Benzene )

By formula: (Cu⁺ • C₆H₆) + C₆H₆ = (Cu⁺ • 2C₆H₆)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	37.0 ± 2.9	kcal/mol	CIDT	Meyer, Khan, et al., 1995	RCD

Enthalpy of reaction

Δ_rH° (kcal/mol)	T (K)	Method	Reference	Comment
37.1 (+2.8,-0.)		CID	Meyer, Khan, et al., 1995	gas phase; guided ion beam CID; M

+ Benzene = ( • Benzene )

By formula: F^- + C₆H₆ = (F^- • C₆H₆)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	15.30	kcal/mol	TDAs	Hiraoka, Mizuse, et al., 1987	gas phase; B,M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	19.5	cal/mol*K	PHPMS	Hiraoka, Mizuse, et al., 1987	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	9.40	kcal/mol	TDAs	Hiraoka, Mizuse, et al., 1987	gas phase; B

+ Benzene = ( • Benzene )

By formula: Fe⁺ + C₆H₆ = (Fe⁺ • C₆H₆)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	47.1	kcal/mol	RAK	Gapeev and Dunbar, 2002	RCD
Δ_rH°	49.5 ± 2.9	kcal/mol	CIDT	Meyer, Khan, et al., 1995	RCD

Enthalpy of reaction

Δ_rH° (kcal/mol)	T (K)	Method	Reference	Comment
49.6 (+2.3,-0.)		CID	Meyer, Khan, et al., 1995	gas phase; guided ion beam CID; M

( • Benzene ) + Benzene = ( • 2 Benzene )

By formula: (Fe⁺ • C₆H₆) + C₆H₆ = (Fe⁺ • 2C₆H₆)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	44.7 ± 3.8	kcal/mol	CIDT	Meyer, Khan, et al., 1995	RCD

Enthalpy of reaction

Δ_rH° (kcal/mol)	T (K)	Method	Reference	Comment
44.7 (+3.9,-0.)		CID	Meyer, Khan, et al., 1995	gas phase; guided ion beam CID; M

+ Benzene = ( • Benzene )

By formula: H₄N⁺ + C₆H₆ = (H₄N⁺ • C₆H₆)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	19.3	kcal/mol	PHPMS	Deakyne and Meot-Ner (Mautner), 1985	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	23.3	cal/mol*K	PHPMS	Deakyne and Meot-Ner (Mautner), 1985	gas phase; M

( • Benzene ) + Benzene = ( • 2 Benzene )

By formula: (H₄N⁺ • C₆H₆) + C₆H₆ = (H₄N⁺ • 2C₆H₆)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	17.0	kcal/mol	PHPMS	Liebman, Romm, et al., 1991	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	30.5	cal/mol*K	PHPMS	Liebman, Romm, et al., 1991	gas phase; M

( • 2 Benzene ) + Benzene = ( • 3 Benzene )

By formula: (H₄N⁺ • 2C₆H₆) + C₆H₆ = (H₄N⁺ • 3C₆H₆)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	14.2	kcal/mol	PHPMS	Liebman, Romm, et al., 1991	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	32.9	cal/mol*K	PHPMS	Liebman, Romm, et al., 1991	gas phase; M

+ Benzene = ( • Benzene )

By formula: I^- + C₆H₆ = (I^- • C₆H₆)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	6.1 ± 2.0	kcal/mol	TDAs	Hiraoka, Mizuse, et al., 1988	gas phase; B,M
Δ_rH°	9.1 ± 1.0	kcal/mol	TDAs	Caldwell, Masucci, et al., 1989	gas phase; B,M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	14.2	cal/mol*K	PHPMS	Hiraoka, Mizuse, et al., 1988	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	1.8 ± 2.6	kcal/mol	TDAs	Hiraoka, Mizuse, et al., 1988	gas phase; B

+ Benzene = ( • Benzene )

By formula: K⁺ + C₆H₆ = (K⁺ • C₆H₆)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	17.5 ± 0.9	kcal/mol	CIDT	Amicangelo and Armentrout, 2000	RCD
Δ_rH°	19.2	kcal/mol	HPMS	Sunner, Nishizawa, et al., 1981	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	24.6	cal/mol*K	HPMS	Sunner, Nishizawa, et al., 1981	gas phase; M

( • Benzene ) + Benzene = ( • 2 Benzene )

By formula: (K⁺ • C₆H₆) + C₆H₆ = (K⁺ • 2C₆H₆)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	16.1 ± 1.7	kcal/mol	CIDT	Amicangelo and Armentrout, 2000	RCD
Δ_rH°	18.8	kcal/mol	HPMS	Sunner, Nishizawa, et al., 1981	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	33.9	cal/mol*K	HPMS	Sunner, Nishizawa, et al., 1981	gas phase; M

( • 2 Benzene ) + Benzene = ( • 3 Benzene )

By formula: (K⁺ • 2C₆H₆) + C₆H₆ = (K⁺ • 3C₆H₆)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	14.5	kcal/mol	HPMS	Sunner, Nishizawa, et al., 1981	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	32.7	cal/mol*K	HPMS	Sunner, Nishizawa, et al., 1981	gas phase; M

( • 3 Benzene ) + Benzene = ( • 4 Benzene )

By formula: (K⁺ • 3C₆H₆) + C₆H₆ = (K⁺ • 4C₆H₆)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	12.6	kcal/mol	HPMS	Sunner, Nishizawa, et al., 1981	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	41.4	cal/mol*K	HPMS	Sunner, Nishizawa, et al., 1981	gas phase; M

( • Benzene • ) + Benzene = ( • 2 Benzene • )

By formula: (K⁺ • C₆H₆ • H₂O) + C₆H₆ = (K⁺ • 2C₆H₆ • H₂O)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	14.4	kcal/mol	HPMS	Sunner, Nishizawa, et al., 1981	gas phase; From thermochemical cycle,switching reaction(K+ 3H2O)C6H6, Searles and Kebarle, 1969; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	30.1	cal/mol*K	HPMS	Sunner, Nishizawa, et al., 1981	gas phase; From thermochemical cycle,switching reaction(K+ 3H2O)C6H6, Searles and Kebarle, 1969; M

( • Benzene • 2) + Benzene = ( • 2 Benzene • 2)

By formula: (K⁺ • C₆H₆ • 2H₂O) + C₆H₆ = (K⁺ • 2C₆H₆ • 2H₂O)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	12.8	kcal/mol	HPMS	Sunner, Nishizawa, et al., 1981	gas phase; switching reaction(K+ 3H2O)C6H6; Searles and Kebarle, 1969; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	33.7	cal/mol*K	HPMS	Sunner, Nishizawa, et al., 1981	gas phase; switching reaction(K+ 3H2O)C6H6; Searles and Kebarle, 1969; M

( • ) + Benzene = ( • Benzene • )

By formula: (K⁺ • H₂O) + C₆H₆ = (K⁺ • C₆H₆ • H₂O)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	16.8	kcal/mol	HPMS	Sunner, Nishizawa, et al., 1981	gas phase; switching reaction(K+)2H2O; Searles and Kebarle, 1969; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	27.1	cal/mol*K	HPMS	Sunner, Nishizawa, et al., 1981	gas phase; switching reaction(K+)2H2O; Searles and Kebarle, 1969; M

( • 2) + Benzene = ( • Benzene • 2)

By formula: (K⁺ • 2H₂O) + C₆H₆ = (K⁺ • C₆H₆ • 2H₂O)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	13.4	kcal/mol	HPMS	Sunner, Nishizawa, et al., 1981	gas phase; switching reaction(K+)3H2O; Searles and Kebarle, 1969; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	24.3	cal/mol*K	HPMS	Sunner, Nishizawa, et al., 1981	gas phase; switching reaction(K+)3H2O; Searles and Kebarle, 1969; M

( • 3) + Benzene = ( • Benzene • 3)

By formula: (K⁺ • 3H₂O) + C₆H₆ = (K⁺ • C₆H₆ • 3H₂O)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	12.6	kcal/mol	HPMS	Sunner, Nishizawa, et al., 1981	gas phase; switching reaction(K+)4H2O; Searles and Kebarle, 1969; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	27.6	cal/mol*K	HPMS	Sunner, Nishizawa, et al., 1981	gas phase; switching reaction(K+)4H2O; Searles and Kebarle, 1969; M

+ Benzene = ( • Benzene )

By formula: Li⁺ + C₆H₆ = (Li⁺ • C₆H₆)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	38.5 ± 3.2	kcal/mol	CIDT	Amicangelo and Armentrout, 2000	RCD
Δ_rH°	37.9	kcal/mol	ICR	Woodin and Beauchamp, 1978	gas phase; switching reaction(Li+)H2O, Entropy change calculated or estimated; Dzidic and Kebarle, 1970 extrapolated; M
Δ_rH°	36.5	kcal/mol	ICR	Staley and Beauchamp, 1975	gas phase; switching reaction(Li+)H2O, from graph; Dzidic and Kebarle, 1970 extrapolated; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	27.5	cal/mol*K	N/A	Woodin and Beauchamp, 1978	gas phase; switching reaction(Li+)H2O, Entropy change calculated or estimated; Dzidic and Kebarle, 1970 extrapolated; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	29.7	kcal/mol	ICR	Woodin and Beauchamp, 1978	gas phase; switching reaction(Li+)H2O, Entropy change calculated or estimated; Dzidic and Kebarle, 1970 extrapolated; M

( • Benzene ) + Benzene = ( • 2 Benzene )

By formula: (Li⁺ • C₆H₆) + C₆H₆ = (Li⁺ • 2C₆H₆)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	24.9 ± 1.7	kcal/mol	CIDT	Amicangelo and Armentrout, 2000	RCD

+ Benzene = ( • Benzene )

By formula: Mg⁺ + C₆H₆ = (Mg⁺ • C₆H₆)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	32.0 ± 2.3	kcal/mol	CIDT	Andersen, Muntean, et al., 2000	RCD
Δ_rH°	37.0	kcal/mol	RAK	Gapeev and Dunbar, 2000	RCD

+ Benzene = ( • Benzene )

By formula: Mn⁺ + C₆H₆ = (Mn⁺ • C₆H₆)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	34.4	kcal/mol	MID	Lin, Chen, et al., 1997	RCD
Δ_rH°	31.8 ± 2.2	kcal/mol	CIDT	Meyer, Khan, et al., 1995	RCD

Enthalpy of reaction

Δ_rH° (kcal/mol)	T (K)	Method	Reference	Comment
31.8 (+2.1,-0.)		CID	Meyer, Khan, et al., 1995	gas phase; guided ion beam CID; M

( • Benzene ) + Benzene = ( • 2 Benzene )

By formula: (Mn⁺ • C₆H₆) + C₆H₆ = (Mn⁺ • 2C₆H₆)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	48.5 ± 3.8	kcal/mol	CIDT	Meyer, Khan, et al., 1995	RCD

Enthalpy of reaction

Δ_rH° (kcal/mol)	T (K)	Method	Reference	Comment
48.4 (+3.9,-0.)		CID	Meyer, Khan, et al., 1995	gas phase; guided ion beam CID; M

+ Benzene = C₆H₆NO^-

By formula: NO^- + C₆H₆ = C₆H₆NO^-

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	9.5 ± 2.3	kcal/mol	N/A	Le Barbu, Schiedt, et al., 2002	gas phase; Affinity is difference in EAs of lesser solvated species; B

+ Benzene = ( • Benzene )

By formula: NO^- + C₆H₆ = (NO^- • C₆H₆)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	41.1	kcal/mol	ICR	Reents and Freiser, 1981	gas phase; switching reaction,Thermochemical ladder(NO+)C2H5OH, Entropy change calculated or estimated; Farid and McMahon, 1978; M

+ Benzene = ( • Benzene )

By formula: Na⁺ + C₆H₆ = (Na⁺ • C₆H₆)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	22.8 ± 1.4	kcal/mol	CIDC	Amicangelo and Armentrout, 2001	Anchor NH3=24.41; RCD
Δ_rH°	21.1 ± 1.2	kcal/mol	CIDT	Amicangelo and Armentrout, 2000	RCD
Δ_rH°	21.1 ± 1.1	kcal/mol	CIDT	Armentrout and Rodgers, 2000	RCD
Δ_rH°	28.0	kcal/mol	HPMS	Guo, Purnell, et al., 1990	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	31.2	cal/mol*K	HPMS	Guo, Purnell, et al., 1990	gas phase; M

Free energy of reaction

Δ_rG° (kcal/mol)	T (K)	Method	Reference	Comment
15.7	298.	IMRE	McMahon and Ohanessian, 2000	Anchor alanine=39.89; RCD

( • Benzene ) + Benzene = ( • 2 Benzene )

By formula: (Na⁺ • C₆H₆) + C₆H₆ = (Na⁺ • 2C₆H₆)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	20. ± 1.	kcal/mol	AVG	N/A	Average of 7 values; Individual data points

+ Benzene = ( • Benzene )

By formula: Ni⁺ + C₆H₆ = (Ni⁺ • C₆H₆)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	58.1 ± 2.6	kcal/mol	CIDT	Meyer, Khan, et al., 1995	RCD

Enthalpy of reaction

Δ_rH° (kcal/mol)	T (K)	Method	Reference	Comment
58.1 (+2.5,-0.)		CID	Meyer, Khan, et al., 1995	gas phase; guided ion beam CID; M

( • Benzene ) + Benzene = ( • 2 Benzene )

By formula: (Ni⁺ • C₆H₆) + C₆H₆ = (Ni⁺ • 2C₆H₆)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	35.1 ± 2.9	kcal/mol	CIDT	Meyer, Khan, et al., 1995	RCD

Enthalpy of reaction

Δ_rH° (kcal/mol)	T (K)	Method	Reference	Comment
35.1 (+2.8,-0.)		CID	Meyer, Khan, et al., 1995	gas phase; guided ion beam CID; M

+ Benzene = C₆H₆O₂^-

By formula: O₂^- + C₆H₆ = C₆H₆O₂^-

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	14.1 ± 2.3	kcal/mol	N/A	Le Barbu, Schiedt, et al., 2002	gas phase; Affinity is difference in EAs of lesser solvated species; B

+ Benzene = ( • Benzene )

By formula: Pb⁺ + C₆H₆ = (Pb⁺ • C₆H₆)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	26.2	kcal/mol	PHPMS	Guo, Purnell, et al., 1990	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	21.6	cal/mol*K	PHPMS	Guo, Purnell, et al., 1990	gas phase; M

+ Benzene = ( • Benzene )

By formula: Rb⁺ + C₆H₆ = (Rb⁺ • C₆H₆)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	16.4 ± 0.9	kcal/mol	CIDT	Amicangelo and Armentrout, 2000	RCD

( • Benzene ) + Benzene = ( • 2 Benzene )

By formula: (Rb⁺ • C₆H₆) + C₆H₆ = (Rb⁺ • 2C₆H₆)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	15.0 ± 1.9	kcal/mol	CIDT	Amicangelo and Armentrout, 2000	RCD

+ Benzene = ( • Benzene )

By formula: Ti⁺ + C₆H₆ = (Ti⁺ • C₆H₆)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	50.9	kcal/mol	RAK	Gapeev and Dunbar, 2002	RCD
Δ_rH°	61.9 ± 2.2	kcal/mol	CIDT	Meyer, Khan, et al., 1995	RCD

Enthalpy of reaction

Δ_rH° (kcal/mol)	T (K)	Method	Reference	Comment
61.8 (+2.1,-0.)		CID	Meyer, Khan, et al., 1995	gas phase; guided ion beam CID; M

( • Benzene ) + Benzene = ( • 2 Benzene )

By formula: (Ti⁺ • C₆H₆) + C₆H₆ = (Ti⁺ • 2C₆H₆)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	60.5 ± 4.3	kcal/mol	CIDT	Meyer, Khan, et al., 1995	RCD

Enthalpy of reaction

Δ_rH° (kcal/mol)	T (K)	Method	Reference	Comment
60.4 (+4.4,-0.)		CID	Meyer, Khan, et al., 1995	gas phase; guided ion beam CID; M

+ Benzene = ( • Benzene )

By formula: V⁺ + C₆H₆ = (V⁺ • C₆H₆)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	>55.	kcal/mol	RAK	Gapeev and Dunbar, 2002	RCD
Δ_rH°	55.9 ± 2.4	kcal/mol	CIDT	Meyer, Khan, et al., 1995	RCD

Enthalpy of reaction

Δ_rH° (kcal/mol)	T (K)	Method	Reference	Comment
55.8 (+2.3,-0.)		CID	Meyer, Khan, et al., 1995	gas phase; guided ion beam CID; M

( • Benzene ) + Benzene = ( • 2 Benzene )

By formula: (V⁺ • C₆H₆) + C₆H₆ = (V⁺ • 2C₆H₆)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	58.8 ± 4.4	kcal/mol	CID	Meyer, Khan, et al., 1995	gas phase; Δ_rH(0k), guided ion beam CID; M,RCD

(V^- • ) + Benzene = (V^- • Benzene • )

By formula: (V^- • C₆H₅F) + C₆H₆ = (V^- • C₆H₆ • C₆H₅F)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	3. ± 15.	kcal/mol	N/A	Judai, Hirano, et al., 1997	gas phase; B

Mass spectrum (electron ionization)

Go To: Top, Gas phase thermochemistry data, Gas phase ion energetics data, Ion clustering data, Vibrational and/or electronic energy levels, References, Notes

Data compiled by: NIST Mass Spectrometry Data Center, William E. Wallace, director

Spectrum

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Additional Data

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Owner	NIST Mass Spectrometry Data Center Collection (C) 2014 copyright by the U.S. Secretary of Commerce on behalf of the United States of America. All rights reserved.
Origin	NIST Mass Spectrometry Data Center, 1990.
NIST MS number	114388

All mass spectra in this site (plus many more) are available from the NIST/EPA/NIH Mass Spectral Library. Please see the following for information about the library and its accompanying search program.

Vibrational and/or electronic energy levels

Go To: Top, Gas phase thermochemistry data, Gas phase ion energetics data, Ion clustering data, Mass spectrum (electron ionization), References, Notes

Data compiled by: Takehiko Shimanouchi

Symmetry: D_6h Symmetry Number σ = 12

Sym.	No	Approximate	Selected Freq.		Infrared		Raman		Comments

Species		type of mode	Value	Rating	Value	Phase	Value	Phase

a₁g	1	CH str	3062	C	ia		3061.9 VS p	liq.
a₁g	2	Ring str	992	C	ia		991.6 VS p	liq.
a₂g	3	CH bend	1326	E	ia		1326 VW	liq.
a₂u	4	CH bend	673	B	673 S	gas	ia
b₁u	5	CH str	3068	C	3067.57 VW	sln.	ia
b₁u	6	Ring deform	1010	C	1010 W	sln.	ia
b₂g	7	CH bend	995	E	ia		ia		OC(ν₁₉+ν₇,ν₂₀+ν₇)
b₂g	8	Ring deform	703	E	ia		ia		OC(ν₁₉+ν₈, ν₂₀+ν₈)
b₂u	9	Ring str	1310	C	1310 W	liq.	ia
b₂u	10	CH bend	1150	C	1150 W	liq.	ia
e₁g	11	CH bend	849	C	ia		848.9 M dp	liq.
e₁u	12	CH str	3063	E	3080 S	liq.	ia		FR(ν₁₃+ν₁₆)
e₁u	12	CH str	3063	E	3030 S	liq.	ia		FR(ν₁₃+ν₁₆)
e₁u	13	Ring str + deform	1486	B	1486 S	gas	ia
e₁u	14	CH bend	1038	B	1038 S	gas	ia
e₂g	15	CH str	3047	C	ia		3046.8 S dp	liq.
e₂g	16	Ring str	1596	E	ia		1606.4 S dp	liq.	FR(ν₂+ν₁₈)
e₂g	16	Ring str	1596	E	ia		1584.6 S dp	liq.	FR(ν₂+ν₁₈)
e₂g	17	CH bend	1178	C	ia		1178.0 S dp	liq.
e₂g	18	Ring deform	606	C	ia		605.6 S dp	liq.
e₂u	19	CH bend	975	C	975 W	liq.	ia
e₂u	20	Ring deform	410	C	417.7 S	sln.	ia
e₂u	20	Ring deform	410	C	403.0 S	sln.	ia

Source: Shimanouchi, 1972

Notes

Very strong

Strong

Medium

Weak

Very weak

Inactive

Polarized

Depolarized

Fermi resonance with an overtone or a combination tone indicated in the parentheses.

Frequency estimated from an overtone or a combination tone indicated in the parentheses.

1~3 cm^-1 uncertainty

3~6 cm^-1 uncertainty

15~30 cm^-1 uncertainty

References

Go To: Top, Gas phase thermochemistry data, Gas phase ion energetics data, Ion clustering data, Mass spectrum (electron ionization), Vibrational and/or electronic energy levels, Notes

Roux, Temprado, et al., 2008
Roux, M.V.; Temprado, M.; Chickos, J.S.; Nagano, Y., Critically Evaluated Thermochemical Properties of Polycyclic Aromatic Hydrocarbons, J. Phys. Chem. Ref. Data, 2008, 37, 4, 1855-1996. [all data]

Good and Smith, 1969
Good, W.D.; Smith, N.K., Enthalpies of combustion of toluene, benzene, cyclohexane, cyclohexene, methylcyclopentane, 1-methylcyclopentene, and n-hexane, J. Chem. Eng. Data, 1969, 14, 102-106. [all data]

Prosen, Gilmont, et al., 1945
Prosen, E.J.; Gilmont, R.; Rossini, F.D., Heats of combustion of benzene, toluene, ethyl-benzene, o-xylene, m-xylene, p-xylene, n-propylbenzene, and styrene, J. Res. NBS, 1945, 34, 65-70. [all data]

Prosen, Johnson, et al., 1946
Prosen, E.J.; Johnson, W.H.; Rossini, F.D., Heats of combustion and formation at 25°C of the alkylbenzenes through C₁₀H₁₄, and of the higher normal monoalkylbenzenes, J. Res. NBS, 1946, 36, 455-461. [all data]

Landrieu, Baylocq, et al., 1929
Landrieu, P.; Baylocq, F.; Johnson, J.R., Etude thermochimique dans la serie furanique, Bull. Soc. Chim. France, 1929, 45, 36-49. [all data]

Thermodynamics Research Center, 1997
Thermodynamics Research Center, Selected Values of Properties of Chemical Compounds., Thermodynamics Research Center, Texas A&M University, College Station, Texas, 1997. [all data]

Todd S.S., 1978
Todd S.S., Vapor-flow calorimetry of benzene, J. Chem. Thermodyn., 1978, 10, 641-648. [all data]

Montgomery J.B., 1942
Montgomery J.B., The heat capacity of organic vapors. IV. Benzene, fluorobenzene, toluene, cyclohexane, methylcyclohexane and cyclohexene, J. Am. Chem. Soc., 1942, 64, 2375-2377. [all data]

Pitzer K.S., 1943
Pitzer K.S., The thermodynamics and molecular structure of benzene and its methyl derivatives, J. Am. Chem. Soc., 1943, 65, 803-829. [all data]

Scott D.W., 1947
Scott D.W., The heat capacity of benzene vapor. The contribution of anharmonicity, J. Chem. Phys., 1947, 15, 565-568. [all data]

Hunter and Lias, 1998
Hunter, E.P.; Lias, S.G., Evaluated Gas Phase Basicities and Proton Affinities of Molecules: An Update, J. Phys. Chem. Ref. Data, 1998, 27, 3, 413-656, https://doi.org/10.1063/1.556018 . [all data]

Aue, Guidoni, et al., 2000
Aue, D.H.; Guidoni, M.; Betowski, L.D., Ab initio calculated gas-phase basicities of polynuclear aromatic hydrocarbons, Int. J. Mass Spectrom., 2000, 201, 283. [all data]

Nemeth, Selzle, et al., 1993
Nemeth, G.I.; Selzle, H.L.; Schlag, E.W., Magnetic ZEKE experiments with mass analysis, Chem. Phys. Lett., 1993, 215, 151. [all data]

Chewter, Sander, et al., 1987
Chewter, L.A.; Sander, M.; Muller-Dethlefs, K.; Schalg, E.W., High resolution zero kinetic energy photoelectron spectroscopy of benzene and determination of the ionization potential, J. Chem. Phys., 1987, 86, 4737. [all data]

Stahl and Maquin, 1984
Stahl, D.; Maquin, F., Charge-stripping mass spectrometry of molecular ions from polyacenes and molecular orbital theory, Chem. Phys. Lett., 1984, 108, 613. [all data]

Grubb, Whetten, et al., 1984
Grubb, S.G.; Whetten, R.L.; Albrecht, A.C.; Grant, E.R., A precise determination of the first ionization potential of benzene, Chem. Phys. Lett., 1984, 108, 420. [all data]

Arimura and Yoshikawa, 1984
Arimura, M.; Yoshikawa, Y., Ionization efficiency and ionization energy of cyclic compounds by electron impact, Mass Spectrosc. (Tokyo), 1984, 32, 375. [all data]

Klasinc, Kovac, et al., 1983
Klasinc, L.; Kovac, B.; Gusten, H., Photoelectron spectra of acenes. Electronic structure and substituent effects, Pure Appl. Chem., 1983, 55, 289. [all data]

Cetinkaya, Lappert, et al., 1983
Cetinkaya, B.; Lappert, M.F.; Suffolk, R.J., Photoelectron spectra of some sterically hindered phenols and related compounds, J. Chem. Res. Synop., 1983, 316. [all data]

Kimura, Katsumata, et al., 1981
Kimura, K.; Katsumata, S.; Achiba, Y.; Yamazaki, T.; Iwata, S., Ionization energies, Ab initio assignments, and valence electronic structure for 200 molecules in Handbook of HeI Photoelectron Spectra of Fundamental Organic Compounds, Japan Scientific Soc. Press, Tokyo, 1981. [all data]

Duncan, Dietz, et al., 1981
Duncan, M.A.; Dietz, T.G.; Smalley, R.E., Two-color photoionization of naphthalene and benzene at threshold, J. Chem. Phys., 1981, 75, 2118. [all data]

Clare and Sowerby, 1981
Clare, P.; Sowerby, D.B., Electron impact ionisation energies of some halo-cyclotriphosphazenes, J. Inorg. Nucl. Chem., 1981, 43, 477. [all data]

Bieri and Asbrink, 1980
Bieri, G.; Asbrink, L., 30.4-nm He(II) photoelectron spectra of organic molecules, J. Electron Spectrosc. Relat. Phenom., 1980, 20, 149. [all data]

Sell, Mintz, et al., 1978
Sell, J.A.; Mintz, D.M.; Kupperman, A., Photoelectron angular distributions of carbon-carbon π electrons in ethylene, benzene, and their fluorinated derivatives, Chem. Phys. Lett., 1978, 58, 601. [all data]

Mattsson, Karlsson, et al., 1977
Mattsson, L.; Karlsson, L.; Jadrny, R.; Siegbahn, K., Valence electron spectrum of C₆H₆ excited by linearly polarized HeI radiation, Phys. Scr., 1977, 16, 221. [all data]

Bieri, Burger, et al., 1977
Bieri, G.; Burger, F.; Heilbronner, E.; Maier, J.P., Valence ionization enrgies of hydrocarbons, Helv. Chim. Acta, 1977, 60, 2213. [all data]

Selim, 1976
Selim, E.T.M., Electron impact study of benzene, Egypt. J. Phys., 1976, 7, 91. [all data]

Behan, Johnstone, et al., 1976
Behan, J.M.; Johnstone, R.A.W.; Bentley, T.W., An evaluation of empirical methods for calculating the ionization potentials of substituted benzenes, Org. Mass Spectrom., 1976, 11, 207. [all data]

Baldwin, Loudon, et al., 1976
Baldwin, M.A.; Loudon, A.G.; Maccoll, A.; Webb, K.S., The nature and fragmentation pathways of the molecular ions of some arylureas, arylthioureas, acetanilides, thioacetanilides and related compounds, Org. Mass Spectrom., 1976, 11, 1181. [all data]

Pitt, 1973
Pitt, C.G., Hyperconjugation and its role in group IV chemistry, J. Organomet. Chem., 1973, 61, 49. [all data]

Tajima, Shimizu, et al., 1972
Tajima, S.; Shimizu, Y.; Tsuchiya, T., The effect of the shield voltage on appearance potential measurements using a mass spectrometer, Bull. Chem. Soc. Jpn., 1972, 45, 931. [all data]

Finney and Harrison, 1972
Finney, C.D.; Harrison, A.G., A third-derivative method for determining electron-impact onset potentials, Int. J. Mass Spectrom. Ion Phys., 1972, 9, 221. [all data]

Chizhov, Kleimenov, et al., 1972
Chizhov, Yu.V.; Kleimenov, V.I.; Medynskii, G.S.; Vilesov, F.I., Photoelectron spectra of some bromoethylenes and 2-bromopropene, Can. J. Chem., 1972, 50, 2642. [all data]

Sergeev, Akopyan, et al., 1970
Sergeev, Yu.L.; Akopyan, M.E.; Vilesov, F.I.; Kleimenov, V.I., Photoionization processes in phenyl halides, Opt. i Spektroskopiya, 1970, 29, 119, In original 63. [all data]

Demeo and El-Sayed, 1970
Demeo, D.A.; El-Sayed, M.A., Ionization potential and structure of olefins, J. Chem. Phys., 1970, 52, 2622. [all data]

Buchs, 1970
Buchs, A., Etude par spectrometrie de masse de l'ionisation de benzonitriles, de phenylacetonitriles et de N,N-dimethylanilines substitues, Helv. Chim. Acta, 1970, 53, 2026. [all data]

Asbrink, Lindholm, et al., 1970
Asbrink, L.; Lindholm, E.; Edqvist, O., Jahn-Teller effect in the vibrational structure of the photoelectron spectrum of benzene, Chem. Phys. Lett., 1970, 5, 609. [all data]

Peatman, Borne, et al., 1969
Peatman, W.B.; Borne, T.B.; Schlag, E.W., Photoionization resonance spectra. I. Nitric oxide and benzene, Chem. Phys. Lett., 1969, 3, 492. [all data]

Dewar and Worley, 1969
Dewar, M.J.S.; Worley, S.D., Photoelectron spectra of molecules. I. Ionization potentials of some organic molecules and their interpretation, J. Chem. Phys., 1969, 50, 654. [all data]

Momigny, Goffart, et al., 1968
Momigny, J.; Goffart, C.; D'Or, L., Photoionization studies by total ionization measurements. I. Benzene and its monohalogeno derivatives, Intern. J. Mass Spectrom. Ion Phys., 1968, 1, 53. [all data]

Bock, Seidl, et al., 1968
Bock, H.; Seidl, H.; Fochler, M., d-Orbitaleffekte in silicium-substituierten π-Elektronensystemen. X. Vertikale Ionisierungsenergien von Alkyl- und Silyl-benzolen, Chem. Ber., 1968, 101, 2815. [all data]

Baker, May, et al., 1968
Baker, A.D.; May, D.P.; Turner, D.W., Molecular photoelectron spectroscopy. Part VII. The vertical ionisation potentials of benzene and some of its monosubstituted and 1,4-disubstituted derivatives, J. Chem. Soc. B, 1968, 22. [all data]

Baker, Brundle, et al., 1968
Baker, A.D.; Brundle, C.R.; Turner, D.W., The interpretation of photoelectron spectra especially those of benzene and water, Int. J. Mass Spectrom. Ion Phys., 1968, 1, 443. [all data]

Clark and Frost, 1967
Clark, I.D.; Frost, D.C., A study of the energy levels in benzene and some fluorobenzenes by photoelectron spectroscopy, J. Am. Chem. Soc., 1967, 89, 244. [all data]

Nounou, 1966
Nounou, P., Etude des composes aromatiques par spectrometrie de masse. I. Mesure des potentials d'ionisation et d'apparition par la methode du potential retardateur et interpretation des courbes d'ionisation differentielle, J. Chim. Phys., 1966, 63, 994. [all data]

Brehm, 1966
Brehm, B., Massenspektrometrische Untersuchung der Photoionisation von Molekulen, Z. Naturforsch., 1966, 21a, 196. [all data]

Nicholson, 1965
Nicholson, A.J.C., Photoionization-efficiency curves. II. False and genuine structure, J. Chem. Phys., 1965, 43, 1171. [all data]

Dibeler and Reese, 1964
Dibeler, V.H.; Reese, R.M., Mass spectrometric study of photoionization. I. Apparatus and initial observations on acetylene, acetylene-d₂, benzene, and benzene-d₆, J. Res. NBS, 1964, 68A, 409. [all data]

Al-Joboury and Turner, 1964
Al-Joboury, M.I.; Turner, D.W., Molecular photoelectron spectroscopy. Part II. A summary of ionization potentials, J. Chem. Soc., 1964, 4434. [all data]

Terenin, 1961
Terenin, A., Charge transfer in organic solids, induced by light, Proc. Chem. Soc., London, 1961, 321. [all data]

El-Sayed, Kaaba, et al., 1961
El-Sayed, M.F.A.; Kaaba, M.; Tanaka, Y., Ionization potentials of benzene, hexadeuterobenzene, and pyridine from their observed Rydberg series in the region 600-2000 A, J. Chem. Phys., 1961, 34, 334. [all data]

Wilkinson, 1956
Wilkinson, P.G., Absorption spectra and ionization potentials of benzene and benzene-d₆, J. Chem. Phys., 1956, 24, 917. [all data]

Watanabe, 1954
Watanabe, K., Photoionization and total absorption cross section of gases. I. Ionization potentials of several molecules. Cross sections of NH₃ and NO, J. Chem. Phys., 1954, 22, 1564. [all data]

Hustrulid, Kusch, et al., 1938
Hustrulid, A.; Kusch, P.; Tate, J.T., The dissociation of benzene (C₆H₆), pyridine (C₅H₅N) and cyclohexane (C₆H₁₂) by electron impact, Phys. Rev., 1938, 54, 1037. [all data]

Price and Wood, 1935
Price, W.C.; Wood, R.W., The far ultraviolet absorption spectra and ionization potentials of C₆H₆ and C₆D₆, J. Chem. Phys., 1935, 3, 439. [all data]

Howell, Goncalves, et al., 1984
Howell, J.O.; Goncalves, J.M.; Amatore, C.; Klasinc, L.; Wightman, R.M.; Kochi, J.K., Electron transfer from aromatic hydrocarbons and their π-complexes with metals. Comparison of the standard oxidation potentials and vertical ionization potentials, J. Am. Chem. Soc., 1984, 106, 3968. [all data]

Kovac, Mohraz, et al., 1980
Kovac, B.; Mohraz, M.; Heilbronner, E.; Boekelheide, V.; Hopf, H., Photoelectron spectra of the cyclophanes, J. Am. Chem. Soc., 1980, 102, 4314. [all data]

Kaim, Tesmann, et al., 1980
Kaim, W.; Tesmann, H.; Bock, H., Me₃C-, Me₃Si-, Me₃Ge-, Me₃Sn- und Me₃Pb-substituierte benzol- und naphthalin-derivate und ihre radikalanionen, Chem. Ber., 1980, 113, 3221. [all data]

Sell and Kupperman, 1978
Sell, J.A.; Kupperman, A., Angular distributions in the photoelectron spectra of benzene and its monohalogenated derivatives, Chem. Phys., 1978, 33, 367. [all data]

Kobayashi, 1978
Kobayashi, T., A simple general tendency in photoelectron angular distributions of some monosubstituted benzenes, Phys. Lett., 1978, 69, 105. [all data]

Klasinc, Novak, et al., 1978
Klasinc, L.; Novak, I.; Scholz, M.; Kluge, G., Photoelektronenspektren substituierter Pyridine und Benzole und ihre Interpretation durch die CNDO/SWW-Methode, Croat. Chem. Acta, 1978, 51, 43. [all data]

Schmidt, 1977
Schmidt, W., Photoelectron spectra of polynuclear aromatics. V. Correlations with ultraviolet absorption spectra in the catacondensed series, J. Chem. Phys., 1977, 66, 828. [all data]

Gower, Kane-Maguire, et al., 1977
Gower, M.; Kane-Maguire, L.A.P.; Maier, J.P.; Sweigart, D.A., Ultraviolet photoelectron spectra of cyclohepta-1,3,5-triene and mesitylene tricarbonyl complexes of the group 6A metals, J. Chem. Soc. Dalton Trans., 1977, 316. [all data]

Bock, Kaim, et al., 1977
Bock, H.; Kaim, W.; Rohwer, H.E., Radical ions XI*. One-electron oxidation of alkylsilyl benzenes in the gas phase and in solution, J. Organomet. Chem., 1977, 135, 14. [all data]

Clar and Schmidt, 1976
Clar, E.; Schmidt, W., Correlations between photoelectron and phosphorescence spectra of polycyclic hydrocarbons, Tetrahedron, 1976, 32, 2563. [all data]

Kobayashi and Nagakura, 1975
Kobayashi, T.; Nagakura, S., Angular distribution for the photoelectron spectra of benzene and hexafluorobenzene, J. Electron Spectrosc. Relat. Phenom., 1975, 7, 187. [all data]

Bischof, Dewar, et al., 1974
Bischof, P.K.; Dewar, M.J.S.; Goodman, D.W.; Jones, T.B., Photoelectron spectra of molecules. VI. Hyperconjugation versus p_π-d_π bonding in group IVb compounds, J. Organomet. Chem., 1974, 82, 89. [all data]

Schafer and Schweig, 1972
Schafer, W.; Schweig, A., Zur Konjugation in aromatischen Aminen und Phosphanen, Angew. Chem., 1972, 84, 898. [all data]

Klessinger, 1972
Klessinger, M., Ionization potentials of substituted benzenes, Angew. Chem. Int. Ed. Engl., 1972, 11, 525. [all data]

Bock, Wagner, et al., 1972
Bock, H.; Wagner, G.; Kroner, J., Photoelektronenspektren und molekuleigenschaften, XIV. Die delokalisation des schwefel-elektronenpaar in CH₃S-substituierten aromaten, Chem. Ber., 1972, 105, 3850. [all data]

Carlson and Anderson, 1971
Carlson, T.A.; Anderson, C.P., Angular distribution of the photoelectron spectrum for benzene, Chem. Phys. Lett., 1971, 10, 561. [all data]

Bock and Fuss, 1971
Bock, H.; Fuss, W., Arguments concerning the orbital sequence in borazin, Angew. Chem. Int. Ed. Engl., 1971, 10, 182. [all data]

Gleiter, Heilbronner, et al., 1970
Gleiter, R.; Heilbronner, E.; Hornung, V., Lone pair interaction in pyridazine, pyrimidine, and pyrazine, Angew. Chem. Int. Ed. Engl., 1970, 9, 901. [all data]

Olmsted, Street, et al., 1964
Olmsted, J., III; Street, K., Jr.; Newton, A.S., Excess-kinetic-energy ions in organic mass spectra, J. Chem. Phys., 1964, 40, 2114. [all data]

Lifshitz and Reuben, 1969
Lifshitz, C.; Reuben, B.G., Ion-molecule reactions in aromatic systems. I. Secondary ions and reaction rates in benzene, J. Chem. Phys., 1969, 50, 951. [all data]

Natalis and Franklin, 1965
Natalis, P.; Franklin, J.L., Ionization and dissociation of diphenyl and condensed ring aromatics by electron impact. I. Biphenyl, diphenylacetylene, and phenanthrene, J. Phys. Chem., 1965, 69, 2935. [all data]

Kuhlewind, Kiermeier, et al., 1986
Kuhlewind, H.; Kiermeier, A.; Neusser, H.J., Multiphoton ionization in a reflectron time-of-flight mass spectrometer: Individual rates of competing dissociation channels in energy-selected benzene cations [Data derived from reported threshold energies taking value of 9.244 eV for IE[Benzene]], J. Chem. Phys., 1986, 85, 4427. [all data]

Eland, Frey, et al., 1976
Eland, J.H.D.; Frey, R.; Schulte, H.; Brehm, B., New results on the fragmentation of the benzene ion, Int. J. Mass Spectrom. Ion Phys., 1976, 21, 209. [all data]

Rosenstock, Larkins, et al., 1973
Rosenstock, H.M.; Larkins, J.T.; Walker, J.A., Interpretation of photoionization thresholds: Quasiequilibrium theory and the fragmentation of benzene, Int. J. Mass Spectrom. Ion Phys., 1973, 11, 309. [all data]

Rosenstock, McCulloh, et al., 1977
Rosenstock, H.M.; McCulloh, K.E.; Lossing, F.P., On the mechanisms of C₆H₆ ionization fragmentation, Int. J. Mass Spectrom. Ion Phys., 1977, 25, 327. [all data]

Hickling and Jennings, 1970
Hickling, R.D.; Jennings, K.R., Kinetic shifts and metastable transitions, Org. Mass Spectrom., 1970, 3, 1499. [all data]

Bentley, Johnstone, et al., 1973
Bentley, T.W.; Johnstone, R.A.W.; McMaster, B.N., Appearance potentials of metastable and normal ions and the kinetic shift, J. Chem. Soc., Chem. Commun., 1973, 510. [all data]

Klippenstein, Faulk, et al., 1993
Klippenstein, S.J.; Faulk, J.D.; Dunbar, R.C., A combined theoretical and experimental study of the dissociation of benzene cation, J. Chem. Phys., 1993, 98, 243. [all data]

Gross, 1972
Gross, M.L., Ion cyclotron resonance spectrometry. A means of evaluating 'kinetic shifts', Org. Mass Spectrom., 1972, 6, 827. [all data]

Davico, Bierbaum, et al., 1995
Davico, G.E.; Bierbaum, V.M.; Depuy, C.H.; Ellison, G.B.; Squires, R.R., The C-H bond energy of benzene, J. Am. Chem. Soc., 1995, 117, 9, 2590, https://doi.org/10.1021/ja00114a023 . [all data]

Ervin and DeTuro, 2002
Ervin, K.M.; DeTuro, V.F., Anchoring the gas-phase acidity scale, J. Phys. Chem. A, 2002, 106, 42, 9947-9956, https://doi.org/10.1021/jp020594n . [all data]

Alecu, Gao, et al., 2007
Alecu, I.M.; Gao, Y.D.; Hsieh, P.C.; Sand, J.P.; Ors, A.; McLeod, A.; Marshall, P., Studies of the kinetics and thermochemistry of the forward and reverse reaction Cl+C6H6=HCl+C6H5, J. Phys. Chem. A, 2007, 111, 19, 3970-3976, https://doi.org/10.1021/jp067212o . [all data]

Gunion, Gilles, et al., 1992
Gunion, R.F.; Gilles, M.K.; Polak, M.L.; Lineberger, W.C., Ultraviolet Photoelectron Spectroscopy of the Phenide, Benzyl, and Phenoxide Anions., Int. J. Mass Spectrom. Ion Proc., 1992, 117, 601, https://doi.org/10.1016/0168-1176(92)80115-H . [all data]

Meot-ner and Sieck, 1986
Meot-ner, M.; Sieck, L.W., Relative acidities of water and methanol, and the stabilities of the dimer adducts, J. Phys. Chem., 1986, 90, 6687. [all data]

Graul and Squires, 1990
Graul, S.T.; Squires, R.R., Gas-Phase Acidities Derived from Threshold Energies for Activated Reactions, J. Am. Chem. Soc., 1990, 112, 7, 2517, https://doi.org/10.1021/ja00163a007 . [all data]

Bohme and Young, 1971
Bohme, D.K.; Young, L.B., Electron affinities from thermal proton transfer reactions: C₆H₅ and C₆H₅CH₂, Can. J. Chem., 1971, 49, 2918. [all data]

Bartmess and McIver Jr., 1979
Bartmess, J.E.; McIver Jr., The Gas Phase Acidity Scale in Gas Phase Ion Chemistry, Gas Phase Ion Chemistry, V. 2, M.T. Bowers, Ed., Academic Press, NY, 1979, Ch. 11, Elsevier, 1979. [all data]

Rodgers and Armentrout, 2000
Rodgers, M.T.; Armentrout, P.B., Noncovalent Metal-Ligand Bond Energies as Studied by Threshold Collision-Induced Dissociation, Mass Spectrom. Rev., 2000, 19, 4, 215, https://doi.org/10.1002/1098-2787(200007)19:4<215::AID-MAS2>3.0.CO;2-X . [all data]

Ho, Yang, et al., 1997
Ho, Y.-P.; Yang, Y.-C.; Klippenstein, S.J.; Dunbar, R.C., Binding Energies of Ag+ and Cd+ Complexes from Analysis of Radiative Association Kinetics, J. Phys. Chem. A, 1997, 101, 18, 3338, https://doi.org/10.1021/jp9637284 . [all data]

Dunbar, Klippenstein, et al., 1996
Dunbar, R.C.; Klippenstein, S.J.; Hrusak, J.; Stockigt, D.; Schwarz, H., Binding Energy of Al(C6H6)+ from the Analysis of Radiative Association Kinetics, J. Am. Chem. Soc., 1996, 118, 22, 5277, https://doi.org/10.1021/ja953235x . [all data]

Schroeder, Hrusak, et al., 1995
Schroeder, D.; Hrusak, J.; Hertwig, R.H.; Koch, W.; Schwerdtfeger, P.; Schwarz, H., Experimental and Theoretical Studies of Gold(I) Complexes Au(L)+ (L=H2O, CO, NH3, C2H4, C3H6, C4H6, C6H6, C6F6), Organometallics, 1995, 14, 1, 312, https://doi.org/10.1021/om00001a045 . [all data]

Willey, Yeh, et al., 1992
Willey, K.F.; Yeh, C.S.; Robbins, D.L.; Duncan, M.A., Charge-transfer in the photodissociation of metal ion-benzene complexes, J. Phys. Chem., 1992, 96, 23, 9106, https://doi.org/10.1021/j100202a007 . [all data]

Hiraoka, Mizuse, et al., 1988
Hiraoka, K.; Mizuse, S.; Yamabe, S., Determination of the Stabilities and Structures of X-(C6H6) Clusters (X = Cl, Br, and I), Chem. Phys. Lett., 1988, 147, 2-3, 174, https://doi.org/10.1016/0009-2614(88)85078-4 . [all data]

Paul and Kebarle, 1991
Paul, G.J.C.; Kebarle, P., Stabilities of Complexes of Br- with Substituted Benzenes (SB) Based on Determinations of the Gas-Phase Equilibria Br- + SB = (BrSB)-, J. Am. Chem. Soc., 1991, 113, 4, 1148, https://doi.org/10.1021/ja00004a014 . [all data]

Deakyne and Meot-Ner (Mautner), 1985
Deakyne, C.A.; Meot-Ner (Mautner), M., Unconventional Ionic Hydrogen Bonds. 2. NH+ pi. Complexes of Onium Ions with Olefins and Benzene Derivatives, J. Am. Chem. Soc., 1985, 107, 2, 474, https://doi.org/10.1021/ja00288a034 . [all data]

Field, Hamlet, et al., 1969
Field, F.H.; Hamlet, P.; Libby, W.F., Effect of Temperature on the Mass Spectrum of Benzene at High Pressures, J. Am. Chem. Soc., 1969, 91, 11, 2839, https://doi.org/10.1021/ja01039a003 . [all data]

Wojtyniak and Stone, 1986
Wojtyniak, A.C.M.; Stone, A.J., A High-Pressure Mass Spectrometric Study of the Bonding of Trimethylsilylium to Oxygen and Aromatic Bases, Can. J. Chem., 1986, 74, 59. [all data]

Sen Sharma, Ikuta, et al., 1982
Sen Sharma, D.K.; Ikuta, S.; Kebarle, P., Alkylation of Benzene by Alkyl Cations. Stability of the tert - Butyl Benzenium Ion, Can. J. Chem., 1982, 60, 18, 2325, https://doi.org/10.1139/v82-331 . [all data]

Meot-Ner (Mautner), Hamlet, et al., 1978
Meot-Ner (Mautner), M.; Hamlet, P.; Hunter, E.P.; Field, F.H., Bonding Energies in Association Ions of Aromatic Molecules. Correlations with Ionization Energies, J. Am. Chem. Soc., 1978, 100, 17, 5466, https://doi.org/10.1021/ja00485a034 . [all data]

Hiraoka, Fujimaki, et al., 1991
Hiraoka, K.; Fujimaki, S.; Aruga, K.; Yamabe, S., Stability and Structure of Benzene Dimer Cation (C6H6)2+, J. Chem. Phys., 1991, 95, 11, 8413, https://doi.org/10.1063/1.461270 . [all data]

Beck and Hecht, 1991
Beck, S.M.; Hecht, J.H., Photofragmentation of Mass - Selected (C6H6)n+ Clusters: Measurement of Monomer - Cluster Binding Energy for n = 7 - 15, J. Chem. Phys., 1991, 96, 3, 1975, https://doi.org/10.1063/1.462099 . [all data]

Le Barbu, Schiedt, et al., 2002
Le Barbu, K.; Schiedt, J.; Weinkauf, R.; Schlag, E.W.; Nilles, J.M.; Xu, S.J.; Thomas, O.C.; Bowen, K.H., Microsolvation of small anions by aromatic molecules: An exploratory study, J. Chem. Phys., 2002, 116, 22, 9663-9671, https://doi.org/10.1063/1.1475750 . [all data]

Meot-Ner (Mautner) and El-Shall, 1986
Meot-Ner (Mautner), M.; El-Shall, M.S., Ionic Charge Transfer Complexes. 1. Cationic Complexes with Delocalized and Partially Localized pi Systems, J. Am. Chem. Soc., 1986, 108, 15, 4386, https://doi.org/10.1021/ja00275a026 . [all data]

Ernstberger, Krause, et al., 1990
Ernstberger, B.; Krause, H.; Kiermeier, A.; Neusser, H.J., Multiphoton ionization and dissociation of mixed van der Waals clusters in a linear reflectron time-of-flight mass spectrometer, J. Chem. Phys., 1990, 92, 9, 5285, https://doi.org/10.1063/1.458603 . [all data]

Ruhl, Bisling, et al., 1986
Ruhl, E.; Bisling, P.G.F.; Brutschy, B.; Baumgartel, H., Photoionization of Aromatic van der Waals Complexes in a Supersonic Jet, Chem. Phys. Lett., 1986, 126, 3-4, 232, https://doi.org/10.1016/S0009-2614(86)80075-6 . [all data]

Meot-Ner (Mautner), 1989
Meot-Ner (Mautner), M., Ion DChemistry of Ferrocene. Thermochemistry of Ionization and Protonation and Solvent Clustering. Slow and Entropy - Driven Proton - Transfer Kinetics, J. Am. Chem. Soc., 1989, 111, 8, 2830, https://doi.org/10.1021/ja00190a014 . [all data]

El-Shall and Meot-Ner (Mautner), 1987
El-Shall, M.S.; Meot-Ner (Mautner), M., Ionic Charge Transfer Complexes. 3. Delocalised pi Systems as Electron Acceptors and Donors, J. Phys. Chem., 1987, 91, 5, 1088, https://doi.org/10.1021/j100289a017 . [all data]

Tschurl, Ueberfluss, et al., 2007
Tschurl, M.; Ueberfluss, C.; Boesl, U., Anion photoelectron, photodetachment, and infrared dissociation spectra of Cl-center dot C6H6, Chem. Phys. Lett., 2007, 439, 1-3, 23-28, https://doi.org/10.1016/j.cplett.2007.03.059 . [all data]

Larson and McMahon, 1984
Larson, J.W.; McMahon, T.B., Hydrogen bonding in gas phase anions. An experimental investigation of the interaction between chloride ion and bronsted acids from ICR chloride exchange equilibria, J. Am. Chem. Soc., 1984, 106, 517. [all data]

Sunner, Nishizawa, et al., 1981
Sunner, J.; Nishizawa, K.; Kebarle, P., Ion - Solvent Molecule Interactions in the Gas Phase. Potassium Ion and Benzene, J. Phys. Chem., 1981, 85, 13, 1814, https://doi.org/10.1021/j150613a011 . [all data]

Larson and McMahon, 1984, 2
Larson, J.W.; McMahon, T.B., Gas phase negative ion chemistry of alkylchloroformates, Can. J. Chem., 1984, 62, 675. [all data]

French, Ikuta, et al., 1982
French, M.A.; Ikuta, S.; Kebarle, P., Hydrogen bonding of O-H and C-H hydrogen donors to Cl^-. Results from mass spectrometric measurement of the ion-molecule equilibria RH + Cl^- = RHCl^-, Can. J. Chem., 1982, 60, 1907. [all data]

Chowdhury and Kebarle, 1986
Chowdhury, S.; Kebarle, P., Role of Binding Energies in A^-.B and A.B^- Complexes in the Kinetics of Gas Phase Electron Transfer Reactions:A^- + B = A + B^- Involving Perfluoro Compounds: SF₆, C₆F₁₁CF₃, J. Chem. Phys., 1986, 85, 9, 4989, https://doi.org/10.1063/1.451687 . [all data]

Meyer, Khan, et al., 1995
Meyer, F.; Khan, F.A.; Armentrout, P.B., Thermochemistry of Transition Metal Benzene complexes: Binding energies of M(C6H6)x+ (x = 1,2) for M = Ti to Cu, J. Am. Chem. Soc., 1995, 117, 38, 9740, https://doi.org/10.1021/ja00143a018 . [all data]

Kemper, Bushnell, et al., 1993
Kemper, P.R.; Bushnell, J.; Von Koppen, P.; Bowers, M.T., Binding Energies of Co+(H2/CH4/C2H6)1,2,3 Clusters, J. Phys. Chem., 1993, 97, 9, 1810, https://doi.org/10.1021/j100111a016 . [all data]

Lin, Chen, et al., 1997
Lin, C.-Y.; Chen, Q.; Chen, H.; Freiser, B.S., Observing Unimolecular Dissociation of Metastable Ions in FT-ICR: A Novel Application of the Continuous Ejection Technique, J. Phys. Chem. A, 1997, 101, 34, 6023, https://doi.org/10.1021/jp970446a . [all data]

Lin and Dunbar, 1997
Lin, C.-Y.; Dunbar, R.C., Radiative Association Kinetics and Binding Energies of Chromium Ions with Benzene and Benzene Derivatives, Organometallics, 1997, 16, 12, 2691, https://doi.org/10.1021/om960949n . [all data]

Amicangelo and Armentrout, 2000
Amicangelo, J.C.; Armentrout, P.B., Absolute Binding Energies of Alkali-Metal Cation Complexes with Benzene Determined by Threshold Collision-Induced Dissociation Experiments and Ab Initio Theory, J. Phys. Chem. A, 2000, 104, 48, 11420, https://doi.org/10.1021/jp002652f . [all data]

Hiraoka, Mizuse, et al., 1987
Hiraoka, K.; Mizuse, S.; Yamabe, S., A Determination of the Stability and Structure of F^-(C₆H₆) and F^-(C₆F₆) Clusters, J. Chem. Phys., 1987, 86, 7, 4102, https://doi.org/10.1063/1.451920 . [all data]

Gapeev and Dunbar, 2002
Gapeev, A.; Dunbar, R.C., Reactivity and Binding Energies of Transition Metal Halide Ions with Benzene, J. Am. Soc. Mass Spectrom., 2002, 13, 5, 477, https://doi.org/10.1016/S1044-0305(02)00373-2 . [all data]

Liebman, Romm, et al., 1991
Liebman, J.F.; Romm, M.J.; Meot-Ner (Mautner), M.; Cybulski, S.M.; Scheiner, S., Isotropy in ionic interactions. 2. How spherical is the ammonium ion? Comparison of the gas-phase clustering energies and condensed-phase thermochemistry of K+ and NH4+, J. Phys. Chem., 1991, 95, 3, 1112, https://doi.org/10.1021/j100156a018 . [all data]

Caldwell, Masucci, et al., 1989
Caldwell, G.W.; Masucci, J.A.; Ikonomou, M.G., Negative Ion Chemical Ionization Mass Spectrometry - Binding of Molecules to Bromide and Iodide Anions, Org. Mass Spectrom., 1989, 24, 1, 8, https://doi.org/10.1002/oms.1210240103 . [all data]

Searles and Kebarle, 1969
Searles, S.K.; Kebarle, P., Hydration of the Potassium Ion in the Gas Phase: Enthalpies and Entropies of Hydration Reactions K+(H2O)n-1 + H2O = K+(H2O)n for n=1 to n=6, Can. J. Chem., 1969, 47, 14, 2619, https://doi.org/10.1139/v69-432 . [all data]

Woodin and Beauchamp, 1978
Woodin, R.L.; Beauchamp, J.L., Bonding of Li+ to Lewis Bases in the Gas Phase. Reversals in Methyl Substituent Effects for Different Reference Acids, J. Am. Chem. Soc., 1978, 100, 2, 501, https://doi.org/10.1021/ja00470a024 . [all data]

Dzidic and Kebarle, 1970
Dzidic, I.; Kebarle, P., Hydration of the Alkali Ions in the Gas Phase. Enthalpies and Entropies of Reactions M+(H2O)n-1 + H2O = M+(H2O)n, J. Phys. Chem., 1970, 74, 7, 1466, https://doi.org/10.1021/j100702a013 . [all data]

Staley and Beauchamp, 1975
Staley, R.H.; Beauchamp, J.L., Intrinsic Acid - Base Properties of Molecules. Binding Energies of Li+ to pi - and n - Donor Bases, J. Am. Chem. Soc., 1975, 97, 20, 5920, https://doi.org/10.1021/ja00853a050 . [all data]

Andersen, Muntean, et al., 2000
Andersen, A.; Muntean, F.; Walter, D.; Rue, C.; Armentrout, P.B., Collision-Induced Dissociation and Theoretical Studies of Mg+ Complexes with CO, CO2, NH3, CH4, CH3OH, and C6H6, J. Phys. Chem. A, 2000, 104, 4, 692, https://doi.org/10.1021/jp993031t . [all data]

Gapeev and Dunbar, 2000
Gapeev, A.; Dunbar, R.C., Binding of Alkaline Earth Halide Ions MX+ to Benzene and Mesitylene, J. Am. Soc. Mass Spectrom., 2000, 13, 5, 477, https://doi.org/10.1016/S1044-0305(02)00373-2 . [all data]

Reents and Freiser, 1981
Reents, W.D.; Freiser, B.S., Gas-Phase Binding Energies and Spectroscopic Properties of NO+ Charge-Transfer Complexes, J. Am. Chem. Soc., 1981, 103, 2791. [all data]

Farid and McMahon, 1978
Farid, R.; McMahon, T.B., Gas-Phase Ion-Molecule Reactions of Alkyl Nitrites by Ion Cyclotron Resonance Spectroscopy, Int. J. Mass Spectrom. Ion Phys., 1978, 27, 2, 163, https://doi.org/10.1016/0020-7381(78)80037-0 . [all data]

Amicangelo and Armentrout, 2001
Amicangelo, J.C.; Armentrout, P.B., Relative and Absolute Bond Dissociation Energies of Sodium Cation Complexes Determined Using Competitive Collision-Induced Dissociation Experiments, Int. J. Mass Spectrom., 2001, 212, 1-3, 301, https://doi.org/10.1016/S1387-3806(01)00494-8 . [all data]

Armentrout and Rodgers, 2000
Armentrout, P.B.; Rodgers, M.T., An Absolute Sodium Cation Affinity Scale: Threshold Collision-Induced Dissociation Experiments and ab Initio Theory, J. Phys. Chem A, 2000, 104, 11, 2238, https://doi.org/10.1021/jp991716n . [all data]

Guo, Purnell, et al., 1990
Guo, B.C.; Purnell, J.W.; Castleman, A.W., The Clustering Reactions of Benzene with Sodium and Lead Ions, Chem. Phys. Lett., 1990, 168, 2, 155, https://doi.org/10.1016/0009-2614(90)85122-S . [all data]

McMahon and Ohanessian, 2000
McMahon, T.B.; Ohanessian, G., An Experimental and Ab Initio Study of the Nature of the Binding in Gas-Phase Complexes of Sodium Ions, Chem. Eur. J., 2000, 6, 16, 2931, https://doi.org/10.1002/1521-3765(20000818)6:16<2931::AID-CHEM2931>3.0.CO;2-7 . [all data]

Judai, Hirano, et al., 1997
Judai, K.; Hirano, M.; Kawamata, H.; Yabushita, S.; Nakajima, A.; Kaya, K., Formation of Vanadium-Arene Complex Anions and Their Photoelectron Spectroscopy, Chem. Phys. Lett., 1997, 270, 1-2, 23, https://doi.org/10.1016/S0009-2614(97)00336-9 . [all data]

Shimanouchi, 1972
Shimanouchi, T., Tables of Molecular Vibrational Frequencies Consolidated Volume I, National Bureau of Standards, 1972, 1-160. [all data]

Notes

Go To: Top, Gas phase thermochemistry data, Gas phase ion energetics data, Ion clustering data, Mass spectrum (electron ionization), Vibrational and/or electronic energy levels, References

Symbols used in this document:

AE	Appearance energy
C_p,gas	Constant pressure heat capacity of gas
IE (evaluated)	Recommended ionization energy
T	Temperature
Δ_fH°_gas	Enthalpy of formation of gas at standard conditions
Δ_rG°	Free energy of reaction at standard conditions
Δ_rH°	Enthalpy of reaction at standard conditions
Δ_rS°	Entropy of reaction at standard conditions

Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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Benzene

Data at NIST subscription sites:

Gas phase thermochemistry data

Constant pressure heat capacity of gas

Constant pressure heat capacity of gas

Gas phase ion energetics data

Proton affinity at 298K

Gas basicity at 298K

Ionization energy determinations

Appearance energy determinations

De-protonation reactions

Ion clustering data

Clustering reactions

Free energy of reaction

Free energy of reaction

Free energy of reaction

Free energy of reaction

Free energy of reaction

Enthalpy of reaction

Enthalpy of reaction

Enthalpy of reaction

Enthalpy of reaction

Enthalpy of reaction

Enthalpy of reaction

Enthalpy of reaction

Enthalpy of reaction

Enthalpy of reaction

Enthalpy of reaction

Free energy of reaction

Enthalpy of reaction

Enthalpy of reaction

Enthalpy of reaction

Enthalpy of reaction

Enthalpy of reaction

Mass spectrum (electron ionization)

Spectrum

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Credits

Additional Data

Vibrational and/or electronic energy levels

Symmetry: D6h Symmetry Number σ = 12

Notes

References

Notes

Symmetry: D_6h Symmetry Number σ = 12