Hydrogen iodide

Formula: HI
Molecular weight: 127.91241
IUPAC Standard InChI: InChI=1S/HI/h1H
IUPAC Standard InChIKey: XMBWDFGMSWQBCA-UHFFFAOYSA-N
CAS Registry Number: 10034-85-2
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.
Permanent link for this species. Use this link for bookmarking this species for future reference.
Information on this page:
Other data available:
Data at other public NIST sites:
- Microwave spectra (on physics lab web site)
- Gas Phase Kinetics Database
Options:
- Switch to calorie-based units

Data at NIST subscription sites:

NIST / TRC Web Thermo Tables, professional edition (thermophysical and thermochemical data)

NIST subscription sites provide data under the NIST Standard Reference Data Program, but require an annual fee to access. The purpose of the fee is to recover costs associated with the development of data collections included in such sites. Your institution may already be a subscriber. Follow the links above to find out more about the data in these sites and their terms of usage.

Reaction thermochemistry data

Go To: Top, Gas phase ion energetics data, Constants of diatomic molecules, References, Notes

Data compiled as indicated in comments:
B - John E. Bartmess
M - Michael M. Meot-Ner (Mautner) and Sharon G. Lias
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
MS - José A. Martinho Simões

Note: Please consider using the reaction search for this species. This page allows searching of all reactions involving this species. A general reaction search form is also available. Future versions of this site may rely on reaction search pages in place of the enumerated reaction displays seen below.

Individual Reactions

+ Hydrogen iodide = ( • )

By formula: I^- + HI = (I^- • HI)

Bond type: Hydrogen bond (negative ion to hydride)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	71.1 ± 8.4	kJ/mol	TDEq	Caldwell and Kebarle, 1985	gas phase; B,M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	102.	J/mol*K	PHPMS	Caldwell and Kebarle, 1985	gas phase; switching reaction(I-)SO2; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	41. ± 11.	kJ/mol	TDEq	Caldwell and Kebarle, 1985	gas phase; B

Free energy of reaction

Δ_rG° (kJ/mol)	T (K)	Method	Reference	Comment
41.	300.	PHPMS	Caldwell and Kebarle, 1985	gas phase; switching reaction(I-)SO2; M

+ = Hydrogen iodide

By formula: I^- + H⁺ = HI

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	1315.24 ± 0.084	kJ/mol	D-EA	Pelaez, Blondel, et al., 2009	gas phase; Given: 3.0590463(38) eV; B
Δ_rH°	1312.1	kJ/mol	N/A	Check, Faust, et al., 2001	gas phase; Fe(CO)2-(q); ; ΔS(EA)=5.0; B
Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	1294.03 ± 0.25	kJ/mol	H-TS	Pelaez, Blondel, et al., 2009	gas phase; Given: 3.0590463(38) eV; B
Δ_rG°	1290.8	kJ/mol	N/A	Check, Faust, et al., 2001	gas phase; Fe(CO)2-(q); ; ΔS(EA)=5.0; B

Hydrogen iodide + = +

By formula: HI + C₃H₅I = C₃H₆ + I₂

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-33.3 ± 1.4	kJ/mol	Eqk	Rodgers, Golden, et al., 1966	gas phase; ALS
Δ_rH°	-39.7 ± 4.2	kJ/mol	Eqk	Rodgers, Golden, et al., 1966	gas phase; Reanalyzed by Cox and Pilcher, 1970, Original value = -34.9 ± 0.96 kJ/mol; At 527 K; ALS

Hydrogen iodide + = +

By formula: HI + CH₃I = CH₄ + I₂

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-52.55 ± 0.54	kJ/mol	Eqk	Golden, Walsh, et al., 1965	gas phase; ALS
Δ_rH°	-53.0 ± 0.2	kJ/mol	Eqk	Goy and Pritchard, 1965	gas phase; ALS
Δ_rH°	-46.2 ± 5.6	kJ/mol	Cm	Nichol and Ubbelohde, 1952	gas phase; ALS

(l) + (cr) = Hydrogen iodide (g) + (cr)

By formula: C₅HMnO₅ (l) + I₂ (cr) = HI (g) + C₅IMnO₅ (cr)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-108. ± 8.	kJ/mol	RSC	Connor, Zafarani-Moattar, et al., 1982	The reaction enthalpy relies on -25. ± 5. kJ/mol for the enthalpy of solution of HI(g) in benzene Connor, Zafarani-Moattar, et al., 1982.; MS

+ = Hydrogen iodide +

By formula: C₂H₃IO + H₂O = HI + C₂H₄O₂

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-93.97	kJ/mol	Cm	Devore and O'Neal, 1969	liquid phase; Heat of hydrolysis; ALS
Δ_rH°	-90.33	kJ/mol	Cm	Carson and Skinner, 1949	liquid phase; Heat of hydrolysis; ALS

= Hydrogen iodide +

By formula: C₄H₉I = HI + C₄H₈

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-81. ± 2.	kJ/mol	Eqk	Benson and Amano, 1962	gas phase; ALS
Δ_rH°	-80.1 ± 4.2	kJ/mol	Eqk	Jones and Ogg, 1937	gas phase; At 408-464 K; ALS

Hydrogen iodide + = +

By formula: HI + C₆H₁₁I = C₆H₁₂ + I₂

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-32.6 ± 8.4	kJ/mol	Cm	Brennan and Ubbelohde, 1956	gas phase; Reanalyzed by Cox and Pilcher, 1970, Original value = -28. ± 4.2 kJ/mol; ALS

+ = Hydrogen iodide +

By formula: C₂H₃F₃ + I₂ = HI + C₂H₂F₃I

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-64. ± 2.	kJ/mol	Eqk	Wu and Rodgers, 1974	gas phase; Heat of formation Unpublished results by B.J. Zwolinski; ALS

+ = Hydrogen iodide +

By formula: C₇H₉NO + C₇H₅IO = HI + C₁₄H₁₃NO₂

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-185. ± 2.	kJ/mol	Cac	Kiselev, Khuzyasheva, et al., 1979	liquid phase; solvent: Benzene; ALS

+ = Hydrogen iodide +

By formula: C₇H₉N + C₇H₅IO = HI + C₁₄H₁₃NO

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-168. ± 2.	kJ/mol	Cac	Kiselev, Khuzyasheva, et al., 1979	liquid phase; solvent: Benzene; ALS

+ = Hydrogen iodide +

By formula: C₇H₅IO + C₆H₇N = HI + C₁₃H₁₁NO

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-166. ± 2.	kJ/mol	Cac	Kiselev, Khuzyasheva, et al., 1979	liquid phase; solvent: Benzene; ALS

(cr) + (solution) = Hydrogen iodide (solution) + C₈H₅IO₃W (solution)

By formula: C₈H₆O₃W (cr) + I₂ (solution) = HI (solution) + C₈H₅IO₃W (solution)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-67.4 ± 3.8	kJ/mol	RSC	Landrum and Hoff, 1985	solvent: Dichloromethane; MS

C₈H₆MoO₃ (cr) + (solution) = C₈H₅IMoO₃ (solution) + Hydrogen iodide (solution)

By formula: C₈H₆MoO₃ (cr) + I₂ (solution) = C₈H₅IMoO₃ (solution) + HI (solution)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-75.3 ± 2.5	kJ/mol	RSC	Landrum and Hoff, 1985	solvent: Dichloromethane; MS

2 + = 2 Hydrogen iodide +

By formula: 2C₃H₈S + I₂ = 2HI + C₆H₁₄S₂

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-124.9	kJ/mol	Cm	Sunner, 1955	liquid phase; solvent: Ethanol/water(90/10); ALS

2 + = 2 Hydrogen iodide +

By formula: 2C₅H₁₂S + I₂ = 2HI + C₁₀H₂₂S₂

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-124.9	kJ/mol	Cm	Sunner, 1955	liquid phase; solvent: Ethanol/water(90/10); ALS

+ = 2 Hydrogen iodide +

By formula: C₄H₁₀S₂ + I₂ = 2HI + C₄H₈S₂

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-123.2	kJ/mol	Cm	Sunner, 1955	liquid phase; solvent: Ethanol/water(90/10); ALS

+ = 2 Hydrogen iodide +

By formula: C₈H₁₆O₂S₂ + I₂ = 2HI + C₈H₁₄O₂S₂

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-109.6	kJ/mol	Cm	Sunner, 1955	liquid phase; solvent: Ethanol/water(90/10); ALS

+ = 2 Hydrogen iodide +

By formula: C₃H₈S₂ + I₂ = 2HI + C₃H₆S₂

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-107.7	kJ/mol	Cm	Sunner, 1955	liquid phase; solvent: Ethanol/water(90/10); ALS

Hydrogen iodide + = +

By formula: HI + C₇H₇I = C₇H₈ + I₂

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-33. ± 4.6	kJ/mol	Cm	Graham, Nichol, et al., 1955	liquid phase; solvent: p-Xylene; ALS

+ = Hydrogen iodide +

By formula: C₃H₅I + H₂O = HI + C₃H₆O

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-8.79	kJ/mol	Cm	Gellner and Skinner, 1949	liquid phase; Heat of hydrolysis; ALS

+ = Hydrogen iodide +

By formula: C₇H₇I + H₂O = HI + C₇H₈O

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-12.6	kJ/mol	Cm	Gellner and Skinner, 1949	liquid phase; Heat of hydrolysis; ALS

+ = Hydrogen iodide +

By formula: C₇H₅IO + H₂O = HI + C₇H₆O₂

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-102.4	kJ/mol	Cm	Carson, Pritchard, et al., 1950	liquid phase; Heat of hydrolysis; ALS

C₃H₉ISn (l) + (l) = ( Hydrogen iodide • 55) (solution) + C₃H₁₀OSn (cr)

By formula: C₃H₉ISn (l) + H₂O (l) = (HI • 55H₂O) (solution) + C₃H₁₀OSn (cr)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-17.6 ± 0.4	kJ/mol	RSC	Baldwin, Lappert, et al., 1972	MS

Hydrogen iodide + = +

By formula: HI + CH₃IS = CH₄S + I₂

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-12.0 ± 2.3	kJ/mol	Eqk	Shum and Benson, 1983	gas phase; ALS

+ = Hydrogen iodide +

By formula: C₃H₆O + I₂ = HI + C₃H₅IO

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	50.6 ± 5.0	kJ/mol	Eqk	Solly, Golden, et al., 1970	gas phase; ALS

+ = Hydrogen iodide +

By formula: C₂H₄O + I₂ = HI + C₂H₃IO

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	3. ± 2.	kJ/mol	Eqk	Walsh and Benson, 1966	gas phase; ALS

Hydrogen iodide + = +

By formula: HI + C₇H₇IO = C₇H₈O + I₂

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-29. ± 5.0	kJ/mol	Cm	Brennan and Ubbelohde, 1956	gas phase; ALS

Hydrogen iodide + = +

By formula: HI + C₂H₅IS = C₂H₆S + I₂

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-28. ± 4.6	kJ/mol	Kin	Shum and Benson, 1985	gas phase; ALS

C₁₀H₁₂W (cr) + 2 (cr) = C₁₀H₁₀I₂W (cr) + 2 Hydrogen iodide (g)

By formula: C₁₀H₁₂W (cr) + 2I₂ (cr) = C₁₀H₁₀I₂W (cr) + 2HI (g)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-104.3 ± 5.5	kJ/mol	RSC	Calado, Dias, et al., 1979	MS

Hydrogen iodide + = +

By formula: HI + C₇H₅IO = C₇H₆O + I₂

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-13. ± 4.2	kJ/mol	Eqk	Solly and Benson, 1971	gas phase; ALS

C₁₀H₁₁ClZr (cr) + (cr) = C₁₀H₁₀ClIZr (cr) + Hydrogen iodide (g)

By formula: C₁₀H₁₁ClZr (cr) + I₂ (cr) = C₁₀H₁₀ClIZr (cr) + HI (g)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-78.1 ± 2.4	kJ/mol	RSC	Diogo, Simoni, et al., 1993	MS

C₁₀H₁₂Mo (cr) + 2 (cr) = C₁₀H₁₀I₂Mo (cr) + 2 Hydrogen iodide (g)

By formula: C₁₀H₁₂Mo (cr) + 2I₂ (cr) = C₁₀H₁₀I₂Mo (cr) + 2HI (g)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-87.8 ± 5.1	kJ/mol	RSC	Calado, Dias, et al., 1979	MS

+ = Hydrogen iodide +

By formula: C₂H₄F₂ + I₂ = HI + C₂H₃BrF₂

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	51.0 ± 0.8	kJ/mol	Eqk	Pickard and Rodgers, 1977	gas phase; ALS

+ = Hydrogen iodide +

By formula: C₇H₆O + I₂ = HI + C₇H₅IO

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	13. ± 4.2	kJ/mol	Eqk	Solly and Benson, 1971	gas phase; ALS

Hydrogen iodide + = +

By formula: HI + C₆H₅I = C₆H₆ + I₂

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-22. ± 5.9	kJ/mol	Cm	Graham, Nichol, et al., 1955	gas phase; ALS

C₁₀H₁₁IW (cr) + (cr) = C₁₀H₁₀I₂W (cr) + Hydrogen iodide (g)

By formula: C₁₀H₁₁IW (cr) + I₂ (cr) = C₁₀H₁₀I₂W (cr) + HI (g)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-84.6 ± 4.1	kJ/mol	RSC	Calhorda, Dias, et al., 1987	MS

(g) + (g) = Hydrogen iodide (g) + (g)

By formula: I (g) + H₄Ge (g) = HI (g) + H₃Ge (g)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	47.0 ± 4.1	kJ/mol	KinG	Noble and Walsh, 1983	MS

+ = 2 Hydrogen iodide +

By formula: C₅H₁₀ + I₂ = 2HI + C₅H₈

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	102.1	kJ/mol	Eqk	Furuyama, Golden, et al., 1970	gas phase; ALS

Hydrogen iodide + = +

By formula: HI + C₄H₇IO = I₂ + C₄H₈O

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-42.7	kJ/mol	Kin	Solly, Golden, et al., 1970, 2	gas phase; ALS

2 Hydrogen iodide + = +

By formula: 2HI + C₅H₆ = C₅H₈ + I₂

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-89.5	kJ/mol	Eqk	Furuyama, Golden, et al., 1970	gas phase; ALS

Hydrogen iodide + =

By formula: HI + C₃H₆ = C₃H₇I

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-86.27	kJ/mol	Eqk	Furuyama, Golden, et al., 1969	gas phase; ALS

(g) + C₃H₁₀Ge (g) = C₃H₉Ge (g) + Hydrogen iodide (g)

By formula: I (g) + C₃H₁₀Ge (g) = C₃H₉Ge (g) + HI (g)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	42.0 ± 1.8	kJ/mol	KinG	Doncaster and Walsh, 1979	MS

Gas phase ion energetics data

Go To: Top, Reaction thermochemistry data, Constants of diatomic molecules, 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
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 HI⁺ (ion structure unspecified)

Quantity	Value	Units	Method	Reference	Comment
IE (evaluated)	10.386 ± 0.001	eV	N/A	N/A	L
Quantity	Value	Units	Method	Reference	Comment
Proton affinity (review)	627.5	kJ/mol	N/A	Hunter and Lias, 1998	HL
Quantity	Value	Units	Method	Reference	Comment
Gas basicity	601.3	kJ/mol	N/A	Hunter and Lias, 1998	HL

Ionization energy determinations

IE (eV)	Method	Reference	Comment
10.38	PE	Kimura, Katsumata, et al., 1981	LLK
10.386 ± 0.001	S	Eland and Berkowitz, 1977	LLK
10.38 ± 0.01	PE	Lempka, Passmore, et al., 1968	RDSH
10.42 ± 0.01	PE	Frost, McDowell, et al., 1967	RDSH
10.38 ± 0.02	PI	Watanabe, 1957	RDSH
10.3 ± 0.1	EI	Friedman, 1955	RDSH
~10.39	S	Price, 1938	RDSH

Appearance energy determinations

Ion	AE (eV)	Other Products	Method	Reference	Comment
I⁺	13.49 ± 0.13	?	PI	Eland and Berkowitz, 1977	LLK

De-protonation reactions

+ = Hydrogen iodide

By formula: I^- + H⁺ = HI

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	1315.24 ± 0.084	kJ/mol	D-EA	Pelaez, Blondel, et al., 2009	gas phase; Given: 3.0590463(38) eV; B
Δ_rH°	1312.1	kJ/mol	N/A	Check, Faust, et al., 2001	gas phase; Fe(CO)2-(q); ; ΔS(EA)=5.0; B
Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	1294.03 ± 0.25	kJ/mol	H-TS	Pelaez, Blondel, et al., 2009	gas phase; Given: 3.0590463(38) eV; B
Δ_rG°	1290.8	kJ/mol	N/A	Check, Faust, et al., 2001	gas phase; Fe(CO)2-(q); ; ΔS(EA)=5.0; B

Constants of diatomic molecules

Go To: Top, Reaction thermochemistry data, Gas phase ion energetics data, References, Notes

Data compiled by: Klaus P. Huber and Gerhard H. Herzberg

Data collected through September, 1976

Symbols used in the table of constants
Symbol	Meaning
State	electronic state and / or symmetry symbol
T_e	minimum electronic energy (cm^-1)
ω_e	vibrational constant – first term (cm^-1)
ω_ex_e	vibrational constant – second term (cm^-1)
ω_ey_e	vibrational constant – third term (cm^-1)
B_e	rotational constant in equilibrium position (cm^-1)
α_e	rotational constant – first term (cm^-1)
γ_e	rotation-vibration interaction constant (cm^-1)
D_e	centrifugal distortion constant (cm^-1)
β_e	rotational constant – first term, centrifugal force (cm^-1)
r_e	internuclear distance (Å)
Trans.	observed transition(s) corresponding to electronic state
ν₀₀	position of 0-0 band (units noted in table)

Diatomic constants for H¹²⁷I
State	T_e	ω_e	ω_ex_e	ω_ey_e	B_e	α_e	γ_e	D_e	β_e	r_e	Trans.	ν₀₀
L	[100640] 1										L ← X	99500
L	↳Terwilliger and Smith, 1975
H (1)	[75435] 2										H ← X	74290
H (1)	↳missing citation; missing citation
F ¹Δ	[71372.8]				[6.33₅] 3			[2.₃E-4] 3		[1.631]	F ← X R	70228.2 Z
F ¹Δ	↳missing citation
f₁ ³Δ₁	[70831.5]				[6.01₅] 4					[1.674]	f₁ ← X R	69686.9 Z
f₁ ³Δ₁	↳missing citation
State	T_e	ω_e	ω_ex_e	ω_ey_e	B_e	α_e	γ_e	D_e	β_e	r_e	Trans.	ν₀₀
D ¹Π	[70389.0]				[6.198] 5			[2.1E-4] 5		[1.649]	D ← X R	69244.4 Z
D ¹Π	↳missing citation
d₀ ³Π₀	[70302.4]				[6.117] 6			[2.1E-4] 6		[1.660]	d₀ ← X R	69157.8 6 Z
	↳missing citation
	7
	↳Ginter, Tilford, et al., 1975
G 1	[70136.4]				[6.406] 8			[3.2E-4] 8		[1.622]	G ← X R	68991.8 Z
G 1	↳missing citation; missing citation
State	T_e	ω_e	ω_ex_e	ω_ey_e	B_e	α_e	γ_e	D_e	β_e	r_e	Trans.	ν₀₀
V ¹Σ⁺					[2.84] 9			[2.0E-4] 9		[2.44] 9	V ← X R	68004.4 9 Z
V ¹Σ⁺	↳missing citation
E ¹Σ⁺	(66326)	[1681.8] Z			[6.110]	10		[2.5E-4] 10		[1.661₁]	E ← X R	66022.6 Z
E ¹Σ⁺	↳missing citation; missing citation
f₂ ³Δ₂	[65838.6]				[6.757] 11			[12.₃E-4] 11		[1.580]	f₂ ← X V	64694.0 Z
f₂ ³Δ₂	↳missing citation
f₃ ³Δ₃	[65717.5]				[5.706] 12			[-8.3E-4] 12		[1.719]	f₃ ← X R	64572.9 Z
f₃ ³Δ₃	↳missing citation
State	T_e	ω_e	ω_ex_e	ω_ey_e	B_e	α_e	γ_e	D_e	β_e	r_e	Trans.	ν₀₀
e ³Σ⁺	[65345] 13										e ← X	64200
e ³Σ⁺	↳missing citation
d₁ ³Π₁	[65028] 14										d₁ ← X	63883 H^Q
d₁ ³Π₁	↳missing citation
d₂ ³Π₂	(63922)	[2154.4] Z			[6.065]	15		1.7E-4		[1.667₃]	d₂ ← X R	63854.9 Z
d₂ ³Π₂	↳missing citation
C ¹Π	(62378)	[2183] H^Q 16									C ← X	62325 H^Q
C ¹Π	↳Price, 1938; Tilford, Ginter, et al., 1970
State	T_e	ω_e	ω_ex_e	ω_ey_e	B_e	α_e	γ_e	D_e	β_e	r_e	Trans.	ν₀₀
b₀ ³Π₀₊	60858.7	2314.7 17 Z	54.3 17		6.493 17	0.118 17				1.611₄	b₀ ← X	60857.9 Z
b₀ ³Π₀₊	↳missing citation; missing citation
b₀ ³Π_0-	(60840) 18	2314.7 17 Z	54.3 17		6.493 17	0.118 17				1.611₄	b₀ ← X	60839 H^Q
b₀ ³Π_0-	↳missing citation
b₁ ³Π₁	(56783)	[2200]			[6.427] 19					[1.619₆]	b₁ ← X	56738.3 Z
b₁ ³Π₁	↳Price, 1938; Tilford, Ginter, et al., 1970
b₂ ³Π₂	(55874)	[2207.4] Z			6.436	0.175				1.618₅	b₂ ← X	55833.1 Z
b₂ ³Π₂	↳missing citation
State	T_e	ω_e	ω_ex_e	ω_ey_e	B_e	α_e	γ_e	D_e	β_e	r_e	Trans.	ν₀₀
A (¹Π)	20										A ← X 21
	↳Goodeve and Taylor, 1936; Datta and Kundu, 1941; Romand, 1949; Huebert and Martin, 1968; Ogilvie, 1971
	20										a ← X 21
	↳Goodeve and Taylor, 1936; Datta and Kundu, 1941; Romand, 1949; Huebert and Martin, 1968; Ogilvie, 1971
(³Π₀₊)	20										A ← X 21
(³Π₀₊)	↳Goodeve and Taylor, 1936; Datta and Kundu, 1941; Romand, 1949; Huebert and Martin, 1968; Ogilvie, 1971
(³Π₁)	20										a ← X 21
(³Π₁)	↳Goodeve and Taylor, 1936; Datta and Kundu, 1941; Romand, 1949; Huebert and Martin, 1968; Ogilvie, 1971
State	T_e	ω_e	ω_ex_e	ω_ey_e	B_e	α_e	γ_e	D_e	β_e	r_e	Trans.	ν₀₀
X ¹Σ⁺	0	2309.01₄ Z	39.643₅ 22	-0.0200	[6.4263650] 23 24	0.1688₆ 25	-0.00095	[2.069E-4] 23		1.60916 26
	↳Boyd and Thompson, 1952; Haeusler, Meyer, et al., 1964; Hurlock, Alexander, et al., 1971; Bernage, Niay, et al., 1974
										27
	↳Czerny, 1927; Palik, 1955; Cowan and Gordy, 1956; De Lucia, Helminger, et al., 1971
										28
	↳Cherlow, Hyatt, et al., 1975

Notes

Broad absorption peak (width ~4500 cm^-1). 31

First member of a Rydberg series converging to X ² Π_1/2 (v=0) of HI⁺ (I.P. = 11.05 eV); fragments of additional series. 32

Average B and D, B(2⁺) - B(2^-)= -0.05.

Average of B value, B(1⁺) - B(1^-) = +0.240.

Refers to the 1⁺ component; B(1^-) ~ 6.25.

Constants refer to the 0⁺ component; for 0^- B₀ = 6.091, v₀₀ = 69149.5.

Additional unclassified absorption bands between 68100 and 69000 cm^-1.

missing note

Vibrational numbering uncertain; the numbers given refer to the lowest level observed in absorption for which v is probably fairly high. Several higher vibrational levels have been found; strong perturbations.

B₁ = 5.62, D₁= 28E-4, perturbed at high J.

Average B and D, B(2⁺) - B(2^-) = -0.040.

Average B and D, B(3⁺) - B(3^-) = +0.018.

Very diffuse feature.

Diffuse feature.

B₁(³Π₂)= -5.92₃.

Diffuse, no rotational structure.

From v=0, 1, 3 only; γr_e = -0.031₇.

Diffuse Q head only.

(v=1 diffuse Q head)

Continuous absorption starting at ~28000 with maximum at ~46000 cm^-1.

Photofragment spectroscopy at 37550 cm^-1 Clear, Riley, et al., 1975 shows that the continuum is of composite nature; 36% of the absorption is due to ³Π₀₊ yielding H + I(²P_1/2). Clear, Riley, et al., 1975 have analyzed the continuum in terms of three overlapping transitions ¹Π, ³Π₀₊, ³Π₁ ← X. A very weak continuum with maximum at 23500 cm^-1 was reported by Datta and Kundu, 1941.

w_ez_e = +0.01621, from the 1-0,...,4-0 vibrational-rotational bands Hurlock, Alexander, et al., 1971; very slightly different constants are given by Bernage, Niay, et al., 1974 who have measured the 5-0 and 6-0 bands.

Microwave value De Lucia, Helminger, et al., 1971.

Dunham potential coefficients Ogilvie and Koo, 1976.

γ_e from Hurlock, Alexander, et al., 1971, see 22.

Rot.-vib. sp. 34

Rotation sp. 35 36

Raman sp. 37

From D₀⁰(H₂), D₀⁰(I₂), and ΔH_f0(HI, from gaseous H₂,I₂).

From photoionization studies by Watanabe, Nakayama, et al., 1962; refers to X ²Π_3/2 of HI⁺. Lempka, Passmore, et al., 1968 give the same value, Frost, McDowell, et al., 1967 give 10.42 eV from the photoelectron spectrum.

Diffuse on account of predissociation and preionization; presumably first member of a Rydberg series converging to A ²Σ⁺ of HI⁺ Terwilliger and Smith, 1975.

Above the first ionization limit (X ²Π_3/2) the members of the series are subject to preionization and are seen as photoionization peaks Tsai and Baer, 1974.

Average B and D, B(1⁺) - B(1^-) = +0.107.

The 1-0,...,6-0 bands have been observed in absorption. Absolute intensities, dipole moment function Ameer and Beneschi, 1962, Benesch, 1963, Meyer, Haeusler, et al., 1965, Jacobi, 1967, Tipping and Forbes, 1971. The R branch of the fundamental is much stronger than the P branch on account of rotation-vibration interaction; for the overtones this effect is very small Benesch, 1963, Meyer, Haeusler, et al., 1965. The overall intensities decrease rather slowly in the series 1-0, 2-0, 3-0 Benesch, 1963, Meyer, Haeusler, et al., 1965. Line width, pressure broadening studied by Ameer and Beneschi, 1962, Meyer, Haeusler, et al., 1965.

From the hfs of the microwave spectrum Van Dijk and Dymanus, 1968 derive nuclear quadrupole (I) and other hyperfine coupling constants; see also De Lucia, Helminger, et al., 1971. From the Stark effect in the hfs of the 1-0 transition van Dijk and Dymanus, 1970 obtain μ_el(v=0) = 0.4477.

Absolute intensities Chamberlain and Gebbie, 1965.

Vibrational Raman cross sections.

References

Go To: Top, Reaction thermochemistry data, Gas phase ion energetics data, Constants of diatomic molecules, Notes

Caldwell and Kebarle, 1985
Caldwell, G.; Kebarle, P., The hydrogen bond energies of the bihalide ions XHX- and YHX-, Can. J. Chem., 1985, 63, 1399. [all data]

Pelaez, Blondel, et al., 2009
Pelaez, R.J.; Blondel, C.; Delsart, C.; Drag, C., Pulsed photodetachment microscopy and the electron affinity of iodine, J. Phys. B: Atom. Mol. Opt. Phys., 2009, 42, 12, 125001, https://doi.org/10.1088/0953-4075/42/12/125001 . [all data]

Check, Faust, et al., 2001
Check, C.E.; Faust, T.O.; Bailey, J.M.; Wright, B.J.; Gilbert, T.M.; Sunderlin, L.S., Addition of Polarization and Diffuse Functions to the LANL2DZ Basis Set for P-Block Elements, J. Phys. Chem. A,, 2001, 105, 34, 8111, https://doi.org/10.1021/jp011945l . [all data]

Rodgers, Golden, et al., 1966
Rodgers, A.S.; Golden, D.M.; Benson, S.W., The thermochemistry of the gas phase equilibrium I₂ + C₃H₆ = C₃H₅I + HI, J. Am. Chem. Soc., 1966, 88, 3194-3196. [all data]

Cox and Pilcher, 1970
Cox, J.D.; Pilcher, G., Thermochemistry of Organic and Organometallic Compounds, Academic Press, New York, 1970, 1-636. [all data]

Golden, Walsh, et al., 1965
Golden, D.M.; Walsh, R.; Benson, S.W., The thermochemistry of the gas phase equilibrium I₂ + CH₄ «=» CH₃I + HI and the heat of formation of the methyl radical, J. Am. Chem. Soc., 1965, 87, 4053-4057. [all data]

Goy and Pritchard, 1965
Goy, C.A.; Pritchard, H.O., Kinetics and thermodynamics of the reaction between iodine and methane and the heat of formation of methyl iodide, J. Phys. Chem., 1965, 69, 3040-3041. [all data]

Nichol and Ubbelohde, 1952
Nichol, R.J.; Ubbelohde, A.R., A thermochemical evaluation of bond strengths in some carbon compounds. part II. Bond strengths based on the reaction CH₃I + HI = CH₄ + I₂, J. Am. Chem. Soc., 1952, 415-421. [all data]

Connor, Zafarani-Moattar, et al., 1982
Connor, J.A.; Zafarani-Moattar, M.T.; Bickerton, J.; El-Saied, N.I.; Suradi, S.; Carson, R.; Al Takkhin, G.; Skinner, H.A., Organomet., 1982, 1, 1166. [all data]

Devore and O'Neal, 1969
Devore, J.A.; O'Neal, H.E., Heats of formation of the acetyl halides and of the acetyl radical, J. Phys. Chem., 1969, 73, 2644-2648. [all data]

Carson and Skinner, 1949
Carson, A.S.; Skinner, H.A., 201. Carbon-halogen bond energies in the acetyl halides, J. Chem. Soc., 1949, 936-939. [all data]

Benson and Amano, 1962
Benson, S.W.; Amano, A., Thermodynamic properties of tertiary iodides, J. Chem. Phys., 1962, 37, 197-198. [all data]

Jones and Ogg, 1937
Jones, J.L.; Ogg, R.A., Jr., The equilibrium (CH₃)₃CI = (CH₃)₂C = CH₂ + HI, J. Am. Chem. Soc., 1937, 59, 1943-1945. [all data]

Brennan and Ubbelohde, 1956
Brennan, D.; Ubbelohde, A.R., A thermochemical evaluation of bond strengths in some carbon compounds. Part IV. Bond-strength differences based on the reaction: RI + HI = RH + I₂, where R = p-methoxyphenyl and cyclohexyl, J. Chem. Soc., 1956, 3011-3016. [all data]

Wu and Rodgers, 1974
Wu, E.; Rodgers, A.S., Thermochemistry of gas-phase equilibrium CF₃CH₃ + I₂ = CF₃CH₂I + HI. The carbon-hydrogen bond dissociation energy in 1,1,1-trifluoroethane and the heat of formation of the 2,2,2-trifluoroethyl radical, J. Phys. Chem., 1974, 78, 2315-2317. [all data]

Kiselev, Khuzyasheva, et al., 1979
Kiselev, V.D.; Khuzyasheva, d.G.; Konovalov, A.I., Thermochemical study of the acylation of para-substituted anilines, J. Gen. Chem. USSR, 1979, 49, 2273-2276. [all data]

Landrum and Hoff, 1985
Landrum, J.T.; Hoff, C.D., J. Organometal. Chem., 1985, 282, 215. [all data]

Sunner, 1955
Sunner, S., Strain in 6,8-thioctic acid, Nature (London), 1955, 176, 217. [all data]

Graham, Nichol, et al., 1955
Graham, W.S.; Nichol, R.J.; Ubbelohde, A.R., A thermochemical evaluation of bond strengths in some carbon compounds. Part III. Bond strengths based on the reactions: (a) Ph·CH₂I + HI=Ph·CH₃ + I₂ and (b) PhI + HI=PhH + I₂, J. Chem. Soc., 1955, 115-121. [all data]

Gellner and Skinner, 1949
Gellner, O.H.; Skinner, H.A., Dissociation energies of carbon-halogen bonds. The bond strengths allyl-X and benzyl-X, J. Chem. Soc., 1949, 1145-1148. [all data]

Carson, Pritchard, et al., 1950
Carson, A.S.; Pritchard, H.O.; Skinner, H.A., The heats of hydrolysis of the benzoyl halides, J. Chem. Soc., 1950, 656-659. [all data]

Baldwin, Lappert, et al., 1972
Baldwin, J.C.; Lappert, M.F.; Pedley, J.B.; Poland, J.S., J. Chem. Soc., Dalton Trans., 1972, 1943.. [all data]

Shum and Benson, 1983
Shum, L.G.S.; Benson, S.W., Thermochemnistry and kinetics of the reaction of methyl mercaptan with iodine, Int. J. Chem. Kinet., 1983, 15, 433-453. [all data]

Solly, Golden, et al., 1970
Solly, R.K.; Golden, D.M.; Benson, S.W., Thermochemical properties of iodoacetone. Intramolecular electrostatic interactions in polar molecules, J. Am. Chem. Soc., 1970, 92, 4653-4656. [all data]

Walsh and Benson, 1966
Walsh, R.; Benson, S.W., The heats of formation of acetyl iodide and the acetyl radical, J. Phys. Chem., 1966, 70, 3751-3753. [all data]

Shum and Benson, 1985
Shum, L.G.S.; Benson, S.W., Iodine catalyzed pyrolysis of dimethyl sulfide. Heats of formaton of CH₃SCH₂I, the CH₃SCH₂ radical, and the pibond energy in CH₂S, Int. J. Chem. Kinet., 1985, 17, 277-292. [all data]

Calado, Dias, et al., 1979
Calado, J.C.G.; Dias, A.R.; Martinho Simões, J.A.; Ribeiro da Silva, M.A.V., Rev. Port. Quím., 1979, 21, 129. [all data]

Solly and Benson, 1971
Solly, R.K.; Benson, S.W., Thermochemistry of the reaction of benzaldehyde with iodine. The enthalpy of formation of benzaldehyde and benzoyl iodide, J. Chem. Thermodyn., 1971, 3, 203-209. [all data]

Diogo, Simoni, et al., 1993
Diogo, H.P.; Simoni, J.A.; Minas da Piedade, M.E.; Dias, A.R.; Martinho Simões, J.A., J. Am. Chem. Soc., 1993, 115, 2764. [all data]

Pickard and Rodgers, 1977
Pickard, J.M.; Rodgers, A.S., The kinetics and thermochemistry of the reaction of 1,1-difluoroethane with iodine. The difluoromethylene-hydrogen bond dissociation energy in 1,1-difluoroethane and the heat of formation of 1,1-difluoroethyl, J. Am. Chem. Soc., 1977, 99, 691-694. [all data]

Calhorda, Dias, et al., 1987
Calhorda, M.J.; Dias, A.R.; Minas da Piedade M.E.; Salema, M.S.; Martinho Simões J.A., Organometallics, 1987, 6, 734. [all data]

Noble and Walsh, 1983
Noble, P.N.; Walsh, R., Kinetics of the gas phase reaction between iodine and monogermane and the bond dissociation energy D(H₃Ge-H), Int. J. Chem. Kinet., 1983, 15, 547. [all data]

Furuyama, Golden, et al., 1970
Furuyama, S.; Golden, D.M.; Benson, S.W., Thermochemistry of cyclopentene and cyclopentadiene from studies of gas-phase equilibria, J. Chem. Thermodyn., 1970, 2, 161-169. [all data]

Solly, Golden, et al., 1970, 2
Solly, R.K.; Golden, D.M.; Benson, S.W., Kinetics and thermochemistry of the gas phase reaction of methyl ethyl ketone with iodine. II. The heat of formation and unimolecular decomposition of 2-iodo-3-butanone, Int. J. Chem. Kinet., 1970, 2, 393-407. [all data]

Furuyama, Golden, et al., 1969
Furuyama, S.; Golden, D.M.; Benson, S.W., Thermochemistry of the gas phase equilibria i-C₃H₇I = C₃H₆ + HI, n-C₃H₇I = i-C₃H₇I, and C₃H₆ + 2HI = C₃H₈ + I₂, J. Chem. Thermodyn., 1969, 1, 363-375. [all data]

Doncaster and Walsh, 1979
Doncaster, A.M.; Walsh, R., J. Phys. Chem., 1979, 83, 578. [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]

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]

Eland and Berkowitz, 1977
Eland, J.H.D.; Berkowitz, J., Photoionization mass spectrometry of HI and DI at high resolution, J. Chem. Phys., 1977, 67, 5034. [all data]

Lempka, Passmore, et al., 1968
Lempka, H.J.; Passmore, T.R.; Price, W.C., The photoelectron spectra and ionized states of the halogen acids, Proc. Roy. Soc. (London), 1968, A304, 53. [all data]

Frost, McDowell, et al., 1967
Frost, D.C.; McDowell, C.A.; Vroom, D.A., Photoelectron spectra of the halogens and the hydrogen halides, J. Chem. Phys., 1967, 46, 4255. [all data]

Watanabe, 1957
Watanabe, K., Ionization potentials of some molecules, J. Chem. Phys., 1957, 26, 542. [all data]

Friedman, 1955
Friedman, L., Mass spectrum of lithium iodide, J. Chem. Phys., 1955, 23, 477. [all data]

Price, 1938
Price, W.C., The absorption spectra of the halogen acids in the vacuum ultra-violet, Proc. Roy. Soc. (London), 1938, A167, 216. [all data]

Terwilliger and Smith, 1975
Terwilliger, D.T.; Smith, A.L., Autoionization in diatomics: measured line shape parameters and predicted photoelectron spectra for some autoionizing states of the hydrogen halides, J. Chem. Phys., 1975, 63, 1008. [all data]

Ginter, Tilford, et al., 1975
Ginter, M.L.; Tilford, S.G.; Bass, A.M., Electronic spectra and structure of the hydrogen halides. States associated with the (σ²π³)cσ and (σ²π³)cπ configurations of HI and DI, J. Mol. Spectrosc., 1975, 57, 271. [all data]

Tilford, Ginter, et al., 1970
Tilford, S.G.; Ginter, M.L.; Bass, A.M., Electronic spectra and structure of the hydrogen halides. The b³Π_i and C¹Π states of HI and DI, J. Mol. Spectrosc., 1970, 34, 327. [all data]

Goodeve and Taylor, 1936
Goodeve, C.F.; Taylor, A.W.C., The continuous absorption spectrum of hydrogen iodide, Proc. R. Soc. London A, 1936, 154, 181. [all data]

Datta and Kundu, 1941
Datta, S.; Kundu, D.N., The continuous absorption spectra of the hydrogen-halides. Part III - HI, Proc. Natl. Inst. Sci. India, 1941, 7, 311. [all data]

Romand, 1949
Romand, J., Absorption ultraviolette dans la region de Schumann etude de: ClH, BrH et lH gazeux, Ann. Phys. (Paris), 1949, 4, 527. [all data]

Huebert and Martin, 1968
Huebert, B.J.; Martin, R.M., Gas-phase far-ultraviolet absorption spectrum of hydrogen bromide and hydrogen iodide, J. Phys. Chem., 1968, 72, 3046. [all data]

Ogilvie, 1971
Ogilvie, J.F., Semi-experimental determination of a repulsive potential curve for hydrogen iodide, Trans. Faraday Soc., 1971, 67, 2205. [all data]

Boyd and Thompson, 1952
Boyd, D.R.J.; Thompson, H.W., The fundamental vibration band of hydrogen iodide, Spectrochim. Acta, 1952, 5, 308. [all data]

Haeusler, Meyer, et al., 1964
Haeusler, C.; Meyer, C.; Barchewitz, P., Constantes de vibration et de rotation de l'acide iodhydrique gazeux etude des bandes d'absorption v_0-2 et v_0-4, J. Phys. (Paris), 1964, 25, 961. [all data]

Hurlock, Alexander, et al., 1971
Hurlock, S.C.; Alexander, R.M.; Rao, K.N.; Dreska, N., Infrared bands of HI and DI, J. Mol. Spectrosc., 1971, 37, 373. [all data]

Bernage, Niay, et al., 1974
Bernage, P.; Niay, P.; Houdart, R., Notes des membres et correspondants et notes presentees ou transmises par leurs soins, C.R. Acad. Sci. Paris, Ser. B, 1974, 278, 235. [all data]

Czerny, 1927
Czerny, M., Die rotationsspektren der halogenwasserstoffe, Z. Phys., 1927, 44, 235. [all data]

Palik, 1955
Palik, E.D., The pure rotational spectra of DBr, HI, and DI in the spectral region between 45 and 170 microns, J. Chem. Phys., 1955, 23, 217. [all data]

Cowan and Gordy, 1956
Cowan, M.; Gordy, W., Further extension of microwave spectroscopy in the submillimeter wave region, Phys. Rev., 1956, 104, 551. [all data]

De Lucia, Helminger, et al., 1971
De Lucia, F.C.; Helminger, P.; Gordy, W., Submillimeter-wave spectra and equilibrium structures of the hydrogen halides, Phys. Rev. A: Gen. Phys., 1971, 3, 1849. [all data]

Cherlow, Hyatt, et al., 1975
Cherlow, J.M.; Hyatt, H.A.; Porto, S.P.S., Raman scattering in hydrogen halide gases, J. Chem. Phys., 1975, 63, 3996. [all data]

Clear, Riley, et al., 1975
Clear, R.D.; Riley, S.J.; Wilson, K.R., Energy partitioning and assignment of excited states in the ultraviolet photolysis of HI and DI, J. Chem. Phys., 1975, 63, 1340. [all data]

Ogilvie and Koo, 1976
Ogilvie, J.F.; Koo, D., Dunham potential energy coefficients of the hydrogen halides and carbon monoxide, J. Mol. Spectrosc., 1976, 61, 332-336. [all data]

Watanabe, Nakayama, et al., 1962
Watanabe, K.; Nakayama, T.; Mottl, J., Ionization potentials of some molecules, J. Quant. Spectry. Radiative Transfer, 1962, 2, 369. [all data]

Tsai and Baer, 1974
Tsai, B.P.; Baer, T., Analysis of autoionizing Rydberg states in HI and CH₃I. Comments on Rydberg electron wavefunctions, J. Chem. Phys., 1974, 61, 2047. [all data]

Ameer and Beneschi, 1962
Ameer, G.; Beneschi, W., Line strengths and widths in hydrogen iodide, J. Chem. Phys., 1962, 37, 2699. [all data]

Benesch, 1963
Benesch, W., Simultaneous measurement of HI fundamental and overtone lines, J. Chem. Phys., 1963, 39, 1048. [all data]

Meyer, Haeusler, et al., 1965
Meyer, C.; Haeusler, C.; Barchewitz, P., Intensites et largeurs des raies de vibration-rotation de molecules diatomiques, J. Phys. (Paris), 1965, 26, 305. [all data]

Jacobi, 1967
Jacobi, N., Electrical anharmonicities of diatomic molecules, J. Mol. Spectrosc., 1967, 22, 76. [all data]

Tipping and Forbes, 1971
Tipping, R.H.; Forbes, A., Dipole moment function of HI, J. Mol. Spectrosc., 1971, 39, 65. [all data]

Van Dijk and Dymanus, 1968
Van Dijk, F.A.; Dymanus, A., Hyperfine structure of the rotational spectrum of HI in the submillimeter region, Chem. Phys. Lett., 1968, 2, 235. [all data]

van Dijk and Dymanus, 1970
van Dijk, F.A.; Dymanus, A., The electric dipole moment of HI and HBr, Chem. Phys. Lett., 1970, 5, 387. [all data]

Chamberlain and Gebbie, 1965
Chamberlain, J.E.; Gebbie, H.A., Sub-millimetre dispersion and rotational line strengths of the hydrogen halides, Nature (London), 1965, 208, 480. [all data]

Notes

Go To: Top, Reaction thermochemistry data, Gas phase ion energetics data, Constants of diatomic molecules, References

Symbols used in this document:

AE	Appearance energy
IE (evaluated)	Recommended ionization energy
T	Temperature
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
The National Institute of Standards and Technology (NIST) uses its best efforts to deliver a high quality copy of the Database and to verify that the data contained therein have been selected on the basis of sound scientific judgment. However, NIST makes no warranties to that effect, and NIST shall not be liable for any damage that may result from errors or omissions in the Database.
Customer support for NIST Standard Reference Data products.