Methane

Formula: CH₄
Molecular weight: 16.0425
IUPAC Standard InChI: InChI=1S/CH4/h1H4
IUPAC Standard InChIKey: VNWKTOKETHGBQD-UHFFFAOYSA-N
CAS Registry Number: 74-82-8
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.
Other names: Marsh gas; Methyl hydride; CH4; Fire Damp; R 50; Biogas; R 50 (refrigerant)
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Information on this page:
Other data available:
- Gas phase thermochemistry data
- Phase change data
- Reaction thermochemistry data: reactions 51 to 100, reactions 101 to 112
- Henry's Law data
- Gas phase ion energetics data
- IR Spectrum
- Vibrational and/or electronic energy levels
- Fluid Properties
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Reaction thermochemistry data

Go To: Top, Ion clustering data, Mass spectrum (electron ionization), References, Notes

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

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.

Reactions 1 to 50

CH₃^- + = Methane

By formula: CH₃^- + H⁺ = CH₄

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	1743.6 ± 2.9	kJ/mol	D-EA	Ellison, Engelking, et al., 1978	gas phase; B
Δ_rH°	1749. ± 15.	kJ/mol	CIDT	Graul and Squires, 1990	gas phase; B
Δ_rH°	>1691.1 ± 0.42	kJ/mol	G+TS	Bohme, Lee-Ruff, et al., 1972	gas phase; B
Δ_rH°	1735.5	kJ/mol	N/A	Check, Faust, et al., 2001	gas phase; FeBr3; ; ΔS(EA)=9.3; B
Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	1709.8 ± 3.3	kJ/mol	H-TS	Ellison, Engelking, et al., 1978	gas phase; B
Δ_rG°	1715. ± 15.	kJ/mol	H-TS	Graul and Squires, 1990	gas phase; B
Δ_rG°	>1657.3	kJ/mol	IMRB	Bohme, Lee-Ruff, et al., 1972	gas phase; B
Δ_rG°	1704.1	kJ/mol	N/A	Check, Faust, et al., 2001	gas phase; FeBr3; ; ΔS(EA)=9.3; B

(CH₅⁺ • Methane ) + Methane = (CH₅⁺ • 2 Methane )

By formula: (CH₅⁺ • CH₄) + CH₄ = (CH₅⁺ • 2CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	22. ± 1.	kJ/mol	PHPMS	Hiraoka and Mori, 1989	gas phase; M
Δ_rH°	25.	kJ/mol	PHPMS	Hiraoka and Kebarle, 1975	gas phase; M
Δ_rH°	6.3	kJ/mol	HPMS	Field and Beggs, 1971	gas phase; Entropy change is questionable; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	104.	J/mol*K	PHPMS	Hiraoka and Mori, 1989	gas phase; M
Δ_rS°	102.	J/mol*K	PHPMS	Hiraoka and Kebarle, 1975	gas phase; M
Δ_rS°	30.	J/mol*K	HPMS	Field and Beggs, 1971	gas phase; Entropy change is questionable; M

CH₅⁺ + Methane = (CH₅⁺ • Methane )

By formula: CH₅⁺ + CH₄ = (CH₅⁺ • CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	29. ± 1.	kJ/mol	PHPMS	Hiraoka and Mori, 1989	gas phase; M
Δ_rH°	31.	kJ/mol	PHPMS	Hiraoka and Kebarle, 1975	gas phase; M
Δ_rH°	17.	kJ/mol	HPMS	Field and Beggs, 1971	gas phase; Entropy change is questionable; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	92.5	J/mol*K	PHPMS	Hiraoka and Mori, 1989	gas phase; M
Δ_rS°	87.0	J/mol*K	PHPMS	Hiraoka and Kebarle, 1975	gas phase; M
Δ_rS°	51.9	J/mol*K	HPMS	Field and Beggs, 1971	gas phase; Entropy change is questionable; M

C₂H₅⁺ + Methane = (C₂H₅⁺ • Methane )

By formula: C₂H₅⁺ + CH₄ = (C₂H₅⁺ • CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	23.0	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Δ_rH°	28.	kJ/mol	PHPMS	Hiroka and Kebarle, 1975	gas phase; M
Δ_rH°	10.	kJ/mol	HPMS	Field and Beggs, 1971	gas phase; Entropy change is questionable; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	92.9	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Δ_rS°	97.9	J/mol*K	PHPMS	Hiroka and Kebarle, 1975	gas phase; M
Δ_rS°	36.	J/mol*K	HPMS	Field and Beggs, 1971	gas phase; Entropy change is questionable; M

( • 2 Methane ) + Methane = ( • 3 Methane )

By formula: (Co⁺ • 2CH₄) + CH₄ = (Co⁺ • 3CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	46.	kJ/mol	SIDT	Kemper, Bushnell, et al., 1993	gas phase; Entropy change calculated or estimated; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	84.	J/mol*K	N/A	Kemper, Bushnell, et al., 1993	gas phase; Entropy change calculated or estimated; M

Enthalpy of reaction

Δ_rH° (kJ/mol)	T (K)	Method	Reference	Comment
41. (+5.0,-0.)		CID	Armentrout and Kickel, 1994	gas phase; guided ion beam CID; M

Free energy of reaction

Δ_rG° (kJ/mol)	T (K)	Method	Reference	Comment
3.	477.	SIDT	Kemper, Bushnell, et al., 1993	gas phase; Entropy change calculated or estimated; M

+ Methane = ( • Methane )

By formula: Co⁺ + CH₄ = (Co⁺ • CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	82.8	J/mol*K	SIDT	Kemper, Bushnell, et al., 1993	gas phase; Δ_rS(530 K); M

Enthalpy of reaction

Δ_rH° (kJ/mol)	Method	Reference	Comment
90.0 (+6.7,-0.)	CID	Haynes and Armentrout, 1996	gas phase; guided ion beam CID; M
90.0 (+5.9,-0.)	CID	Armentrout and Kickel, 1994	gas phase; guided ion beam CID; M
94. (+2.,-0.)	SIDT	Kemper, Bushnell, et al., 1993	gas phase; Δ_rS(530 K); M

( • Methane ) + = ( • • Methane )

By formula: (Co⁺ • CH₄) + H₂ = (Co⁺ • H₂ • CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	95.8	J/mol*K	SIDT	Kemper, Bushnell, et al., 1993	gas phase; switching reaction(Co+).2H2, Δ_rS(440 K); Kemper, Bushnell, et al., 1993, 2; M

Enthalpy of reaction

Δ_rH° (kJ/mol)	T (K)	Method	Reference	Comment
73. (+3.,-0.)		SIDT	Kemper, Bushnell, et al., 1993	gas phase; switching reaction(Co+).2H2, Δ_rS(440 K); Kemper, Bushnell, et al., 1993, 2; M

( • ) + Methane = ( • Methane • )

By formula: (Co⁺ • H₂) + CH₄ = (Co⁺ • CH₄ • H₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	91.2	J/mol*K	SIDT	Kemper, Bushnell, et al., 1993	gas phase; switching reaction(Co+)2H2, Δ_rS(440 K); Kemper, Bushnell, et al., 1993, 2; M

Enthalpy of reaction

Δ_rH° (kJ/mol)	T (K)	Method	Reference	Comment
94.6 (+5.0,-0.)		SIDT	Kemper, Bushnell, et al., 1993	gas phase; switching reaction(Co+)2H2, Δ_rS(440 K); Kemper, Bushnell, et al., 1993, 2; M

(g) = C₅MnO₅ (g) + Methane (g)

By formula: C₆H₃MnO₅ (g) = C₅MnO₅ (g) + CH₄ (g)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	192. ± 15.	kJ/mol	PIMS	Martinho Simões and Beauchamp, 1990	The reaction enthalpy was derived from the appearance energy of Mn(CO)5(+), 940.7 ± 4.8 kJ/mol, using Mn(CO)5(Me) as the neutral precursor, together with the adiabatic ionization energy of Mn(CO)5 radical, 749. ± 14. kJ/mol Martinho Simões and Beauchamp, 1990; MS

( • Methane ) + Methane = ( • 2 Methane )

By formula: (Co⁺ • CH₄) + CH₄ = (Co⁺ • 2CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	109.	J/mol*K	SIDT	Kemper, Bushnell, et al., 1993	gas phase; Δ_rS(500 K); M

Enthalpy of reaction

Δ_rH° (kJ/mol)	T (K)	Method	Reference	Comment
95.8 (+5.0,-0.)		CID	Armentrout and Kickel, 1994	gas phase; guided ion beam CID; M
104. (+4.2,-0.)		SIDT	Kemper, Bushnell, et al., 1993	gas phase; Δ_rS(500 K); M

(CH₅⁺ • 2 Methane ) + Methane = (CH₅⁺ • 3 Methane )

By formula: (CH₅⁺ • 2CH₄) + CH₄ = (CH₅⁺ • 3CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	13.1 ± 0.8	kJ/mol	PHPMS	Hiraoka and Mori, 1989	gas phase; M
Δ_rH°	17.	kJ/mol	PHPMS	Hiraoka and Kebarle, 1975	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	93.7	J/mol*K	PHPMS	Hiraoka and Mori, 1989	gas phase; M
Δ_rS°	109.	J/mol*K	PHPMS	Hiraoka and Kebarle, 1975	gas phase; M

(CH₅⁺ • 3 Methane ) + Methane = (CH₅⁺ • 4 Methane )

By formula: (CH₅⁺ • 3CH₄) + CH₄ = (CH₅⁺ • 4CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	12.6 ± 0.8	kJ/mol	PHPMS	Hiraoka and Mori, 1989	gas phase; M
Δ_rH°	16.	kJ/mol	PHPMS	Hiraoka and Kebarle, 1975	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	99.2	J/mol*K	PHPMS	Hiraoka and Mori, 1989	gas phase; M
Δ_rS°	111.	J/mol*K	PHPMS	Hiraoka and Kebarle, 1975	gas phase; M

(g) + CH₃BrMg (solution) = Methane (solution) + Br₂Mg (solution)

By formula: HBr (g) + CH₃BrMg (solution) = CH₄ (solution) + Br₂Mg (solution)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-274.5 ± 2.2	kJ/mol	RSC	Holm, 1981	solvent: Diethyl ether; The enthalpy of formation was calculated using the assumptions and the auxiliary data in Holm, 1981, except for the organic compound, whose enthalpy of formation was quoted from Pedley, 1994; MS

( • Methane ) + = ( • • Methane )

By formula: (Co⁺ • CH₄) + C₂H₆ = (Co⁺ • C₂H₆ • CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	108.	J/mol*K	SIDT	Kemper, Bushnell, et al., 1993	gas phase; switching reaction(Co+).2CH4, Δ_rS(480 K); M

Enthalpy of reaction

Δ_rH° (kJ/mol)	T (K)	Method	Reference	Comment
119. (+5.4,-0.)		SIDT	Kemper, Bushnell, et al., 1993	gas phase; switching reaction(Co+).2CH4, Δ_rS(480 K); M

C₆₃H₉₁CoN₁₃O₁₄P (solution) = (solution) + Methane (solution)

By formula: C₆₃H₉₁CoN₁₃O₁₄P (solution) = C₆₃H₈₈CoN₁₄O₁₄P (solution) + CH₄ (solution)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	155. ± 13.	kJ/mol	KinS	Martin and Finke, 1990	solvent: Ethylene glycol; Please also see Martin and Finke, 1992. The reaction enthalpy relies on 172. ± 13. kJ/mol for the reaction activation enthalpy. The reaction refers to "base-on" cobalamine.; MS

C₃H₇⁺ + Methane = (C₃H₇⁺ • Methane )

By formula: C₃H₇⁺ + CH₄ = (C₃H₇⁺ • CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	10.8	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Δ_rH°	14.	kJ/mol	PHPMS	Hiraoka and Kebarle, 1976	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	72.8	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Δ_rS°	84.	J/mol*K	PHPMS	Hiraoka and Kebarle, 1976	gas phase; M

+ = Methane +

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

(C₂H₅⁺ • 9 Methane ) + Methane = (C₂H₅⁺ • 10 Methane )

By formula: (C₂H₅⁺ • 9CH₄) + CH₄ = (C₂H₅⁺ • 10CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	7.99	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; Entropy change calculated or estimated; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	92.	J/mol*K	N/A	Hiraoka, Mori, et al., 1993	gas phase; Entropy change calculated or estimated; M

(C₃H₇⁺ • 7 Methane ) + Methane = (C₃H₇⁺ • 8 Methane )

By formula: (C₃H₇⁺ • 7CH₄) + CH₄ = (C₃H₇⁺ • 8CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	8.28	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; Entropy change calculated or estimated; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	92.	J/mol*K	N/A	Hiraoka, Mori, et al., 1993	gas phase; Entropy change calculated or estimated; M

(C₄H₉⁺ • 8 Methane ) + Methane = (C₄H₉⁺ • 9 Methane )

By formula: (C₄H₉⁺ • 8CH₄) + CH₄ = (C₄H₉⁺ • 9CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	7.78	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; Entropy change calculated or estimated; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	84.	J/mol*K	N/A	Hiraoka, Mori, et al., 1993	gas phase; Entropy change calculated or estimated; M

(CH₅⁺ • 8 Methane ) + Methane = (CH₅⁺ • 9 Methane )

By formula: (CH₅⁺ • 8CH₄) + CH₄ = (CH₅⁺ • 9CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	6.44	kJ/mol	PHPMS	Hiraoka and Mori, 1989	gas phase; Entropy change calculated or estimated; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	84.	J/mol*K	N/A	Hiraoka and Mori, 1989	gas phase; Entropy change calculated or estimated; M

( • ) + Methane = ( • Methane • )

By formula: (Co⁺ • H₂O) + CH₄ = (Co⁺ • CH₄ • H₂O)

Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	113.	J/mol*K	SIDT	Kemper, Bushnell, et al., 1993	gas phase; Δ_rS(525 K); M

Enthalpy of reaction

Δ_rH° (kJ/mol)	T (K)	Method	Reference	Comment
108. (+3.,-0.)		SIDT	Kemper, Bushnell, et al., 1993	gas phase; Δ_rS(525 K); M

( • Methane ) + Methane = ( • 2 Methane )

By formula: (H₃O⁺ • CH₄) + CH₄ = (H₃O⁺ • 2CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	14.	kJ/mol	HPMS	Bennet and Field, 1972	gas phase; Entropy change is questionable; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	34.	J/mol*K	HPMS	Bennet and Field, 1972	gas phase; Entropy change is questionable; M

( • ) + Methane = ( • Methane • )

By formula: (Co⁺ • C₂H₆) + CH₄ = (Co⁺ • CH₄ • C₂H₆)

Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	110.	J/mol*K	SIDT	Kemper, Bushnell, et al., 1993	gas phase; Δ_rS(490 K); M

Enthalpy of reaction

Δ_rH° (kJ/mol)	T (K)	Method	Reference	Comment
102. (+4.6,-0.)		SIDT	Kemper, Bushnell, et al., 1993	gas phase; Δ_rS(490 K); M

+ Methane = ( • Methane )

By formula: H₄N⁺ + CH₄ = (H₄N⁺ • CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	15.	kJ/mol	HPMS	Bennet and Field, 1972, 2	gas phase; Entropy change is questionable; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	64.9	J/mol*K	HPMS	Bennet and Field, 1972, 2	gas phase; Entropy change is questionable; M

(g) + (cr) = Methane (g) + (cr)

By formula: HBr (g) + CH₃Li (cr) = CH₄ (g) + BrLi (cr)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-317.3 ± 2.0	kJ/mol	RSC	Holm, 1974	Please also see Pedley and Rylance, 1977. The reaction enthalpy was quoted from Pedley and Rylance, 1977. See Liebman, Martinho Simões, et al., 1995 for comments; MS

2 + = Methane + 2

By formula: 2H₂ + CH₂Cl₂ = CH₄ + 2HCl

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-163.4 ± 1.3	kJ/mol	Chyd	Lacher, Amador, et al., 1967	gas phase; Reanalyzed by Cox and Pilcher, 1970, Original value = -167.7 ± 1.3 kJ/mol; At 250 C; ALS

(l) + ( • 100) (solution) = 2 Methane (g) + ( • 100) (solution)

By formula: C₂H₆Zn (l) + (H₂O₄S • 100H₂O) (solution) = 2CH₄ (g) + (O₄SZn • 100H₂O) (solution)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-341.8 ± 0.8	kJ/mol	RSC	Carson, Hartley, et al., 1949	Please also see Pedley and Rylance, 1977 and Cox and Pilcher, 1970, 2.; MS

(CH₅⁺ • 4 Methane ) + Methane = (CH₅⁺ • 5 Methane )

By formula: (CH₅⁺ • 4CH₄) + CH₄ = (CH₅⁺ • 5CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	11.7 ± 0.8	kJ/mol	PHPMS	Hiraoka and Mori, 1989	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	104.	J/mol*K	PHPMS	Hiraoka and Mori, 1989	gas phase; M

(CH₅⁺ • 5 Methane ) + Methane = (CH₅⁺ • 6 Methane )

By formula: (CH₅⁺ • 5CH₄) + CH₄ = (CH₅⁺ • 6CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	11.3 ± 0.8	kJ/mol	PHPMS	Hiraoka and Mori, 1989	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	106.	J/mol*K	PHPMS	Hiraoka and Mori, 1989	gas phase; M

(CH₅⁺ • 6 Methane ) + Methane = (CH₅⁺ • 7 Methane )

By formula: (CH₅⁺ • 6CH₄) + CH₄ = (CH₅⁺ • 7CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	11.2 ± 0.8	kJ/mol	PHPMS	Hiraoka and Mori, 1989	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	111.	J/mol*K	PHPMS	Hiraoka and Mori, 1989	gas phase; M

(CH₅⁺ • 7 Methane ) + Methane = (CH₅⁺ • 8 Methane )

By formula: (CH₅⁺ • 7CH₄) + CH₄ = (CH₅⁺ • 8CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	8.5 ± 0.8	kJ/mol	PHPMS	Hiraoka and Mori, 1989	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	90.4	J/mol*K	PHPMS	Hiraoka and Mori, 1989	gas phase; M

(C₂H₅⁺ • 2 Methane ) + Methane = (C₂H₅⁺ • 3 Methane )

By formula: (C₂H₅⁺ • 2CH₄) + CH₄ = (C₂H₅⁺ • 3CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	9.54	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	74.9	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M

(C₂H₅⁺ • 3 Methane ) + Methane = (C₂H₅⁺ • 4 Methane )

By formula: (C₂H₅⁺ • 3CH₄) + CH₄ = (C₂H₅⁺ • 4CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	9.46	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	77.0	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M

(C₂H₅⁺ • 4 Methane ) + Methane = (C₂H₅⁺ • 5 Methane )

By formula: (C₂H₅⁺ • 4CH₄) + CH₄ = (C₂H₅⁺ • 5CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	9.29	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	79.1	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M

(C₂H₅⁺ • 5 Methane ) + Methane = (C₂H₅⁺ • 6 Methane )

By formula: (C₂H₅⁺ • 5CH₄) + CH₄ = (C₂H₅⁺ • 6CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	9.25	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	81.2	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M

(C₂H₅⁺ • 6 Methane ) + Methane = (C₂H₅⁺ • 7 Methane )

By formula: (C₂H₅⁺ • 6CH₄) + CH₄ = (C₂H₅⁺ • 7CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	8.91	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	86.6	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M

(C₂H₅⁺ • 7 Methane ) + Methane = (C₂H₅⁺ • 8 Methane )

By formula: (C₂H₅⁺ • 7CH₄) + CH₄ = (C₂H₅⁺ • 8CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	8.79	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	87.9	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M

(C₂H₅⁺ • 8 Methane ) + Methane = (C₂H₅⁺ • 9 Methane )

By formula: (C₂H₅⁺ • 8CH₄) + CH₄ = (C₂H₅⁺ • 9CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	8.70	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	91.2	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M

(C₃H₇⁺ • 2 Methane ) + Methane = (C₃H₇⁺ • 3 Methane )

By formula: (C₃H₇⁺ • 2CH₄) + CH₄ = (C₃H₇⁺ • 3CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	9.46	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	77.0	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M

(C₃H₇⁺ • 3 Methane ) + Methane = (C₃H₇⁺ • 4 Methane )

By formula: (C₃H₇⁺ • 3CH₄) + CH₄ = (C₃H₇⁺ • 4CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	9.20	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	79.5	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M

(C₃H₇⁺ • 4 Methane ) + Methane = (C₃H₇⁺ • 5 Methane )

By formula: (C₃H₇⁺ • 4CH₄) + CH₄ = (C₃H₇⁺ • 5CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	9.20	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	87.4	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M

(C₃H₇⁺ • 5 Methane ) + Methane = (C₃H₇⁺ • 6 Methane )

By formula: (C₃H₇⁺ • 5CH₄) + CH₄ = (C₃H₇⁺ • 6CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	9.16	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	87.9	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M

(C₃H₇⁺ • 6 Methane ) + Methane = (C₃H₇⁺ • 7 Methane )

By formula: (C₃H₇⁺ • 6CH₄) + CH₄ = (C₃H₇⁺ • 7CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	9.04	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	91.2	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M

(C₄H₉⁺ • 2 Methane ) + Methane = (C₄H₉⁺ • 3 Methane )

By formula: (C₄H₉⁺ • 2CH₄) + CH₄ = (C₄H₉⁺ • 3CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	9.92	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	82.4	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M

(C₄H₉⁺ • 3 Methane ) + Methane = (C₄H₉⁺ • 4 Methane )

By formula: (C₄H₉⁺ • 3CH₄) + CH₄ = (C₄H₉⁺ • 4CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	9.87	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	83.7	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M

(C₄H₉⁺ • 4 Methane ) + Methane = (C₄H₉⁺ • 5 Methane )

By formula: (C₄H₉⁺ • 4CH₄) + CH₄ = (C₄H₉⁺ • 5CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	9.25	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	81.2	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M

(C₄H₉⁺ • 5 Methane ) + Methane = (C₄H₉⁺ • 6 Methane )

By formula: (C₄H₉⁺ • 5CH₄) + CH₄ = (C₄H₉⁺ • 6CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	8.74	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	80.8	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M

(C₄H₉⁺ • 6 Methane ) + Methane = (C₄H₉⁺ • 7 Methane )

By formula: (C₄H₉⁺ • 6CH₄) + CH₄ = (C₄H₉⁺ • 7CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	8.58	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	82.4	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M

(C₄H₉⁺ • 7 Methane ) + Methane = (C₄H₉⁺ • 8 Methane )

By formula: (C₄H₉⁺ • 7CH₄) + CH₄ = (C₄H₉⁺ • 8CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	8.33	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	84.1	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M

Ion clustering data

Go To: Top, Reaction thermochemistry data, Mass spectrum (electron ionization), References, Notes

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

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

+ Methane = CH₄Br^-

By formula: Br^- + CH₄ = CH₄Br^-

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	13.0	kJ/mol	N/A	Hiraoka, Mizuno, et al., 2001	gas phase; B
Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	-9.50	kJ/mol	TDAs	Hiraoka, Mizuno, et al., 2001	gas phase; B

+ Methane = ( • Methane )

By formula: CF₃⁺ + CH₄ = (CF₃⁺ • CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	19.	kJ/mol	HPMS	Bennet and Field, 1972, 2	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	78.7	J/mol*K	HPMS	Bennet and Field, 1972, 2	gas phase; M

CH₄Cl^- + 2 Methane = C₂H₈Cl^-

By formula: CH₄Cl^- + 2CH₄ = C₂H₈Cl^-

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	14.6	kJ/mol	N/A	Hiraoka, Mizuno, et al., 2001	gas phase; B
Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	-12.8	kJ/mol	TDAs	Hiraoka, Mizuno, et al., 2001	gas phase; B

CH₄F^- + 2 Methane = C₂H₈F^-

By formula: CH₄F^- + 2CH₄ = C₂H₈F^-

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	24.7	kJ/mol	N/A	Hiraoka, Mizuno, et al., 2001	gas phase; B
Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	-1.5	kJ/mol	TDAs	Hiraoka, Mizuno, et al., 2001	gas phase; B

CH₅⁺ + Methane = (CH₅⁺ • Methane )

By formula: CH₅⁺ + CH₄ = (CH₅⁺ • CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	29. ± 1.	kJ/mol	PHPMS	Hiraoka and Mori, 1989	gas phase; M
Δ_rH°	31.	kJ/mol	PHPMS	Hiraoka and Kebarle, 1975	gas phase; M
Δ_rH°	17.	kJ/mol	HPMS	Field and Beggs, 1971	gas phase; Entropy change is questionable; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	92.5	J/mol*K	PHPMS	Hiraoka and Mori, 1989	gas phase; M
Δ_rS°	87.0	J/mol*K	PHPMS	Hiraoka and Kebarle, 1975	gas phase; M
Δ_rS°	51.9	J/mol*K	HPMS	Field and Beggs, 1971	gas phase; Entropy change is questionable; M

(CH₅⁺ • Methane ) + Methane = (CH₅⁺ • 2 Methane )

By formula: (CH₅⁺ • CH₄) + CH₄ = (CH₅⁺ • 2CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	22. ± 1.	kJ/mol	PHPMS	Hiraoka and Mori, 1989	gas phase; M
Δ_rH°	25.	kJ/mol	PHPMS	Hiraoka and Kebarle, 1975	gas phase; M
Δ_rH°	6.3	kJ/mol	HPMS	Field and Beggs, 1971	gas phase; Entropy change is questionable; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	104.	J/mol*K	PHPMS	Hiraoka and Mori, 1989	gas phase; M
Δ_rS°	102.	J/mol*K	PHPMS	Hiraoka and Kebarle, 1975	gas phase; M
Δ_rS°	30.	J/mol*K	HPMS	Field and Beggs, 1971	gas phase; Entropy change is questionable; M

(CH₅⁺ • 2 Methane ) + Methane = (CH₅⁺ • 3 Methane )

By formula: (CH₅⁺ • 2CH₄) + CH₄ = (CH₅⁺ • 3CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	13.1 ± 0.8	kJ/mol	PHPMS	Hiraoka and Mori, 1989	gas phase; M
Δ_rH°	17.	kJ/mol	PHPMS	Hiraoka and Kebarle, 1975	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	93.7	J/mol*K	PHPMS	Hiraoka and Mori, 1989	gas phase; M
Δ_rS°	109.	J/mol*K	PHPMS	Hiraoka and Kebarle, 1975	gas phase; M

(CH₅⁺ • 3 Methane ) + Methane = (CH₅⁺ • 4 Methane )

By formula: (CH₅⁺ • 3CH₄) + CH₄ = (CH₅⁺ • 4CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	12.6 ± 0.8	kJ/mol	PHPMS	Hiraoka and Mori, 1989	gas phase; M
Δ_rH°	16.	kJ/mol	PHPMS	Hiraoka and Kebarle, 1975	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	99.2	J/mol*K	PHPMS	Hiraoka and Mori, 1989	gas phase; M
Δ_rS°	111.	J/mol*K	PHPMS	Hiraoka and Kebarle, 1975	gas phase; M

(CH₅⁺ • 4 Methane ) + Methane = (CH₅⁺ • 5 Methane )

By formula: (CH₅⁺ • 4CH₄) + CH₄ = (CH₅⁺ • 5CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	11.7 ± 0.8	kJ/mol	PHPMS	Hiraoka and Mori, 1989	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	104.	J/mol*K	PHPMS	Hiraoka and Mori, 1989	gas phase; M

(CH₅⁺ • 5 Methane ) + Methane = (CH₅⁺ • 6 Methane )

By formula: (CH₅⁺ • 5CH₄) + CH₄ = (CH₅⁺ • 6CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	11.3 ± 0.8	kJ/mol	PHPMS	Hiraoka and Mori, 1989	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	106.	J/mol*K	PHPMS	Hiraoka and Mori, 1989	gas phase; M

(CH₅⁺ • 6 Methane ) + Methane = (CH₅⁺ • 7 Methane )

By formula: (CH₅⁺ • 6CH₄) + CH₄ = (CH₅⁺ • 7CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	11.2 ± 0.8	kJ/mol	PHPMS	Hiraoka and Mori, 1989	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	111.	J/mol*K	PHPMS	Hiraoka and Mori, 1989	gas phase; M

(CH₅⁺ • 7 Methane ) + Methane = (CH₅⁺ • 8 Methane )

By formula: (CH₅⁺ • 7CH₄) + CH₄ = (CH₅⁺ • 8CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	8.5 ± 0.8	kJ/mol	PHPMS	Hiraoka and Mori, 1989	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	90.4	J/mol*K	PHPMS	Hiraoka and Mori, 1989	gas phase; M

(CH₅⁺ • 8 Methane ) + Methane = (CH₅⁺ • 9 Methane )

By formula: (CH₅⁺ • 8CH₄) + CH₄ = (CH₅⁺ • 9CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	6.44	kJ/mol	PHPMS	Hiraoka and Mori, 1989	gas phase; Entropy change calculated or estimated; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	84.	J/mol*K	N/A	Hiraoka and Mori, 1989	gas phase; Entropy change calculated or estimated; M

C₂H₅⁺ + Methane = (C₂H₅⁺ • Methane )

By formula: C₂H₅⁺ + CH₄ = (C₂H₅⁺ • CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	23.0	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Δ_rH°	28.	kJ/mol	PHPMS	Hiroka and Kebarle, 1975	gas phase; M
Δ_rH°	10.	kJ/mol	HPMS	Field and Beggs, 1971	gas phase; Entropy change is questionable; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	92.9	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Δ_rS°	97.9	J/mol*K	PHPMS	Hiroka and Kebarle, 1975	gas phase; M
Δ_rS°	36.	J/mol*K	HPMS	Field and Beggs, 1971	gas phase; Entropy change is questionable; M

(C₂H₅⁺ • Methane ) + Methane = (C₂H₅⁺ • 2 Methane )

By formula: (C₂H₅⁺ • CH₄) + CH₄ = (C₂H₅⁺ • 2CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	9.92	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	67.4	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M

(C₂H₅⁺ • 2 Methane ) + Methane = (C₂H₅⁺ • 3 Methane )

By formula: (C₂H₅⁺ • 2CH₄) + CH₄ = (C₂H₅⁺ • 3CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	9.54	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	74.9	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M

(C₂H₅⁺ • 3 Methane ) + Methane = (C₂H₅⁺ • 4 Methane )

By formula: (C₂H₅⁺ • 3CH₄) + CH₄ = (C₂H₅⁺ • 4CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	9.46	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	77.0	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M

(C₂H₅⁺ • 4 Methane ) + Methane = (C₂H₅⁺ • 5 Methane )

By formula: (C₂H₅⁺ • 4CH₄) + CH₄ = (C₂H₅⁺ • 5CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	9.29	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	79.1	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M

(C₂H₅⁺ • 5 Methane ) + Methane = (C₂H₅⁺ • 6 Methane )

By formula: (C₂H₅⁺ • 5CH₄) + CH₄ = (C₂H₅⁺ • 6CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	9.25	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	81.2	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M

(C₂H₅⁺ • 6 Methane ) + Methane = (C₂H₅⁺ • 7 Methane )

By formula: (C₂H₅⁺ • 6CH₄) + CH₄ = (C₂H₅⁺ • 7CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	8.91	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	86.6	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M

(C₂H₅⁺ • 7 Methane ) + Methane = (C₂H₅⁺ • 8 Methane )

By formula: (C₂H₅⁺ • 7CH₄) + CH₄ = (C₂H₅⁺ • 8CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	8.79	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	87.9	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M

(C₂H₅⁺ • 8 Methane ) + Methane = (C₂H₅⁺ • 9 Methane )

By formula: (C₂H₅⁺ • 8CH₄) + CH₄ = (C₂H₅⁺ • 9CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	8.70	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	91.2	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M

(C₂H₅⁺ • 9 Methane ) + Methane = (C₂H₅⁺ • 10 Methane )

By formula: (C₂H₅⁺ • 9CH₄) + CH₄ = (C₂H₅⁺ • 10CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	7.99	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; Entropy change calculated or estimated; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	92.	J/mol*K	N/A	Hiraoka, Mori, et al., 1993	gas phase; Entropy change calculated or estimated; M

C₂H₈F^- + 3 Methane = C₃H₁₂F^-

By formula: C₂H₈F^- + 3CH₄ = C₃H₁₂F^-

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	23.0	kJ/mol	N/A	Hiraoka, Mizuno, et al., 2001	gas phase; B
Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	-5.69	kJ/mol	TDAs	Hiraoka, Mizuno, et al., 2001	gas phase; B

C₃H₇⁺ + Methane = (C₃H₇⁺ • Methane )

By formula: C₃H₇⁺ + CH₄ = (C₃H₇⁺ • CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	10.8	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Δ_rH°	14.	kJ/mol	PHPMS	Hiraoka and Kebarle, 1976	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	72.8	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Δ_rS°	84.	J/mol*K	PHPMS	Hiraoka and Kebarle, 1976	gas phase; M

(C₃H₇⁺ • Methane ) + Methane = (C₃H₇⁺ • 2 Methane )

By formula: (C₃H₇⁺ • CH₄) + CH₄ = (C₃H₇⁺ • 2CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	10.3	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	79.5	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M

(C₃H₇⁺ • 2 Methane ) + Methane = (C₃H₇⁺ • 3 Methane )

By formula: (C₃H₇⁺ • 2CH₄) + CH₄ = (C₃H₇⁺ • 3CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	9.46	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	77.0	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M

(C₃H₇⁺ • 3 Methane ) + Methane = (C₃H₇⁺ • 4 Methane )

By formula: (C₃H₇⁺ • 3CH₄) + CH₄ = (C₃H₇⁺ • 4CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	9.20	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	79.5	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M

(C₃H₇⁺ • 4 Methane ) + Methane = (C₃H₇⁺ • 5 Methane )

By formula: (C₃H₇⁺ • 4CH₄) + CH₄ = (C₃H₇⁺ • 5CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	9.20	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	87.4	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M

(C₃H₇⁺ • 5 Methane ) + Methane = (C₃H₇⁺ • 6 Methane )

By formula: (C₃H₇⁺ • 5CH₄) + CH₄ = (C₃H₇⁺ • 6CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	9.16	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	87.9	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M

(C₃H₇⁺ • 6 Methane ) + Methane = (C₃H₇⁺ • 7 Methane )

By formula: (C₃H₇⁺ • 6CH₄) + CH₄ = (C₃H₇⁺ • 7CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	9.04	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	91.2	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M

(C₃H₇⁺ • 7 Methane ) + Methane = (C₃H₇⁺ • 8 Methane )

By formula: (C₃H₇⁺ • 7CH₄) + CH₄ = (C₃H₇⁺ • 8CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	8.28	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; Entropy change calculated or estimated; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	92.	J/mol*K	N/A	Hiraoka, Mori, et al., 1993	gas phase; Entropy change calculated or estimated; M

C₃H₁₂F^- + 4 Methane = C₄H₁₆F^-

By formula: C₃H₁₂F^- + 4CH₄ = C₄H₁₆F^-

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	20.9	kJ/mol	N/A	Hiraoka, Mizuno, et al., 2001	gas phase; B
Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	-9.04	kJ/mol	TDAs	Hiraoka, Mizuno, et al., 2001	gas phase; B

C₄H₉⁺ + Methane = (C₄H₉⁺ • Methane )

By formula: C₄H₉⁺ + CH₄ = (C₄H₉⁺ • CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	10.4	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	81.6	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M

(C₄H₉⁺ • Methane ) + Methane = (C₄H₉⁺ • 2 Methane )

By formula: (C₄H₉⁺ • CH₄) + CH₄ = (C₄H₉⁺ • 2CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	10.0	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	81.2	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M

(C₄H₉⁺ • 2 Methane ) + Methane = (C₄H₉⁺ • 3 Methane )

By formula: (C₄H₉⁺ • 2CH₄) + CH₄ = (C₄H₉⁺ • 3CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	9.92	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	82.4	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M

(C₄H₉⁺ • 3 Methane ) + Methane = (C₄H₉⁺ • 4 Methane )

By formula: (C₄H₉⁺ • 3CH₄) + CH₄ = (C₄H₉⁺ • 4CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	9.87	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	83.7	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M

(C₄H₉⁺ • 4 Methane ) + Methane = (C₄H₉⁺ • 5 Methane )

By formula: (C₄H₉⁺ • 4CH₄) + CH₄ = (C₄H₉⁺ • 5CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	9.25	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	81.2	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M

(C₄H₉⁺ • 5 Methane ) + Methane = (C₄H₉⁺ • 6 Methane )

By formula: (C₄H₉⁺ • 5CH₄) + CH₄ = (C₄H₉⁺ • 6CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	8.74	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	80.8	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M

(C₄H₉⁺ • 6 Methane ) + Methane = (C₄H₉⁺ • 7 Methane )

By formula: (C₄H₉⁺ • 6CH₄) + CH₄ = (C₄H₉⁺ • 7CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	8.58	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	82.4	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M

(C₄H₉⁺ • 7 Methane ) + Methane = (C₄H₉⁺ • 8 Methane )

By formula: (C₄H₉⁺ • 7CH₄) + CH₄ = (C₄H₉⁺ • 8CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	8.33	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	84.1	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; M

(C₄H₉⁺ • 8 Methane ) + Methane = (C₄H₉⁺ • 9 Methane )

By formula: (C₄H₉⁺ • 8CH₄) + CH₄ = (C₄H₉⁺ • 9CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	7.78	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1993	gas phase; Entropy change calculated or estimated; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	84.	J/mol*K	N/A	Hiraoka, Mori, et al., 1993	gas phase; Entropy change calculated or estimated; M

C₄H₁₆F^- + 5 Methane = C₅H₂₀F^-

By formula: C₄H₁₆F^- + 5CH₄ = C₅H₂₀F^-

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	18.8	kJ/mol	N/A	Hiraoka, Mizuno, et al., 2001	gas phase; B
Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	-12.3	kJ/mol	TDAs	Hiraoka, Mizuno, et al., 2001	gas phase; B

C₅H₂₀F^- + 6 Methane = C₆H₂₄F^-

By formula: C₅H₂₀F^- + 6CH₄ = C₆H₂₄F^-

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	17.6	kJ/mol	N/A	Hiraoka, Mizuno, et al., 2001	gas phase; B
Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	-13.6	kJ/mol	TDAs	Hiraoka, Mizuno, et al., 2001	gas phase; B

C₅MnO₅⁺ + Methane = (C₅MnO₅⁺ • Methane )

By formula: C₅MnO₅⁺ + CH₄ = (C₅MnO₅⁺ • CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	30.	kJ/mol	ICRCD	Hop and McMahon, 1991	gas phase; Ar collision gas, Δ_rH<; M

C₆H₂₄F^- + 7 Methane = C₇H₂₈F^-

By formula: C₆H₂₄F^- + 7CH₄ = C₇H₂₈F^-

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	13.8	kJ/mol	N/A	Hiraoka, Mizuno, et al., 2001	gas phase; B
Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	-12.4	kJ/mol	TDAs	Hiraoka, Mizuno, et al., 2001	gas phase; B

C₇H₂₈F^- + 8 Methane = C₈H₃₂F^-

By formula: C₇H₂₈F^- + 8CH₄ = C₈H₃₂F^-

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	12.1	kJ/mol	N/A	Hiraoka, Mizuno, et al., 2001	gas phase; B
Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	-15.3	kJ/mol	TDAs	Hiraoka, Mizuno, et al., 2001	gas phase; B

C₈H₃₂F^- + 9 Methane = C₉H₃₆F^-

By formula: C₈H₃₂F^- + 9CH₄ = C₉H₃₆F^-

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	9.62	kJ/mol	N/A	Hiraoka, Mizuno, et al., 2001	gas phase; B
Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	-16.6	kJ/mol	TDAs	Hiraoka, Mizuno, et al., 2001	gas phase; B

C₉H₃₆F^- + 10 Methane = C₁₀H₄₀F^-

By formula: C₉H₃₆F^- + 10CH₄ = C₁₀H₄₀F^-

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	7.53	kJ/mol	N/A	Hiraoka, Mizuno, et al., 2001	gas phase; B
Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	-17.4	kJ/mol	TDAs	Hiraoka, Mizuno, et al., 2001	gas phase; B

+ Methane = CH₄Cl^-

By formula: Cl^- + CH₄ = CH₄Cl^-

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	15.9	kJ/mol	N/A	Hiraoka, Mizuno, et al., 2001	gas phase; B
Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	-9.04	kJ/mol	TDAs	Hiraoka, Mizuno, et al., 2001	gas phase; B

+ Methane = ( • Methane )

By formula: Co⁺ + CH₄ = (Co⁺ • CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	82.8	J/mol*K	SIDT	Kemper, Bushnell, et al., 1993	gas phase; Δ_rS(530 K); M

Enthalpy of reaction

Δ_rH° (kJ/mol)	Method	Reference	Comment
90.0 (+6.7,-0.)	CID	Haynes and Armentrout, 1996	gas phase; guided ion beam CID; M
90.0 (+5.9,-0.)	CID	Armentrout and Kickel, 1994	gas phase; guided ion beam CID; M
94. (+2.,-0.)	SIDT	Kemper, Bushnell, et al., 1993	gas phase; Δ_rS(530 K); M

( • Methane ) + Methane = ( • 2 Methane )

By formula: (Co⁺ • CH₄) + CH₄ = (Co⁺ • 2CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	109.	J/mol*K	SIDT	Kemper, Bushnell, et al., 1993	gas phase; Δ_rS(500 K); M

Enthalpy of reaction

Δ_rH° (kJ/mol)	T (K)	Method	Reference	Comment
95.8 (+5.0,-0.)		CID	Armentrout and Kickel, 1994	gas phase; guided ion beam CID; M
104. (+4.2,-0.)		SIDT	Kemper, Bushnell, et al., 1993	gas phase; Δ_rS(500 K); M

( • 2 Methane ) + Methane = ( • 3 Methane )

By formula: (Co⁺ • 2CH₄) + CH₄ = (Co⁺ • 3CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	46.	kJ/mol	SIDT	Kemper, Bushnell, et al., 1993	gas phase; Entropy change calculated or estimated; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	84.	J/mol*K	N/A	Kemper, Bushnell, et al., 1993	gas phase; Entropy change calculated or estimated; M

Enthalpy of reaction

Δ_rH° (kJ/mol)	T (K)	Method	Reference	Comment
41. (+5.0,-0.)		CID	Armentrout and Kickel, 1994	gas phase; guided ion beam CID; M

Free energy of reaction

Δ_rG° (kJ/mol)	T (K)	Method	Reference	Comment
3.	477.	SIDT	Kemper, Bushnell, et al., 1993	gas phase; Entropy change calculated or estimated; M

( • 3 Methane ) + Methane = ( • 4 Methane )

By formula: (Co⁺ • 3CH₄) + CH₄ = (Co⁺ • 4CH₄)

Enthalpy of reaction

Δ_rH° (kJ/mol)	T (K)	Method	Reference	Comment
67.8 (+5.9,-0.)		CID	Armentrout and Kickel, 1994	gas phase; guided ion beam CID; M

( • ) + Methane = ( • Methane • )

By formula: (Co⁺ • C₂H₆) + CH₄ = (Co⁺ • CH₄ • C₂H₆)

Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	110.	J/mol*K	SIDT	Kemper, Bushnell, et al., 1993	gas phase; Δ_rS(490 K); M

Enthalpy of reaction

Δ_rH° (kJ/mol)	T (K)	Method	Reference	Comment
102. (+4.6,-0.)		SIDT	Kemper, Bushnell, et al., 1993	gas phase; Δ_rS(490 K); M

( • ) + Methane = ( • Methane • )

By formula: (Co⁺ • H₂O) + CH₄ = (Co⁺ • CH₄ • H₂O)

Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	113.	J/mol*K	SIDT	Kemper, Bushnell, et al., 1993	gas phase; Δ_rS(525 K); M

Enthalpy of reaction

Δ_rH° (kJ/mol)	T (K)	Method	Reference	Comment
108. (+3.,-0.)		SIDT	Kemper, Bushnell, et al., 1993	gas phase; Δ_rS(525 K); M

( • ) + Methane = ( • Methane • )

By formula: (Co⁺ • H₂) + CH₄ = (Co⁺ • CH₄ • H₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	91.2	J/mol*K	SIDT	Kemper, Bushnell, et al., 1993	gas phase; switching reaction(Co+)2H2, Δ_rS(440 K); Kemper, Bushnell, et al., 1993, 2; M

Enthalpy of reaction

Δ_rH° (kJ/mol)	T (K)	Method	Reference	Comment
94.6 (+5.0,-0.)		SIDT	Kemper, Bushnell, et al., 1993	gas phase; switching reaction(Co+)2H2, Δ_rS(440 K); Kemper, Bushnell, et al., 1993, 2; M

+ Methane = CH₄F^-

By formula: F^- + CH₄ = CH₄F^-

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	28.0	kJ/mol	N/A	Hiraoka, Mizuno, et al., 2001	gas phase; B
Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	6.82	kJ/mol	TDAs	Hiraoka, Mizuno, et al., 2001	gas phase; B

+ Methane = ( • Methane )

By formula: Fe⁺ + CH₄ = (Fe⁺ • CH₄)

Enthalpy of reaction

Δ_rH° (kJ/mol)	T (K)	Method	Reference	Comment
57. (+3.,-0.)		CID	Armentrout and Kickel, 1994	gas phase; guided ion beam CID; M

( • Methane ) + Methane = ( • 2 Methane )

By formula: (Fe⁺ • CH₄) + CH₄ = (Fe⁺ • 2CH₄)

Enthalpy of reaction

Δ_rH° (kJ/mol)	T (K)	Method	Reference	Comment
97.1 (+4.2,-0.)		CID	Armentrout and Kickel, 1994	gas phase; guided ion beam CID; M

( • 2 Methane ) + Methane = ( • 3 Methane )

By formula: (Fe⁺ • 2CH₄) + CH₄ = (Fe⁺ • 3CH₄)

Enthalpy of reaction

Δ_rH° (kJ/mol)	T (K)	Method	Reference	Comment
99.2 (+5.9,-0.)		CID	Armentrout and Kickel, 1994	gas phase; guided ion beam CID; M

( • 3 Methane ) + Methane = ( • 4 Methane )

By formula: (Fe⁺ • 3CH₄) + CH₄ = (Fe⁺ • 4CH₄)

Enthalpy of reaction

Δ_rH° (kJ/mol)	T (K)	Method	Reference	Comment
74.1 (+5.9,-0.)		CID	Armentrout and Kickel, 1994	gas phase; guided ion beam CID; M

+ Methane = ( • Methane )

By formula: H₃O⁺ + CH₄ = (H₃O⁺ • CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	33.	kJ/mol	HPMS	Bennet and Field, 1972	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	85.4	J/mol*K	HPMS	Bennet and Field, 1972	gas phase; M

( • Methane ) + Methane = ( • 2 Methane )

By formula: (H₃O⁺ • CH₄) + CH₄ = (H₃O⁺ • 2CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	14.	kJ/mol	HPMS	Bennet and Field, 1972	gas phase; Entropy change is questionable; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	34.	J/mol*K	HPMS	Bennet and Field, 1972	gas phase; Entropy change is questionable; M

H₃S⁺ + Methane = (H₃S⁺ • Methane )

By formula: H₃S⁺ + CH₄ = (H₃S⁺ • CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	16.	kJ/mol	HPMS	Bennet and Field, 1972, 2	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	75.7	J/mol*K	HPMS	Bennet and Field, 1972, 2	gas phase; M

+ Methane = ( • Methane )

By formula: H₄N⁺ + CH₄ = (H₄N⁺ • CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	15.	kJ/mol	HPMS	Bennet and Field, 1972, 2	gas phase; Entropy change is questionable; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	64.9	J/mol*K	HPMS	Bennet and Field, 1972, 2	gas phase; Entropy change is questionable; M

+ Methane = CH₄I^-

By formula: I^- + CH₄ = CH₄I^-

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	10.9	kJ/mol	N/A	Hiraoka, Mizuno, et al., 2001	gas phase; B
Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	-11.6	kJ/mol	TDAs	Hiraoka, Mizuno, et al., 2001	gas phase; B

+ Methane = ( • Methane )

By formula: Mg⁺ + CH₄ = (Mg⁺ • CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	28. ± 6.7	kJ/mol	CIDT	Andersen, Muntean, et al., 2000	RCD

( • Methane ) + Methane = ( • 2 Methane )

By formula: (Mg⁺ • CH₄) + CH₄ = (Mg⁺ • 2CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	15. ± 6.7	kJ/mol	CIDT	Andersen, Muntean, et al., 2000	RCD

+ Methane = ( • Methane )

By formula: Na⁺ + CH₄ = (Na⁺ • CH₄)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	30.	kJ/mol	HPMS	Castleman, Peterson, et al., 1983	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	59.0	J/mol*K	HPMS	Castleman, Peterson, et al., 1983	gas phase; M

Mass spectrum (electron ionization)

Go To: Top, Reaction thermochemistry data, Ion clustering data, 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	D.HENNEBERG, MAX-PLANCK INSTITUTE, MULHEIM, WEST GERMANY
NIST MS number	61313

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References

Go To: Top, Reaction thermochemistry data, Ion clustering data, Mass spectrum (electron ionization), Notes

Ellison, Engelking, et al., 1978
Ellison, G.B.; Engelking, P.C.; Lineberger, W.C., An experimental determination of the geometry and electron affinity of CH₃, J. Am. Chem. Soc., 1978, 100, 2556. [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, Lee-Ruff, et al., 1972
Bohme, D.K.; Lee-Ruff, E.; Young, L.B., Acidity order of selected bronsted acids in the gas phase at 300K, J. Am. Chem. Soc., 1972, 94, 5153. [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]

Hiraoka and Mori, 1989
Hiraoka, K.; Mori, T., Gas - Phase Stability and Structure of Cluster Ions CH5+(CH4)n with n = 1 - 9, Chem. Phys. Lett., 1989, 161, 2, 111, https://doi.org/10.1016/0009-2614(89)85040-7 . [all data]

Hiraoka and Kebarle, 1975
Hiraoka, K.; Kebarle, P., Energetics, Stabilities and Possible Structures of CH5+(CH4)n Clusters from Gas Phase Study of Equilibria CH5+(CH4)n - 1 + CH4 = CH5+(CH4)n for n = 1 - 5, J. Am. Chem. Soc., 1975, 97, 15, 4179, https://doi.org/10.1021/ja00848a005 . [all data]

Field and Beggs, 1971
Field, F.H.; Beggs, D.P., Reversible Reactions of Gas Phase Ions. III. Studies with Methane at 0.1-1.0 Torr and 77-300 K, J. Am. Chem. Soc., 1971, 93, 7, 1585, https://doi.org/10.1021/ja00736a003 . [all data]

Hiraoka, Mori, et al., 1993
Hiraoka, K.; Mori, T.; Yamabe, S., The Gas-Phase Solvation of C2H5+, s-C3H7+ and s-C4H9+ with CH4. The Isomeric Structures of C2H5+ and C2H5+.CH4, Chem. Phys. Lett., 1993, 207, 2-3, 178, https://doi.org/10.1016/0009-2614(93)87011-Q . [all data]

Hiroka and Kebarle, 1975
Hiroka, K.; Kebarle, P., Information on the Proton Affinity and Protolysis of Propane from Measurement of the Ion Cluster Equilibrium: C2H5+ + CH4 = C3H9+, Can. J. Phys., 1975, 53, 970. [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]

Armentrout and Kickel, 1994
Armentrout, P.B.; Kickel, B.L., Gas Phase Thermochemistry of Transition Metal Ligand Systems: Reassessment of Values and Periodic Trends, in Organometallic Ion Chemistry, B. S. Freiser, ed, 1994. [all data]

Haynes and Armentrout, 1996
Haynes, C.L.; Armentrout, P.B., Guided Ion Beam Determination of the Co+ - H2 Bond Dissociation energy, Chem Phys. Let., 1996, 249, 1-2, 64, https://doi.org/10.1016/0009-2614(95)01337-7 . [all data]

Kemper, Bushnell, et al., 1993, 2
Kemper, P.R.; Bushnell, J.; Von Helden, G.; Bowers, M.T., Co+(H2)n Clusters: Binding Energies and Molecular Parameters, J. Chem Phys., 1993, 97, 1, 52, https://doi.org/10.1021/j100103a012 . [all data]

Martinho Simões and Beauchamp, 1990
Martinho Simões, J.A.; Beauchamp, J.L., Chem. Rev., 1990, 90, 629. [all data]

Holm, 1981
Holm, T., J. Chem. Soc., Perkin Trans. II, 1981, 464.. [all data]

Pedley, 1994
Pedley, J.B., Thermodynamic Data and Structures of Organic Compounds; Thermodynamics Research Center Data Series, Vol I, Thermodynamics Research Center, College Station, 1994. [all data]

Martin and Finke, 1990
Martin, B.D.; Finke, R.G., J. Am. Chem. Soc., 1990, 112, 2419. [all data]

Martin and Finke, 1992
Martin, B.D.; Finke, R.G., J. Am. Chem. Soc., 1992, 114, 585. [all data]

Hiraoka and Kebarle, 1976
Hiraoka, K.; Kebarle, P., Stabilities and Energetics of Pentacoordinated Carbonium Ions. The Isomeric C2H7+ Ions and Some Higher Analogues: C3H9+ and C4H11+, J. Am. Chem. Soc., 1976, 98, 20, 6119, https://doi.org/10.1021/ja00436a009 . [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]

Bennet and Field, 1972
Bennet, S.L.; Field, F.H., Reversible Reactions of Gaseous Ions. V. The Methane - Water System at Low Temperatures, J. Am. Chem. Soc., 1972, 94, 15, 5188, https://doi.org/10.1021/ja00770a008 . [all data]

Bennet and Field, 1972, 2
Bennet, S.L.; Field, F.H., Reversible Reactions of Gaseous Ions. VI. The NH3 - CH4, H2S - CH4 and CF4 - CH4 Systems at Low Temperatures, J. Am. Chem. Soc., 1972, 94, 18, 6305, https://doi.org/10.1021/ja00773a009 . [all data]

Holm, 1974
Holm, T., J. Organometal. Chem., 1974, 77, 27. [all data]

Pedley and Rylance, 1977
Pedley, J.B.; Rylance, J., Computer Analysed Thermochemical Data: Organic and Organometallic Compounds, University of Sussex, Brigton, 1977. [all data]

Liebman, Martinho Simões, et al., 1995
Liebman, J.F.; Martinho Simões, J.A.; Slayden, S.W., In Lithium Chemistry: A Theoretical and Experimental Overview Wiley: New York, Sapse, A.-M.; Schleyer, P. von Ragué, ed(s)., 1995. [all data]

Lacher, Amador, et al., 1967
Lacher, J.R.; Amador, A.; Park, J.D., Reaction heats of organic compounds. Part 5.-Heats of hydrogenation of dichloromethane, 1,1- and 1,2-dichloroethane and 1,2-dichloropropane, Trans. Faraday Soc., 1967, 63, 1608-1611. [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]

Carson, Hartley, et al., 1949
Carson, A.S.; Hartley, K.; Skinner, H.A., Thermochemistry of metal alkyls. Part II.?The bond dissociation energies of some Zn?C and Cd?C bonds, and of Et?I., Trans. Faraday Soc., 1949, 45, 1159, https://doi.org/10.1039/tf9494501159 . [all data]

Cox and Pilcher, 1970, 2
Cox, J.D.; Pilcher, G., Thermochemistry of Organic and Organometallic Compounds in Academic Press, New York, 1970. [all data]

Hiraoka, Mizuno, et al., 2001
Hiraoka, K.; Mizuno, T.; Iino, T.; Eguchi, D.; Yamabe, S., Characteristic changes of bond energies for gas-phase cluster ions of halide ions with methane and chloromethanes, J. Phys. Chem. A, 2001, 105, 20, 4887-4893, https://doi.org/10.1021/jp010143n . [all data]

Hop and McMahon, 1991
Hop, C.E.C.A.; McMahon, T.B., Observation of a Weakly Bound Mn(CO)5+/CH4 Complex, J. Am. Chem. Soc., 1991, 113, 1, 355, https://doi.org/10.1021/ja00001a050 . [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]

Castleman, Peterson, et al., 1983
Castleman, A.W.; Peterson, K.I.; Upschulte, B.L.; Schelling, F.J., Energetics and Structure of Na+ Cluster Ions, Int. J. Mass Spectrom. Ion Phys., 1983, 47, 203, https://doi.org/10.1016/0020-7381(83)87171-X . [all data]

Notes

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Symbols used in this document:

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
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Methane

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Reaction thermochemistry data

Reactions 1 to 50

Enthalpy 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

Ion clustering data

Clustering reactions

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

Enthalpy of reaction

Enthalpy of reaction

Enthalpy of reaction

Mass spectrum (electron ionization)

Spectrum

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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