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Methyl cation


Reaction thermochemistry data

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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

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

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

Methyl cation + Xenon = (Methyl cation bullet Xenon)

By formula: CH3+ + Xe = (CH3+ bullet Xe)

Quantity Value Units Method Reference Comment
Deltar213.kJ/molPHPMSMcMahon, Heinis, et al., 1988gas phase; switching reaction(CH3+)N2, Entropy change calculated or estimated, uses MCA(N2) = 202. kJ/mol; Foster, Williamson, et al., 1974; M
Deltar231. ± 10.kJ/molICRHovey and McMahon, 1986gas phase; switching reaction(CH3+)CH3F, Entropy change calculated or estimated; M

Methyl cation + Krypton = (Methyl cation bullet Krypton)

By formula: CH3+ + Kr = (CH3+ bullet Kr)

Quantity Value Units Method Reference Comment
Deltar184.kJ/molPHPMSMcMahon, Heinis, et al., 1988gas phase; switching reaction(CH3+)N2, Entropy change calculated or estimated, uses MCA(N2) = 202. kJ/mol; Foster, Williamson, et al., 1974; M
Deltar200. ± 10.kJ/molICRHovey and McMahon, 1987gas phase; switching reaction(CH3+)N2, Entropy change calculated or estimated; M

CH2- + Hydrogen cation = Methyl cation

By formula: CH2- + H+ = CH3+

Quantity Value Units Method Reference Comment
Deltar1711.7 ± 1.7kJ/molD-EALeopold, Murray, et al., 1985gas phase; Singlet-triplet splitting of CH2 = 9.0 kcal; B
Quantity Value Units Method Reference Comment
Deltar1679.5 ± 2.0kJ/molH-TSLeopold, Murray, et al., 1985gas phase; Singlet-triplet splitting of CH2 = 9.0 kcal; B

Methyl cation + Nitrous oxide = (Methyl cation bullet Nitrous oxide)

By formula: CH3+ + N2O = (CH3+ bullet N2O)

Quantity Value Units Method Reference Comment
Deltar221.kJ/molPHPMSMcMahon, Heinis, et al., 1988gas phase; switching reaction(CH3+)N2, Entropy change calculated or estimated, uses MCA(N2) = 202. kJ/mol; Foster, Williamson, et al., 1974; M

Methyl cation + Hydrogen bromide = (Methyl cation bullet Hydrogen bromide)

By formula: CH3+ + HBr = (CH3+ bullet HBr)

Quantity Value Units Method Reference Comment
Deltar232.kJ/molPHPMSMcMahon, Heinis, et al., 1988gas phase; switching reaction(CH3+)N2, Entropy change calculated or estimated, uses MCA(N2) = 202. kJ/mol; Foster, Williamson, et al., 1974; M

Methyl cation + Methane, trifluoroiodo- = (Methyl cation bullet Methane, trifluoroiodo-)

By formula: CH3+ + CF3I = (CH3+ bullet CF3I)

Quantity Value Units Method Reference Comment
Deltar251.kJ/molPHPMSMcMahon, Heinis, et al., 1988gas phase; switching reaction(CH3+)N2, Entropy change calculated or estimated, uses MCA(N2) = 202. kJ/mol; Foster, Williamson, et al., 1974; M

Methyl cation + Sulfuryl fluoride = (Methyl cation bullet Sulfuryl fluoride)

By formula: CH3+ + F2O2S = (CH3+ bullet F2O2S)

Quantity Value Units Method Reference Comment
Deltar231.kJ/molPHPMSMcMahon, Heinis, et al., 1988gas phase; switching reaction(CH3+)N2, Entropy change calculated or estimated, uses MCA(N2) = 202. kJ/mol; Foster, Williamson, et al., 1974; M

Methyl cation + Sulfur dioxide = (Methyl cation bullet Sulfur dioxide)

By formula: CH3+ + O2S = (CH3+ bullet O2S)

Quantity Value Units Method Reference Comment
Deltar254.kJ/molPHPMSMcMahon, Heinis, et al., 1988gas phase; switching reaction(CH3+)N2, Entropy change calculated or estimated, uses MCA(N2) = 202. kJ/mol; Foster, Williamson, et al., 1974; M

Methyl cation + Hydrogen chloride = (Methyl cation bullet Hydrogen chloride)

By formula: CH3+ + HCl = (CH3+ bullet HCl)

Quantity Value Units Method Reference Comment
Deltar216.kJ/molPHPMSMcMahon, Heinis, et al., 1988gas phase; switching reaction(CH3+)N2, Entropy change calculated or estimated, uses MCA(N2) = 202. kJ/mol; Foster, Williamson, et al., 1974; M

Methyl cation + Nitrogen trifluoride = (Methyl cation bullet Nitrogen trifluoride)

By formula: CH3+ + F3N = (CH3+ bullet F3N)

Quantity Value Units Method Reference Comment
Deltar224.kJ/molPHPMSMcMahon, Heinis, et al., 1988gas phase; switching reaction(CH3+)N2, Entropy change calculated or estimated, uses MCA(N2) = 202. kJ/mol; Foster, Williamson, et al., 1974; M

Methyl cation + sulphuryl dichloride = (Methyl cation bullet sulphuryl dichloride)

By formula: CH3+ + Cl2O2S = (CH3+ bullet Cl2O2S)

Quantity Value Units Method Reference Comment
Deltar260.kJ/molPHPMSMcMahon, Heinis, et al., 1988gas phase; switching reaction(CH3+)N2, Entropy change calculated or estimated, uses MCA(N2) = 202. kJ/mol; Foster, Williamson, et al., 1974; M

Methyl cation + Carbon dioxide = (Methyl cation bullet Carbon dioxide)

By formula: CH3+ + CO2 = (CH3+ bullet CO2)

Quantity Value Units Method Reference Comment
Deltar207.kJ/molPHPMSMcMahon, Heinis, et al., 1988gas phase; switching reaction(CH3+)N2, Entropy change calculated or estimated, uses MCA(N2) = 202. kJ/mol; Foster, Williamson, et al., 1974; M

Methyl cation + C2ClF3O = (Methyl cation bullet C2ClF3O)

By formula: CH3+ + C2ClF3O = (CH3+ bullet C2ClF3O)

Quantity Value Units Method Reference Comment
Deltar251.kJ/molPHPMSMcMahon, Heinis, et al., 1988gas phase; switching reaction(CH3+)N2, Entropy change calculated or estimated, uses MCA(N2) = 202. kJ/mol; Foster, Williamson, et al., 1974; M

Methyl cation + Carbonyl sulfide = (Methyl cation bullet Carbonyl sulfide)

By formula: CH3+ + COS = (CH3+ bullet COS)

Quantity Value Units Method Reference Comment
Deltar239.kJ/molPHPMSMcMahon, Heinis, et al., 1988gas phase; switching reaction(CH3+)N2, Entropy change calculated or estimated, uses MCA(N2) = 202. kJ/mol; Foster, Williamson, et al., 1974; M

Methyl cation + Methyl fluoride = (Methyl cation bullet Methyl fluoride)

By formula: CH3+ + CH3F = (CH3+ bullet CH3F)

Quantity Value Units Method Reference Comment
Deltar230.kJ/molPHPMSMcMahon, Heinis, et al., 1988gas phase; switching reaction(CH3+)N2, Entropy change calculated or estimated, uses MCA(N2) = 202. kJ/mol; Foster, Williamson, et al., 1974; M

Methyl cation + 2-Propanone, 1,1,1,3,3,3-hexafluoro- = (Methyl cation bullet 2-Propanone, 1,1,1,3,3,3-hexafluoro-)

By formula: CH3+ + C3F6O = (CH3+ bullet C3F6O)

Quantity Value Units Method Reference Comment
Deltar245.kJ/molPHPMSMcMahon, Heinis, et al., 1988gas phase; switching reaction(CH3+)N2, Entropy change calculated or estimated, uses MCA(N2) = 202. kJ/mol; Foster, Williamson, et al., 1974; M

Methyl cation + Methane, bromo- = (Methyl cation bullet Methane, bromo-)

By formula: CH3+ + CH3Br = (CH3+ bullet CH3Br)

Quantity Value Units Method Reference Comment
Deltar265.kJ/molPHPMSMcMahon, Heinis, et al., 1988gas phase; switching reaction(CH3+)N2, Entropy change calculated or estimated, uses MCA(N2) = 202. kJ/mol; Foster, Williamson, et al., 1974; M

Methyl cation + Chloromethane = (Methyl cation bullet Chloromethane)

By formula: CH3+ + CH3Cl = (CH3+ bullet CH3Cl)

Quantity Value Units Method Reference Comment
Deltar259.kJ/molPHPMSMcMahon, Heinis, et al., 1988gas phase; switching reaction(CH3+)N2, Entropy change calculated or estimated, uses MCA(N2) = 202. kJ/mol; Foster, Williamson, et al., 1974; M

Methyl cation + Carbon disulfide = (Methyl cation bullet Carbon disulfide)

By formula: CH3+ + CS2 = (CH3+ bullet CS2)

Quantity Value Units Method Reference Comment
Deltar252.kJ/molPHPMSMcMahon, Heinis, et al., 1988gas phase; switching reaction(CH3+)N2, Entropy change calculated or estimated, uses MCA(N2) = 202. kJ/mol; Foster, Williamson, et al., 1974; M

Methyl cation + Bromotrifluoromethane = (Methyl cation bullet Bromotrifluoromethane)

By formula: CH3+ + CBrF3 = (CH3+ bullet CBrF3)

Quantity Value Units Method Reference Comment
Deltar224.kJ/molPHPMSMcMahon, Heinis, et al., 1988gas phase; switching reaction(CH3+)N2, Entropy change calculated or estimated, uses MCA(N2) = 202. kJ/mol; Foster, Williamson, et al., 1974; M

Methyl cation + Chlorotrifluoromethane = (Methyl cation bullet Chlorotrifluoromethane)

By formula: CH3+ + CClF3 = (CH3+ bullet CClF3)

Quantity Value Units Method Reference Comment
Deltar221.kJ/molPHPMSMcMahon, Heinis, et al., 1988gas phase; switching reaction(CH3+)N2, Entropy change calculated or estimated, uses MCA(N2) = 202. kJ/mol; Foster, Williamson, et al., 1974; M

(Methyl cation bullet 2Argon) + Argon = (Methyl cation bullet 3Argon)

By formula: (CH3+ bullet 2Ar) + Ar = (CH3+ bullet 3Ar)

Quantity Value Units Method Reference Comment
Deltar8.2 ± 0.8kJ/molPHPMSHiraoka, Kudaka, et al., 1991gas phase; M
Quantity Value Units Method Reference Comment
Deltar93.3J/mol*KPHPMSHiraoka, Kudaka, et al., 1991gas phase; M

(Methyl cation bullet 3Argon) + Argon = (Methyl cation bullet 4Argon)

By formula: (CH3+ bullet 3Ar) + Ar = (CH3+ bullet 4Ar)

Quantity Value Units Method Reference Comment
Deltar8.2 ± 0.8kJ/molPHPMSHiraoka, Kudaka, et al., 1991gas phase; M
Quantity Value Units Method Reference Comment
Deltar88.3J/mol*KPHPMSHiraoka, Kudaka, et al., 1991gas phase; M

(Methyl cation bullet 4Argon) + Argon = (Methyl cation bullet 5Argon)

By formula: (CH3+ bullet 4Ar) + Ar = (CH3+ bullet 5Ar)

Quantity Value Units Method Reference Comment
Deltar8.1 ± 0.8kJ/molPHPMSHiraoka, Kudaka, et al., 1991gas phase; M
Quantity Value Units Method Reference Comment
Deltar86.2J/mol*KPHPMSHiraoka, Kudaka, et al., 1991gas phase; M

(Methyl cation bullet 5Argon) + Argon = (Methyl cation bullet 6Argon)

By formula: (CH3+ bullet 5Ar) + Ar = (CH3+ bullet 6Ar)

Quantity Value Units Method Reference Comment
Deltar8. ± 1.kJ/molPHPMSHiraoka, Kudaka, et al., 1991gas phase; M
Quantity Value Units Method Reference Comment
Deltar87.9J/mol*KPHPMSHiraoka, Kudaka, et al., 1991gas phase; M

(Methyl cation bullet 6Argon) + Argon = (Methyl cation bullet 7Argon)

By formula: (CH3+ bullet 6Ar) + Ar = (CH3+ bullet 7Ar)

Quantity Value Units Method Reference Comment
Deltar8. ± 2.kJ/molPHPMSHiraoka, Kudaka, et al., 1991gas phase; M
Quantity Value Units Method Reference Comment
Deltar88.7J/mol*KPHPMSHiraoka, Kudaka, et al., 1991gas phase; M

(Methyl cation bullet Argon) + Argon = (Methyl cation bullet 2Argon)

By formula: (CH3+ bullet Ar) + Ar = (CH3+ bullet 2Ar)

Quantity Value Units Method Reference Comment
Deltar9.5 ± 0.8kJ/molPHPMSHiraoka, Kudaka, et al., 1991gas phase; M
Quantity Value Units Method Reference Comment
Deltar65.7J/mol*KPHPMSHiraoka, Kudaka, et al., 1991gas phase; M

Methyl cation + Argon = (Methyl cation bullet Argon)

By formula: CH3+ + Ar = (CH3+ bullet Ar)

Quantity Value Units Method Reference Comment
Deltar47.3 ± 8.4kJ/molPHPMSHiraoka, Kudaka, et al., 1991gas phase; M
Quantity Value Units Method Reference Comment
Deltar84.1J/mol*KPHPMSHiraoka, Kudaka, et al., 1991gas phase; M

Methyl cation + Propane, 2-chloro- = (Methyl cation bullet Propane, 2-chloro-)

By formula: CH3+ + C3H7Cl = (CH3+ bullet C3H7Cl)

Quantity Value Units Method Reference Comment
Deltar320.kJ/molPHPMSSharma, Meza de Hojer, et al., 1985gas phase; from i-C3H7+ + CH3Cl; Cox and Pilcher, 1970, Rosenstock, Buff, et al., 1982, Sen Sharma and Kebarle, 1978; M

Methyl cation + Ethyl Chloride = (Methyl cation bullet Ethyl Chloride)

By formula: CH3+ + C2H5Cl = (CH3+ bullet C2H5Cl)

Quantity Value Units Method Reference Comment
Deltar300.kJ/molPHPMSSharma, Meza de Hojer, et al., 1985gas phase; from Et+ + CH3Cl; Cox and Pilcher, 1970, Rosenstock, Buff, et al., 1982; Sen Sharma and Kebarle, 1978; M

Methyl cation + Propane, 2-chloro-2-methyl- = (Methyl cation bullet Propane, 2-chloro-2-methyl-)

By formula: CH3+ + C4H9Cl = (CH3+ bullet C4H9Cl)

Quantity Value Units Method Reference Comment
Deltar340.kJ/molPHPMSSharma, Meza de Hojer, et al., 1985gas phase; from t-C4H9+ + CH3Cl; Cox and Pilcher, 1970, Rosenstock, Buff, et al., 1982; M

(Methyl cation bullet 7Argon) + Argon = (Methyl cation bullet 8Argon)

By formula: (CH3+ bullet 7Ar) + Ar = (CH3+ bullet 8Ar)

Quantity Value Units Method Reference Comment
Deltar8.08kJ/molPHPMSHiraoka, Kudaka, et al., 1991gas phase; Entropy change calculated or estimated; M

Methyl cation + Nitrogen = (Methyl cation bullet Nitrogen)

By formula: CH3+ + N2 = (CH3+ bullet N2)

Quantity Value Units Method Reference Comment
Deltar203.kJ/molPDissFoster, Williamson, et al., 1974gas phase; M

References

Go To: Top, Reaction thermochemistry data, Notes

Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

McMahon, Heinis, et al., 1988
McMahon, T.; Heinis, T.; Nicol, G.; Hovey, J.K.; Kebarle, P., Methyl Cation Affinities, J. Am. Chem. Soc., 1988, 110, 23, 7591, https://doi.org/10.1021/ja00231a002 . [all data]

Foster, Williamson, et al., 1974
Foster, M.S.; Williamson, A.D.; Beauchamp, J.L., Photoionization mass spectrometry of trans-azomethane, Int. J. Mass Spectrom. Ion Phys., 1974, 15, 429. [all data]

Hovey and McMahon, 1986
Hovey, J.K.; McMahon, T.B., C-Xe Bond strength in the methylxenonium cation determined from ion cyclotron resonance methyl cation exchange equilibria, J. Am. Chem. Soc., 1986, 108, 528. [all data]

Hovey and McMahon, 1987
Hovey, J.K.; McMahon, T.B., Bond Strength in the Methylkryptonium Ion Determined from Ion Cyclotron Resonance Methyl Cation Exchange Equilibria, J. Phys. Chem., 1987, 91, 17, 4560, https://doi.org/10.1021/j100301a028 . [all data]

Leopold, Murray, et al., 1985
Leopold, D.G.; Murray, K.K.; Miller, A.E.S.; Lineberger, W.C., Methylene: A study of the X3B1 and the 1A1 states by photoelectron spectroscopy of CH2- and CD2-, J. Chem. Phys., 1985, 83, 4849. [all data]

Hiraoka, Kudaka, et al., 1991
Hiraoka, K.; Kudaka, I.; Yamabe, S., A Charge-Transfer Complex CH3+ Ar in the Gas Phase, Chem. Phys. Lett., 1991, 178, 1, 103, https://doi.org/10.1016/0009-2614(91)85060-A . [all data]

Sharma, Meza de Hojer, et al., 1985
Sharma, D.M.S.; Meza de Hojer, S.; Kebarle, P., Stabilities of halonium ions from a study of gas-phase equilibria R+ + XR' = (RXR')+, J. Am. Chem. Soc., 1985, 107, 13, 3757, https://doi.org/10.1021/ja00299a002 . [all data]

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

Rosenstock, Buff, et al., 1982
Rosenstock, H.M.; Buff, R.; Ferreira, M.A.A.; Lias, S.G.; Parr, A.C.; Stockbauer, R.L.; Holmes, J.L., Fragmentation mechanism and energetics of some alkyl halide ions, J. Am. Chem. Soc., 1982, 104, 2337. [all data]

Sen Sharma and Kebarle, 1978
Sen Sharma, D.K.; Kebarle, P., Binding Energies and Stabilities of Chloronium Ions from Study of the Gas - Phase Equilibria: R1+ + ClR2 = R1ClR2+, J. Am. Chem. Soc., 1978, 100, 18, 5826, https://doi.org/10.1021/ja00486a039 . [all data]


Notes

Go To: Top, Reaction thermochemistry data, References