Methyl cation

Reaction thermochemistry data

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

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 • Xenon)

By formula: CH3+ + Xe = (CH3+ • Xe)

Quantity Value Units Method Reference Comment
ΔrH°213.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
ΔrH°231. ± 10.kJ/molICRHovey and McMahon, 1986gas phase; switching reaction(CH3+)CH3F, Entropy change calculated or estimated; M

Methyl cation + Krypton = (Methyl cation • Krypton)

By formula: CH3+ + Kr = (CH3+ • Kr)

Quantity Value Units Method Reference Comment
ΔrH°184.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
ΔrH°200. ± 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
ΔrH°1711.7 ± 1.7kJ/molD-EALeopold, Murray, et al., 1985gas phase; Singlet-triplet splitting of CH2 = 9.0 kcal; B
Quantity Value Units Method Reference Comment
ΔrG°1679.5 ± 2.0kJ/molH-TSLeopold, Murray, et al., 1985gas phase; Singlet-triplet splitting of CH2 = 9.0 kcal; B

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

By formula: CH3+ + N2O = (CH3+ • N2O)

Quantity Value Units Method Reference Comment
ΔrH°221.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 • Hydrogen bromide)

By formula: CH3+ + HBr = (CH3+ • HBr)

Quantity Value Units Method Reference Comment
ΔrH°232.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 • Methane, trifluoroiodo-)

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

Quantity Value Units Method Reference Comment
ΔrH°251.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 • Sulfuryl fluoride)

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

Quantity Value Units Method Reference Comment
ΔrH°231.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 • Sulfur dioxide)

By formula: CH3+ + O2S = (CH3+ • O2S)

Quantity Value Units Method Reference Comment
ΔrH°254.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 • Hydrogen chloride)

By formula: CH3+ + HCl = (CH3+ • HCl)

Quantity Value Units Method Reference Comment
ΔrH°216.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 • Nitrogen trifluoride)

By formula: CH3+ + F3N = (CH3+ • F3N)

Quantity Value Units Method Reference Comment
ΔrH°224.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 • sulphuryl dichloride)

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

Quantity Value Units Method Reference Comment
ΔrH°260.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 • Carbon dioxide)

By formula: CH3+ + CO2 = (CH3+ • CO2)

Quantity Value Units Method Reference Comment
ΔrH°207.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 • C2ClF3O)

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

Quantity Value Units Method Reference Comment
ΔrH°251.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 • Carbonyl sulfide)

By formula: CH3+ + COS = (CH3+ • COS)

Quantity Value Units Method Reference Comment
ΔrH°239.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 • Methyl fluoride)

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

Quantity Value Units Method Reference Comment
ΔrH°230.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 • 2-Propanone, 1,1,1,3,3,3-hexafluoro-)

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

Quantity Value Units Method Reference Comment
ΔrH°245.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 • Methane, bromo-)

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

Quantity Value Units Method Reference Comment
ΔrH°265.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 • Chloromethane)

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

Quantity Value Units Method Reference Comment
ΔrH°259.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 • Carbon disulfide)

By formula: CH3+ + CS2 = (CH3+ • CS2)

Quantity Value Units Method Reference Comment
ΔrH°252.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 • Bromotrifluoromethane)

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

Quantity Value Units Method Reference Comment
ΔrH°224.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 • Chlorotrifluoromethane)

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

Quantity Value Units Method Reference Comment
ΔrH°221.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 • 2Argon) + Argon = (Methyl cation • 3Argon)

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

Quantity Value Units Method Reference Comment
ΔrH°8.2 ± 0.8kJ/molPHPMSHiraoka, Kudaka, et al., 1991gas phase; M
Quantity Value Units Method Reference Comment
ΔrS°93.3J/mol*KPHPMSHiraoka, Kudaka, et al., 1991gas phase; M

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

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

Quantity Value Units Method Reference Comment
ΔrH°8.2 ± 0.8kJ/molPHPMSHiraoka, Kudaka, et al., 1991gas phase; M
Quantity Value Units Method Reference Comment
ΔrS°88.3J/mol*KPHPMSHiraoka, Kudaka, et al., 1991gas phase; M

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

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

Quantity Value Units Method Reference Comment
ΔrH°8.1 ± 0.8kJ/molPHPMSHiraoka, Kudaka, et al., 1991gas phase; M
Quantity Value Units Method Reference Comment
ΔrS°86.2J/mol*KPHPMSHiraoka, Kudaka, et al., 1991gas phase; M

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

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

Quantity Value Units Method Reference Comment
ΔrH°8. ± 1.kJ/molPHPMSHiraoka, Kudaka, et al., 1991gas phase; M
Quantity Value Units Method Reference Comment
ΔrS°87.9J/mol*KPHPMSHiraoka, Kudaka, et al., 1991gas phase; M

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

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

Quantity Value Units Method Reference Comment
ΔrH°8. ± 2.kJ/molPHPMSHiraoka, Kudaka, et al., 1991gas phase; M
Quantity Value Units Method Reference Comment
ΔrS°88.7J/mol*KPHPMSHiraoka, Kudaka, et al., 1991gas phase; M

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

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

Quantity Value Units Method Reference Comment
ΔrH°9.5 ± 0.8kJ/molPHPMSHiraoka, Kudaka, et al., 1991gas phase; M
Quantity Value Units Method Reference Comment
ΔrS°65.7J/mol*KPHPMSHiraoka, Kudaka, et al., 1991gas phase; M

Methyl cation + Argon = (Methyl cation • Argon)

By formula: CH3+ + Ar = (CH3+ • Ar)

Quantity Value Units Method Reference Comment
ΔrH°47.3 ± 8.4kJ/molPHPMSHiraoka, Kudaka, et al., 1991gas phase; M
Quantity Value Units Method Reference Comment
ΔrS°84.1J/mol*KPHPMSHiraoka, Kudaka, et al., 1991gas phase; M

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

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

Quantity Value Units Method Reference Comment
ΔrH°320.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 • Ethyl Chloride)

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

Quantity Value Units Method Reference Comment
ΔrH°300.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 • Propane, 2-chloro-2-methyl-)

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

Quantity Value Units Method Reference Comment
ΔrH°340.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 • 7Argon) + Argon = (Methyl cation • 8Argon)

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

Quantity Value Units Method Reference Comment
ΔrH°8.08kJ/molPHPMSHiraoka, Kudaka, et al., 1991gas phase; Entropy change calculated or estimated; M

Methyl cation + Nitrogen = (Methyl cation • Nitrogen)

By formula: CH3+ + N2 = (CH3+ • N2)

Quantity Value Units Method Reference Comment
ΔrH°203.kJ/molPDissFoster, Williamson, et al., 1974gas phase; M

Gas phase ion energetics data

Go To: Top, Reaction thermochemistry data, Ion clustering data, Vibrational and/or electronic energy levels, NIST Free Links, References, Notes

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

Data compiled by: John E. Bartmess

De-protonation reactions

CH2- + Hydrogen cation = Methyl cation

By formula: CH2- + H+ = CH3+

Quantity Value Units Method Reference Comment
ΔrH°1711.7 ± 1.7kJ/molD-EALeopold, Murray, et al., 1985gas phase; Singlet-triplet splitting of CH2 = 9.0 kcal
Quantity Value Units Method Reference Comment
ΔrG°1679.5 ± 2.0kJ/molH-TSLeopold, Murray, et al., 1985gas phase; Singlet-triplet splitting of CH2 = 9.0 kcal

Ion clustering data

Go To: Top, Reaction thermochemistry data, Gas phase ion energetics data, Vibrational and/or electronic energy levels, NIST Free Links, References, Notes

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:
B - John E. Bartmess
M - Michael M. Meot-Ner (Mautner) and Sharon G. Lias

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

Clustering reactions

CH2- + Hydrogen cation = Methyl cation

By formula: CH2- + H+ = CH3+

Quantity Value Units Method Reference Comment
ΔrH°1711.7 ± 1.7kJ/molD-EALeopold, Murray, et al., 1985gas phase; Singlet-triplet splitting of CH2 = 9.0 kcal; B
Quantity Value Units Method Reference Comment
ΔrG°1679.5 ± 2.0kJ/molH-TSLeopold, Murray, et al., 1985gas phase; Singlet-triplet splitting of CH2 = 9.0 kcal; B

Methyl cation + Argon = (Methyl cation • Argon)

By formula: CH3+ + Ar = (CH3+ • Ar)

Quantity Value Units Method Reference Comment
ΔrH°47.3 ± 8.4kJ/molPHPMSHiraoka, Kudaka, et al., 1991gas phase; M
Quantity Value Units Method Reference Comment
ΔrS°84.1J/mol*KPHPMSHiraoka, Kudaka, et al., 1991gas phase; M

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

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

Quantity Value Units Method Reference Comment
ΔrH°9.5 ± 0.8kJ/molPHPMSHiraoka, Kudaka, et al., 1991gas phase; M
Quantity Value Units Method Reference Comment
ΔrS°65.7J/mol*KPHPMSHiraoka, Kudaka, et al., 1991gas phase; M

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

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

Quantity Value Units Method Reference Comment
ΔrH°8.2 ± 0.8kJ/molPHPMSHiraoka, Kudaka, et al., 1991gas phase; M
Quantity Value Units Method Reference Comment
ΔrS°93.3J/mol*KPHPMSHiraoka, Kudaka, et al., 1991gas phase; M

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

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

Quantity Value Units Method Reference Comment
ΔrH°8.2 ± 0.8kJ/molPHPMSHiraoka, Kudaka, et al., 1991gas phase; M
Quantity Value Units Method Reference Comment
ΔrS°88.3J/mol*KPHPMSHiraoka, Kudaka, et al., 1991gas phase; M

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

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

Quantity Value Units Method Reference Comment
ΔrH°8.1 ± 0.8kJ/molPHPMSHiraoka, Kudaka, et al., 1991gas phase; M
Quantity Value Units Method Reference Comment
ΔrS°86.2J/mol*KPHPMSHiraoka, Kudaka, et al., 1991gas phase; M

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

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

Quantity Value Units Method Reference Comment
ΔrH°8. ± 1.kJ/molPHPMSHiraoka, Kudaka, et al., 1991gas phase; M
Quantity Value Units Method Reference Comment
ΔrS°87.9J/mol*KPHPMSHiraoka, Kudaka, et al., 1991gas phase; M

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

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

Quantity Value Units Method Reference Comment
ΔrH°8. ± 2.kJ/molPHPMSHiraoka, Kudaka, et al., 1991gas phase; M
Quantity Value Units Method Reference Comment
ΔrS°88.7J/mol*KPHPMSHiraoka, Kudaka, et al., 1991gas phase; M

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

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

Quantity Value Units Method Reference Comment
ΔrH°8.08kJ/molPHPMSHiraoka, Kudaka, et al., 1991gas phase; Entropy change calculated or estimated; M

Methyl cation + Bromotrifluoromethane = (Methyl cation • Bromotrifluoromethane)

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

Quantity Value Units Method Reference Comment
ΔrH°224.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 • Chlorotrifluoromethane)

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

Quantity Value Units Method Reference Comment
ΔrH°221.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 • Methane, trifluoroiodo-)

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

Quantity Value Units Method Reference Comment
ΔrH°251.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 • Methane, bromo-)

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

Quantity Value Units Method Reference Comment
ΔrH°265.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 • Chloromethane)

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

Quantity Value Units Method Reference Comment
ΔrH°259.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 • Methyl fluoride)

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

Quantity Value Units Method Reference Comment
ΔrH°230.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 • Carbonyl sulfide)

By formula: CH3+ + COS = (CH3+ • COS)

Quantity Value Units Method Reference Comment
ΔrH°239.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 • Carbon dioxide)

By formula: CH3+ + CO2 = (CH3+ • CO2)

Quantity Value Units Method Reference Comment
ΔrH°207.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 • Carbon disulfide)

By formula: CH3+ + CS2 = (CH3+ • CS2)

Quantity Value Units Method Reference Comment
ΔrH°252.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 • C2ClF3O)

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

Quantity Value Units Method Reference Comment
ΔrH°251.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 + Ethyl Chloride = (Methyl cation • Ethyl Chloride)

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

Quantity Value Units Method Reference Comment
ΔrH°300.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 + 2-Propanone, 1,1,1,3,3,3-hexafluoro- = (Methyl cation • 2-Propanone, 1,1,1,3,3,3-hexafluoro-)

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

Quantity Value Units Method Reference Comment
ΔrH°245.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 + Propane, 2-chloro- = (Methyl cation • Propane, 2-chloro-)

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

Quantity Value Units Method Reference Comment
ΔrH°320.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 + Propane, 2-chloro-2-methyl- = (Methyl cation • Propane, 2-chloro-2-methyl-)

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

Quantity Value Units Method Reference Comment
ΔrH°340.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 + sulphuryl dichloride = (Methyl cation • sulphuryl dichloride)

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

Quantity Value Units Method Reference Comment
ΔrH°260.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 • Sulfuryl fluoride)

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

Quantity Value Units Method Reference Comment
ΔrH°231.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 • Nitrogen trifluoride)

By formula: CH3+ + F3N = (CH3+ • F3N)

Quantity Value Units Method Reference Comment
ΔrH°224.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 • Hydrogen bromide)

By formula: CH3+ + HBr = (CH3+ • HBr)

Quantity Value Units Method Reference Comment
ΔrH°232.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 • Hydrogen chloride)

By formula: CH3+ + HCl = (CH3+ • HCl)

Quantity Value Units Method Reference Comment
ΔrH°216.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 + Krypton = (Methyl cation • Krypton)

By formula: CH3+ + Kr = (CH3+ • Kr)

Quantity Value Units Method Reference Comment
ΔrH°184.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
ΔrH°200. ± 10.kJ/molICRHovey and McMahon, 1987gas phase; switching reaction(CH3+)N2, Entropy change calculated or estimated; M

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

By formula: CH3+ + N2O = (CH3+ • N2O)

Quantity Value Units Method Reference Comment
ΔrH°221.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 = (Methyl cation • Nitrogen)

By formula: CH3+ + N2 = (CH3+ • N2)

Quantity Value Units Method Reference Comment
ΔrH°203.kJ/molPDissFoster, Williamson, et al., 1974gas phase; M

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

By formula: CH3+ + O2S = (CH3+ • O2S)

Quantity Value Units Method Reference Comment
ΔrH°254.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 + Xenon = (Methyl cation • Xenon)

By formula: CH3+ + Xe = (CH3+ • Xe)

Quantity Value Units Method Reference Comment
ΔrH°213.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
ΔrH°231. ± 10.kJ/molICRHovey and McMahon, 1986gas phase; switching reaction(CH3+)CH3F, Entropy change calculated or estimated; M

Vibrational and/or electronic energy levels

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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 by: Marilyn E. Jacox

State:   A 1E'
 Energy 
 (cm-1) 		  Med.   Transition   λmin 
 (nm) 		  λmax 
 (nm) 		  References
To = 50510 ± 280 gas Dyke, Jonathan, et al., 1976

State:   a 3E'
 Energy 
 (cm-1) 		  Med.   Transition   λmin 
 (nm) 		  λmax 
 (nm) 		  References
To = 39700 ± 280 gas Dyke, Jonathan, et al., 1976

State:   X

Vib. 
sym. 		  No.   Approximate 
 type of mode 		  cm-1   Med.   Method   References
a2 2 OPLA 1359 ± 7 gas TPE PD Koenig, Balle, et al., 1975
Dyke, Jonathan, et al., 1976
Liu, Gross, et al., 2001
Cunha de Miranda, Alcaraz, et al., 2010
e' 3 CH stretch 3108.38 gas LD Crofton, Kreiner, et al., 1985
Crofton, Jagod, et al., 1988
Jagod, Gabrys, et al., 1994
3 CH stretch 3115.05 T H gas PF Olkhov, Nizkorodov, et al., 1999
3 CH stretch 3119.37 T gas PF Dopfer, Olkhov, et al., 2000
3 CH stretch 3145 ± 30 A gas PF Olkhov, Nizkorodov, et al., 1998
4 Deformation 1370 ± 7 gas PD Liu, Gross, et al., 2001

Additional references: Jacox, 1994, page 124; Jacox, 1998, page 213; Jacox, 2003, page 156; Dickinson, Chelmick, et al., 2001; Schulenburg, Alcaraz, et al., 2006

Notes

H(1/2)(2ν)
TTentative assignment or approximate value
oEnergy separation between the v = 0 levels of the excited and electronic ground states.
A0~1 cm-1 uncertainty

References

Go To: Top, Reaction thermochemistry data, Gas phase ion energetics data, Ion clustering data, Vibrational and/or electronic energy levels, NIST Free Links, 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]

Dyke, Jonathan, et al., 1976
Dyke, J.; Jonathan, N.; Lee, E.; Morris, A., J. Chem. Soc., 1976, Faraday Trans. 2 72, 1385. [all data]

Koenig, Balle, et al., 1975
Koenig, T.; Balle, T.; Snell, W., Helium(I) photoelectron spectra of organic radicals, J. Am. Chem. Soc., 1975, 97, 662. [all data]

Liu, Gross, et al., 2001
Liu, X.; Gross, R.L.; Suits, A.G., "Heavy Electron" Photoelectron Spectroscopy: Rotationally Resolved Ion Pair Imaging of CH3+, Science, 2001, 294, 5551, 2527, https://doi.org/10.1126/science.1066595 . [all data]

Cunha de Miranda, Alcaraz, et al., 2010
Cunha de Miranda, B.K.; Alcaraz, C.; Elhanine, M.; Noller, B.; Hemberger, P.; Fischer, I.; Garcia, G.A.; Soldi-Lose, H., et al., Threshold Photoelectron Spectroscopy of the Methyl Radical Isotopomers, CH, J. Phys. Chem. A, 2010, 114, 14, 4818, https://doi.org/10.1021/jp909422q . [all data]

Crofton, Kreiner, et al., 1985
Crofton, M.W.; Kreiner, W.A.; Jagod, M.-F.; Rehfuss, G.D.; Oka, T., Observation of the infrared spectrum of methyl cation CH+3, J. Chem. Phys., 1985, 83, 7, 3702, https://doi.org/10.1063/1.449125 . [all data]

Crofton, Jagod, et al., 1988
Crofton, M.W.; Jagod, M.-F.; Rehfuss, B.D.; Kreiner, W.A.; Oka, T., Infrared spectroscopy of carbo-ions. III. ν3 band of methyl cation CH+3, J. Chem. Phys., 1988, 88, 2, 666, https://doi.org/10.1063/1.454194 . [all data]

Jagod, Gabrys, et al., 1994
Jagod, M.-F.; Gabrys, C.M.; Rosslein, M.; Uy, D.; Oka, T., Infrared spectrum of CH, Can. J. Phys., 1994, 72, 11-12, 1192, https://doi.org/10.1139/p94-153 . [all data]

Olkhov, Nizkorodov, et al., 1999
Olkhov, R.V.; Nizkorodov, S.A.; Dopfer, O., Intermolecular interaction in the CH[sub 3][sup +]--He ionic complex revealed by ab initio calculations and infrared photodissociation spectroscopy, J. Chem. Phys., 1999, 110, 19, 9527, https://doi.org/10.1063/1.478917 . [all data]

Dopfer, Olkhov, et al., 2000
Dopfer, O.; Olkhov, R.V.; Maier, J.P., Microsolvation of the methyl cation in neon: Infrared spectra and ab initio calculations of CH[sub 3][sup +]--Ne and CH[sub 3][sup +]--Ne[sub 2], J. Chem. Phys., 2000, 112, 5, 2176, https://doi.org/10.1063/1.480783 . [all data]

Olkhov, Nizkorodov, et al., 1998
Olkhov, R.V.; Nizkorodov, S.A.; Dopfer, O., Infrared photodissociation spectra of CH[sub 3][sup +]--Ar[sub n] complexes (n=1--8), J. Chem. Phys., 1998, 108, 24, 10046, https://doi.org/10.1063/1.476465 . [all data]

Jacox, 1994
Jacox, M.E., Vibrational and electronic energy levels of polyatomic transient molecules, American Chemical Society, Washington, DC, 1994, 464. [all data]

Jacox, 1998
Jacox, M.E., Vibrational and electronic energy levels of polyatomic transient molecules: supplement A, J. Phys. Chem. Ref. Data, 1998, 27, 2, 115-393, https://doi.org/10.1063/1.556017 . [all data]

Jacox, 2003
Jacox, M.E., Vibrational and electronic energy levels of polyatomic transient molecules: supplement B, J. Phys. Chem. Ref. Data, 2003, 32, 1, 1-441, https://doi.org/10.1063/1.1497629 . [all data]

Dickinson, Chelmick, et al., 2001
Dickinson, H.; Chelmick, T.; Softley, T.P., (2+1´) mass analyzed threshold ionization (MATI) spectroscopy of the CD3 radical, Chem. Phys. Lett., 2001, 338, 1, 37, https://doi.org/10.1016/S0009-2614(01)00229-9 . [all data]

Schulenburg, Alcaraz, et al., 2006
Schulenburg, A.M.; Alcaraz, Ch.; Grassi, G.; Merkt, F., Rovibrational photoionization dynamics of methyl and its isotopomers studied by high-resolution photoionization and photoelectron spectroscopy, J. Chem. Phys., 2006, 125, 10, 104310, https://doi.org/10.1063/1.2348875 . [all data]

Notes

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