Methane, protonated


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 by: 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. 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

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

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

Quantity Value Units Method Reference Comment
Δr5.3 ± 0.3kcal/molPHPMSHiraoka and Mori, 1989gas phase
Δr5.9kcal/molPHPMSHiraoka and Kebarle, 1975gas phase
Δr1.5kcal/molHPMSField and Beggs, 1971gas phase; Entropy change is questionable
Quantity Value Units Method Reference Comment
Δr24.9cal/mol*KPHPMSHiraoka and Mori, 1989gas phase
Δr24.4cal/mol*KPHPMSHiraoka and Kebarle, 1975gas phase
Δr7.2cal/mol*KHPMSField and Beggs, 1971gas phase; Entropy change is questionable

CH5+ + Methane = (CH5+ • Methane)

By formula: CH5+ + CH4 = (CH5+ • CH4)

Quantity Value Units Method Reference Comment
Δr6.9 ± 0.3kcal/molPHPMSHiraoka and Mori, 1989gas phase
Δr7.4kcal/molPHPMSHiraoka and Kebarle, 1975gas phase
Δr4.1kcal/molHPMSField and Beggs, 1971gas phase; Entropy change is questionable
Quantity Value Units Method Reference Comment
Δr22.1cal/mol*KPHPMSHiraoka and Mori, 1989gas phase
Δr20.8cal/mol*KPHPMSHiraoka and Kebarle, 1975gas phase
Δr12.4cal/mol*KHPMSField and Beggs, 1971gas phase; Entropy change is questionable

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

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

Quantity Value Units Method Reference Comment
Δr3.1 ± 0.2kcal/molPHPMSHiraoka and Mori, 1989gas phase
Δr4.1kcal/molPHPMSHiraoka and Kebarle, 1975gas phase
Quantity Value Units Method Reference Comment
Δr22.4cal/mol*KPHPMSHiraoka and Mori, 1989gas phase
Δr26.1cal/mol*KPHPMSHiraoka and Kebarle, 1975gas phase

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

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

Quantity Value Units Method Reference Comment
Δr3.0 ± 0.2kcal/molPHPMSHiraoka and Mori, 1989gas phase
Δr3.9kcal/molPHPMSHiraoka and Kebarle, 1975gas phase
Quantity Value Units Method Reference Comment
Δr23.7cal/mol*KPHPMSHiraoka and Mori, 1989gas phase
Δr26.6cal/mol*KPHPMSHiraoka and Kebarle, 1975gas phase

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

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

Quantity Value Units Method Reference Comment
Δr1.54kcal/molPHPMSHiraoka and Mori, 1989gas phase; Entropy change calculated or estimated
Quantity Value Units Method Reference Comment
Δr20.cal/mol*KN/AHiraoka and Mori, 1989gas phase; Entropy change calculated or estimated

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

By formula: (CH5+ • 2H2) + H2 = (CH5+ • 3H2)

Quantity Value Units Method Reference Comment
Δr1.61 ± 0.10kcal/molPHPMSHiraoka, Kudaka, et al., 1991gas phase
Quantity Value Units Method Reference Comment
Δr22.6cal/mol*KPHPMSHiraoka, Kudaka, et al., 1991gas phase

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

By formula: (CH5+ • 3H2) + H2 = (CH5+ • 4H2)

Quantity Value Units Method Reference Comment
Δr1.57 ± 0.10kcal/molPHPMSHiraoka, Kudaka, et al., 1991gas phase
Quantity Value Units Method Reference Comment
Δr25.7cal/mol*KPHPMSHiraoka, Kudaka, et al., 1991gas phase

(CH5+ • Hydrogen) + Hydrogen = (CH5+ • 2Hydrogen)

By formula: (CH5+ • H2) + H2 = (CH5+ • 2H2)

Quantity Value Units Method Reference Comment
Δr1.78 ± 0.10kcal/molPHPMSHiraoka, Kudaka, et al., 1991gas phase
Quantity Value Units Method Reference Comment
Δr16.2cal/mol*KPHPMSHiraoka, Kudaka, et al., 1991gas phase

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

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

Quantity Value Units Method Reference Comment
Δr2.8 ± 0.2kcal/molPHPMSHiraoka and Mori, 1989gas phase
Quantity Value Units Method Reference Comment
Δr24.8cal/mol*KPHPMSHiraoka and Mori, 1989gas phase

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

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

Quantity Value Units Method Reference Comment
Δr2.7 ± 0.2kcal/molPHPMSHiraoka and Mori, 1989gas phase
Quantity Value Units Method Reference Comment
Δr25.3cal/mol*KPHPMSHiraoka and Mori, 1989gas phase

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

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

Quantity Value Units Method Reference Comment
Δr2.7 ± 0.2kcal/molPHPMSHiraoka and Mori, 1989gas phase
Quantity Value Units Method Reference Comment
Δr26.5cal/mol*KPHPMSHiraoka and Mori, 1989gas phase

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

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

Quantity Value Units Method Reference Comment
Δr2.0 ± 0.2kcal/molPHPMSHiraoka and Mori, 1989gas phase
Quantity Value Units Method Reference Comment
Δr21.6cal/mol*KPHPMSHiraoka and Mori, 1989gas phase

CH5+ + Hydrogen = (CH5+ • Hydrogen)

By formula: CH5+ + H2 = (CH5+ • H2)

Quantity Value Units Method Reference Comment
Δr1.88 ± 0.10kcal/molPHPMSHiraoka, Kudaka, et al., 1991gas phase
Quantity Value Units Method Reference Comment
Δr12.1cal/mol*KPHPMSHiraoka, Kudaka, et al., 1991gas phase

CH5+ + Nitrogen = (CH5+ • Nitrogen)

By formula: CH5+ + N2 = (CH5+ • N2)

Quantity Value Units Method Reference Comment
Δr6.8kcal/molHPMSSpeller, 1983gas phase
Quantity Value Units Method Reference Comment
Δr19.7cal/mol*KHPMSSpeller, 1983gas phase

References

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

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, Kudaka, et al., 1991
Hiraoka, K.; Kudaka, I.; Yamabe, S., Gas-Phase Solvation of CH5+ with H2, Chem. Phys. Lett., 1991, 184, 4, 271, https://doi.org/10.1016/0009-2614(91)85122-D . [all data]

Speller, 1983
Speller, C.V., Ph. D. Thesis, Universite de Paris Sud, 1983. [all data]


Notes

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