Silane, methyl-


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: John E. Bartmess

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Individual Reactions

CH5Si- + Hydrogen cation = Silane, methyl-

By formula: CH5Si- + H+ = CH6Si

Quantity Value Units Method Reference Comment
Δr377.4 ± 2.1kcal/molG+TSGal, Decouzon, et al., 2001gas phase
Δr378.0 ± 3.0kcal/molD-EAWetzel, Salomon, et al., 1989gas phase
Δr378.0 ± 2.1kcal/molG+TSWetzel, Salomon, et al., 1989gas phase; 0.8 kcal/mol weaker than iPrOH; value altered from reference due to change in acidity scale
Δr385.4 ± 4.1kcal/molG+TSDamrauer, Kass, et al., 1988gas phase; Between furan and methanol.
Quantity Value Units Method Reference Comment
Δr369.0 ± 2.0kcal/molIMREGal, Decouzon, et al., 2001gas phase
Δr369.6 ± 3.1kcal/molH-TSWetzel, Salomon, et al., 1989gas phase
Δr369.6 ± 2.0kcal/molIMREWetzel, Salomon, et al., 1989gas phase; 0.8 kcal/mol weaker than iPrOH; value altered from reference due to change in acidity scale
Δr377.0 ± 4.0kcal/molIMRBDamrauer, Kass, et al., 1988gas phase; Between furan and methanol.

CH5Si- + Hydrogen cation = Silane, methyl-

By formula: CH5Si- + H+ = CH6Si

Quantity Value Units Method Reference Comment
Δr388.4 ± 4.1kcal/molG+TSDamrauer, Kass, et al., 1988gas phase; Slightly less acidic then fluorobenzene
Quantity Value Units Method Reference Comment
Δr380.0 ± 4.0kcal/molIMRBDamrauer, Kass, et al., 1988gas phase; Slightly less acidic then fluorobenzene

Gas phase ion energetics 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:
B - John E. Bartmess
LLK - Sharon G. Lias, Rhoda D. Levin, and Sherif A. Kafafi
RDSH - Henry M. Rosenstock, Keith Draxl, Bruce W. Steiner, and John T. Herron

Ionization energy determinations

IE (eV) Method Reference Comment
10.7PEPotzinger, Ritter, et al., 1975LLK
11.6PERoberge, Sandorfy, et al., 1978Vertical value; LLK

Appearance energy determinations

Ion AE (eV) Other Products MethodReferenceComment
CH3+15.1 ± 0.3?EISteele, Nichols, et al., 1962RDSH
CH3Si+12.8?EIBradshaw, Moyes, et al., 1976LLK
CH3Si+14.05 ± 0.05H2+HEIPotzinger and Lampe, 1970RDSH
CH4Si+11.3?EIBradshaw, Moyes, et al., 1976LLK
CH4Si+11.4 ± 0.1H2EIPotzinger, Ritter, et al., 1975LLK
CH4Si+11.45 ± 0.05H2EIPotzinger and Lampe, 1970RDSH
CH5Si+11.8HEIBradshaw, Moyes, et al., 1976LLK
CH5Si+11.8 ± 0.1HEIPotzinger, Ritter, et al., 1975LLK
CH5Si+11.80 ± 0.05HEIPotzinger and Lampe, 1970RDSH
HSi+14.8?EIBradshaw, Moyes, et al., 1976LLK
H2Si+11.7CH4EIBradshaw, Moyes, et al., 1976LLK
H2Si+11.5 ± 0.1CH4EIPotzinger, Ritter, et al., 1975LLK
SiH2+11.50 ± 0.05CH4EIPotzinger and Lampe, 1970RDSH
SiH2+11.6 ± 0.1CH4EISteele, Nichols, et al., 1962RDSH
H3Si+12.5?EIBradshaw, Moyes, et al., 1976LLK
SiH3+12.8 ± 0.1CH3EISteele, Nichols, et al., 1962RDSH
Si+12.1?EIBradshaw, Moyes, et al., 1976LLK

De-protonation reactions

CH5Si- + Hydrogen cation = Silane, methyl-

By formula: CH5Si- + H+ = CH6Si

Quantity Value Units Method Reference Comment
Δr377.4 ± 2.1kcal/molG+TSGal, Decouzon, et al., 2001gas phase; B
Δr378.0 ± 3.0kcal/molD-EAWetzel, Salomon, et al., 1989gas phase; B
Δr378.0 ± 2.1kcal/molG+TSWetzel, Salomon, et al., 1989gas phase; 0.8 kcal/mol weaker than iPrOH; value altered from reference due to change in acidity scale; B
Δr385.4 ± 4.1kcal/molG+TSDamrauer, Kass, et al., 1988gas phase; Between furan and methanol.; B
Quantity Value Units Method Reference Comment
Δr369.0 ± 2.0kcal/molIMREGal, Decouzon, et al., 2001gas phase; B
Δr369.6 ± 3.1kcal/molH-TSWetzel, Salomon, et al., 1989gas phase; B
Δr369.6 ± 2.0kcal/molIMREWetzel, Salomon, et al., 1989gas phase; 0.8 kcal/mol weaker than iPrOH; value altered from reference due to change in acidity scale; B
Δr377.0 ± 4.0kcal/molIMRBDamrauer, Kass, et al., 1988gas phase; Between furan and methanol.; B

CH5Si- + Hydrogen cation = Silane, methyl-

By formula: CH5Si- + H+ = CH6Si

Quantity Value Units Method Reference Comment
Δr388.4 ± 4.1kcal/molG+TSDamrauer, Kass, et al., 1988gas phase; Slightly less acidic then fluorobenzene; B
Quantity Value Units Method Reference Comment
Δr380.0 ± 4.0kcal/molIMRBDamrauer, Kass, et al., 1988gas phase; Slightly less acidic then fluorobenzene; B

IR Spectrum

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Data compiled by: Coblentz Society, Inc.


Mass spectrum (electron ionization)

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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: NIST Mass Spectrometry Data Center, William E. Wallace, director

Spectrum

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Mass 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 R.W.CRAWFORD UNIV. OF CALIFORNIA, LIVERMORE, CALIFORNIA, USA
NIST MS number 80

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References

Go To: Top, Reaction thermochemistry data, Gas phase ion energetics data, IR Spectrum, Mass spectrum (electron ionization), Notes

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

Gal, Decouzon, et al., 2001
Gal, J.F.; Decouzon, M.; Maria, P.C.; Gonzalez, A.I.; Mo, O.; Yanez, M.; El Chaouch, S.; Guillemin, J.C., Acidity trends in alpha,beta-unsaturated alkanes, silanes, germanes, and stannanes, J. Am. Chem. Soc., 2001, 123, 26, 6353-6359, https://doi.org/10.1021/ja004079j . [all data]

Wetzel, Salomon, et al., 1989
Wetzel, D.M.; Salomon, K.E.; Berger, S.; Brauman, J.I., Gas-Phase Acidities of Organosilanes and Electron Affinities of Organosilyl Radicals, J. Am. Chem. Soc., 1989, 111, 11, 3835, https://doi.org/10.1021/ja00193a013 . [all data]

Damrauer, Kass, et al., 1988
Damrauer, R.; Kass, S.R.; DePuy, C.H., Gas-Phase Acidities of Methylsilanes: C-H versus Si-H, Organomet., 1988, 7, 3, 637, https://doi.org/10.1021/om00093a011 . [all data]

Potzinger, Ritter, et al., 1975
Potzinger, P.; Ritter, A.; Krause, J., Massenspektrometrische Bestimmung von Bindungsenergien in siliciumorganischen Verbindungen, Z. Naturforsch. A:, 1975, 30, 347. [all data]

Roberge, Sandorfy, et al., 1978
Roberge, R.; Sandorfy, C.; Matthews, J.I.; Strausz, O.P., The far ultraviolet HeI photoelectron spectra of alkyl and fluorine substituted silane derivatives, J. Chem. Phys., 1978, 69, 5105. [all data]

Steele, Nichols, et al., 1962
Steele, W.C.; Nichols, L.D.; Stone, F.G.A., The determination of silicon-carbon and silicon-hydrogen bond dissociation energies by electron impact, J. Am. Chem. Soc., 1962, 84, 4441. [all data]

Bradshaw, Moyes, et al., 1976
Bradshaw, D.I.; Moyes, R.B.; Wells, P.B., Mass spectra of some deuterium-labelled methylsilanes the analysis of mixtures, Can. J. Chem., 1976, 54, 599. [all data]

Potzinger and Lampe, 1970
Potzinger, P.; Lampe, F.W., Ionic reactions in gaseous methylsilane, J. Phys. Chem., 1970, 74, 587. [all data]


Notes

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