Silane, dimethyl-

Formula: C₂H₈Si
Molecular weight: 60.1704
IUPAC Standard InChI: InChI=1S/C2H8Si/c1-3-2/h3H2,1-2H3
IUPAC Standard InChIKey: UBHZUDXTHNMNLD-UHFFFAOYSA-N
CAS Registry Number: 1111-74-6
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: Dimethylsilane; 2-Silapropane; (CH3)2SiH2
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Other data available:
Data at other public NIST sites:
- Gas Phase Kinetics Database
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Gas phase ion energetics data

Data compiled as indicated in comments:
B - John E. Bartmess
LLK - Sharon G. Lias, Rhoda D. Levin, and Sherif A. Kafafi
LL - Sharon G. Lias and Joel F. Liebman
LBLHLM - Sharon G. Lias, John E. Bartmess, Joel F. Liebman, John L. Holmes, Rhoda D. Levin, and W. Gary Mallard
RDSH - Henry M. Rosenstock, Keith Draxl, Bruce W. Steiner, and John T. Herron

View reactions leading to C₂H₈Si⁺ (ion structure unspecified)

Ionization energy determinations

IE (eV)	Method	Reference	Comment
10.3	PE	Potzinger, Ritter, et al., 1975	LLK
11.2	PE	Roberge, Sandorfy, et al., 1978	Vertical value; LLK

Appearance energy determinations

Ion	AE (eV)	Other Products	Method	Reference	Comment
CH₃Si⁺	14.0	?	EI	Lango, Szepes, et al., 1984	LBLHLM
CH₃Si⁺	14.00 ± 0.15	?	EI	Potzinger and Lampe, 1970	RDSH
CH₄Si⁺	10.63 ± 0.03	CH₄	PI	Shin, Corderman, et al., 1990	LL
CH₄Si⁺	11.0	CH₃+H/CH₄	EI	Lango, Szepes, et al., 1984	LBLHLM
CH₄Si⁺	11.1 ± 0.1	CH₄	EI	Potzinger, Ritter, et al., 1975	LLK
CH₄Si⁺	10.85 ± 0.05	?	EI	Potzinger and Lampe, 1970	RDSH
CH₅Si⁺	11.5	CH₃	EI	Lango, Szepes, et al., 1984	LBLHLM
CH₅Si⁺	11.5 ± 0.1	CH₃	EI	Potzinger, Ritter, et al., 1975	LLK
CH₅Si⁺	11.51 ± 0.05	CH₃	EI	Potzinger and Lampe, 1970	RDSH
C₂H₆Si⁺	10.41 ± 0.03	H₂	PI	Shin, Corderman, et al., 1990	LL
C₂H₆Si⁺	10.9	H₂	EI	Lango, Szepes, et al., 1984	LBLHLM
C₂H₆Si⁺	10.7 ± 0.1	H₂	EI	Potzinger, Ritter, et al., 1975	LLK
C₂H₆Si⁺	10.71 ± 0.05	H₂	EI	Potzinger and Lampe, 1970	RDSH
C₂H₇Si⁺	10.78 ± 0.05	H	PI	Shin, Corderman, et al., 1990	LL
C₂H₇Si⁺	11.1	H	EI	Lango, Szepes, et al., 1984	LBLHLM
C₂H₇Si⁺	11.1 ± 0.1	H	EI	Potzinger, Ritter, et al., 1975	LLK
C₂H₇Si⁺	11.12 ± 0.05	H	EI	Potzinger and Lampe, 1970	RDSH
C₂H₇Si⁺	11.94 ± 0.04	H	EI	Hess, Lampe, et al., 1965	RDSH
C₂H₈Si⁺	10.7	?	EI	Lango, Szepes, et al., 1984	LBLHLM
Si⁺	14.5	?	EI	Lango, Szepes, et al., 1984	LBLHLM

De-protonation reactions

C₂H₇Si^- + = Silane, dimethyl-

By formula: C₂H₇Si^- + H⁺ = C₂H₈Si

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	380.9 ± 2.1	kcal/mol	D-EA	Brinkman, Berger, et al., 1994	gas phase; B
Δ_rH°	384.7 ± 4.1	kcal/mol	G+TS	Damrauer, Kass, et al., 1988	gas phase; Between furan and methanol.; B
Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	373.1 ± 2.2	kcal/mol	H-TS	Brinkman, Berger, et al., 1994	gas phase; B
Δ_rG°	377.0 ± 4.0	kcal/mol	IMRB	Damrauer, Kass, et al., 1988	gas phase; Between furan and methanol.; B

C₂H₇Si^- + = Silane, dimethyl-

By formula: C₂H₇Si^- + H⁺ = C₂H₈Si

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	392.8 ± 6.1	kcal/mol	G+TS	Damrauer, Kass, et al., 1988	gas phase; Between Me2NH and fluorobenzene; B
Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	384.0 ± 6.0	kcal/mol	IMRB	Damrauer, Kass, et al., 1988	gas phase; Between Me2NH and fluorobenzene; B

References

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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]

Lango, Szepes, et al., 1984
Lango, J.; Szepes, L.; Csaszar, P.; Innorta, G., Studies on the unimolecular decomposition processes of organometallic ions, J. Organomet. Chem., 1984, 269, 133. [all data]

Potzinger and Lampe, 1970
Potzinger, P.; Lampe, F.W., Thermochemistry of simple alkylsilanes, J. Phys. Chem., 1970, 74, 719. [all data]

Shin, Corderman, et al., 1990
Shin, S.K.; Corderman, R.R.; Beauchamp, J.L., Photoionization mass spectrometric studies of the methylsilanes Si(CH₃)_nH_4-n (n = 0-3), Int. J. Mass Spectrom. Ion Processes, 1990, 101, 257. [all data]

Hess, Lampe, et al., 1965
Hess, G.G.; Lampe, F.W.; Sommer, L.H., An electron impact study of ionization and dissociation of trimethylsilanes, J. Am. Chem. Soc., 1965, 87, 5327. [all data]

Brinkman, Berger, et al., 1994
Brinkman, E.A.; Berger, S.; Brauman, J.I., alpha-Silyl-substituent stabilization of carbanions and silyl anions, J. Am. Chem. Soc., 1994, 116, 18, 8304, https://doi.org/10.1021/ja00097a042 . [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]

Notes

Go To: Top, Gas phase ion energetics data, References

Symbols used in this document:

AE Appearance energy

Δ_rG° Free energy of reaction at standard conditions

Δ_rH° Enthalpy of reaction at standard conditions
Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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AE	Appearance energy
Δ_rG°	Free energy of reaction at standard conditions
Δ_rH°	Enthalpy of reaction at standard conditions