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
Permanent link for this species. Use this link for bookmarking this species for future reference.
Information on this page:
Other data available:
Data at other public NIST sites:
- Gas Phase Kinetics Database
Options:
- Switch to calorie-based units

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°	1594. ± 8.8	kJ/mol	D-EA	Brinkman, Berger, et al., 1994	gas phase; B
Δ_rH°	1610. ± 17.	kJ/mol	G+TS	Damrauer, Kass, et al., 1988	gas phase; Between furan and methanol.; B
Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	1561. ± 9.2	kJ/mol	H-TS	Brinkman, Berger, et al., 1994	gas phase; B
Δ_rG°	1577. ± 17.	kJ/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°	1643. ± 26.	kJ/mol	G+TS	Damrauer, Kass, et al., 1988	gas phase; Between Me2NH and fluorobenzene; B
Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	1607. ± 25.	kJ/mol	IMRB	Damrauer, Kass, et al., 1988	gas phase; Between Me2NH and fluorobenzene; B

References

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

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
The National Institute of Standards and Technology (NIST) uses its best efforts to deliver a high quality copy of the Database and to verify that the data contained therein have been selected on the basis of sound scientific judgment. However, NIST makes no warranties to that effect, and NIST shall not be liable for any damage that may result from errors or omissions in the Database.
Customer support for NIST Standard Reference Data products.

AE	Appearance energy
Δ_rG°	Free energy of reaction at standard conditions
Δ_rH°	Enthalpy of reaction at standard conditions