Silylene
- Formula: H2Si
- Molecular weight: 30.1014
- IUPAC Standard InChIKey: XMIJDTGORVPYLW-UHFFFAOYSA-N
- CAS Registry Number: 13825-90-6
- Chemical structure:
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Reaction thermochemistry data
Go To: Top, Gas phase ion energetics data, 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. 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
(H3Si- • 4294967295) + = H3Si-
By formula: (H3Si- • 4294967295H2Si) + H2Si = H3Si-
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 354. ± 5.9 | kJ/mol | N/A | Nimlos and Ellison, 1986 | gas phase; B |
ΔrH° | 212. ± 10. | kJ/mol | Ther | Bartmess, Scott, et al., 1979 | gas phase; value altered from reference due to change in acidity scale; B |
By formula: Fe+ + H2Si = (Fe+ • H2Si)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 280. ± 50. | kJ/mol | ICR | Jacobson and Bakhtiar, 1993 | gas phase; M |
HSi- + =
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 1502. ± 9.6 | kJ/mol | D-EA | Kasdan, Herbst, et al., 1975 | gas phase; B |
Gas phase ion energetics data
Go To: Top, Reaction thermochemistry data, References, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Data evaluated as indicated in comments:
HL - Edward P. Hunter and Sharon G. Lias
Data compiled as indicated in comments:
B - John E. Bartmess
LBLHLM - Sharon G. Lias, John E. Bartmess, Joel F. Liebman, John L. Holmes, Rhoda D. Levin, and W. Gary Mallard
View reactions leading to H2Si+ (ion structure unspecified)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
Proton affinity (review) | 839.2 | kJ/mol | N/A | Hunter and Lias, 1998 | HL |
Quantity | Value | Units | Method | Reference | Comment |
Gas basicity | 804.1 | kJ/mol | N/A | Hunter and Lias, 1998 | HL |
Quantity | Value | Units | Method | Reference | Comment |
ΔfH°(+) ion | 1150. | kJ/mol | N/A | N/A |
Electron affinity determinations
EA (eV) | Method | Reference | Comment |
---|---|---|---|
1.123 ± 0.022 | LPES | Kasdan, Herbst, et al., 1975 | B |
Ionization energy determinations
IE (eV) | Method | Reference | Comment |
---|---|---|---|
8.92 ± 0.07 | END | Boo and Armentrout, 1987 | LBLHLM |
≤9.15 ± 0.02 | PI | Berkowitz, Greene, et al., 1987 | LBLHLM |
8.244 ± 0.025 | PI | Berkowitz, Greene, et al., 1987 | LBLHLM |
9.41 ± 0.03 | PI | Ding, Cassidy, et al., 1985 | LBLHLM |
De-protonation reactions
HSi- + =
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 1502. ± 9.6 | kJ/mol | D-EA | Kasdan, Herbst, et al., 1975 | gas phase; B |
References
Go To: Top, Reaction thermochemistry data, Gas phase ion energetics data, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Nimlos and Ellison, 1986
Nimlos, M.R.; Ellison, G.B.,
Photoelectron spectroscopy of SiH3- and SiD3-,
J. Am. Chem. Soc., 1986, 108, 6522. [all data]
Bartmess, Scott, et al., 1979
Bartmess, J.E.; Scott, J.A.; McIver, R.T., Jr.,
The gas phase acidity scale from methanol to phenol,
J. Am. Chem. Soc., 1979, 101, 6047. [all data]
Jacobson and Bakhtiar, 1993
Jacobson, D.B.; Bakhtiar, R.,
Generation, Characterization and Properties of Iron-Silylene and Iron-Sylene Cationic Complexes in the Gas Phase,
J. Am. Chem. Soc., 1993, 115, 23, 10830, https://doi.org/10.1021/ja00076a046
. [all data]
Kasdan, Herbst, et al., 1975
Kasdan, A.; Herbst, E.; Lineberger, W.C.,
Laser photoelectron spectrometry of the negative ions of silicon and its hydrides,
J. Chem. Phys., 1975, 62, 541. [all data]
Hunter and Lias, 1998
Hunter, E.P.; Lias, S.G.,
Evaluated Gas Phase Basicities and Proton Affinities of Molecules: An Update,
J. Phys. Chem. Ref. Data, 1998, 27, 3, 413-656, https://doi.org/10.1063/1.556018
. [all data]
Boo and Armentrout, 1987
Boo, B.H.; Armentrout, P.B.,
Reaction of silicon ion (2P) with silane (SiH4, SiD4) heats of formation of SiHn, SiHn+ (n=1,2,3), and Si2Hn+ (n=0,1,2,3) remarkable isotope exchange reaction involving four hydrogen shifts,
J. Am. Chem. Soc., 1987, 109, 3549. [all data]
Berkowitz, Greene, et al., 1987
Berkowitz, J.; Greene, J.P.; Cho, H.; Ruscic, B.,
Photoionization mass spectrometric studies of SiHn (n=1-4),
J. Chem. Phys., 1987, 86, 1235. [all data]
Ding, Cassidy, et al., 1985
Ding, A.; Cassidy, R.; Cordis, L.; Lampe, F.,
The photoionization spectra of effusing and supersonic molecular beams of Mmnosilane,
J. Chem. Phys., 1985, 83, 3426. [all data]
Notes
Go To: Top, Reaction thermochemistry data, Gas phase ion energetics data, References
- Symbols used in this document:
EA Electron affinity ΔrH° Enthalpy of reaction at standard conditions - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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