Silylene


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 as indicated in comments:
B - John E. Bartmess
M - Michael M. Meot-Ner (Mautner) and Sharon G. Lias

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Individual Reactions

(H3Si- • 4294967295Silylene) + Silylene = H3Si-

By formula: (H3Si- • 4294967295H2Si) + H2Si = H3Si-

Quantity Value Units Method Reference Comment
Δr84.5 ± 1.4kcal/molN/ANimlos and Ellison, 1986gas phase; B
Δr50.6 ± 2.5kcal/molTherBartmess, Scott, et al., 1979gas phase; value altered from reference due to change in acidity scale; B

Iron ion (1+) + Silylene = (Iron ion (1+) • Silylene)

By formula: Fe+ + H2Si = (Fe+ • H2Si)

Quantity Value Units Method Reference Comment
Δr67. ± 12.kcal/molICRJacobson and Bakhtiar, 1993gas phase; M

HSi- + Hydrogen cation = Silylene

By formula: HSi- + H+ = H2Si

Quantity Value Units Method Reference Comment
Δr359.0 ± 2.3kcal/molD-EAKasdan, Herbst, et al., 1975gas 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)200.6kcal/molN/AHunter and Lias, 1998HL
Quantity Value Units Method Reference Comment
Gas basicity192.2kcal/molN/AHunter and Lias, 1998HL
Quantity Value Units Method Reference Comment
Δf(+) ion275.kcal/molN/AN/A 

Electron affinity determinations

EA (eV) Method Reference Comment
1.123 ± 0.022LPESKasdan, Herbst, et al., 1975B

Ionization energy determinations

IE (eV) Method Reference Comment
8.92 ± 0.07ENDBoo and Armentrout, 1987LBLHLM
≤9.15 ± 0.02PIBerkowitz, Greene, et al., 1987LBLHLM
8.244 ± 0.025PIBerkowitz, Greene, et al., 1987LBLHLM
9.41 ± 0.03PIDing, Cassidy, et al., 1985LBLHLM

De-protonation reactions

HSi- + Hydrogen cation = Silylene

By formula: HSi- + H+ = H2Si

Quantity Value Units Method Reference Comment
Δr359.0 ± 2.3kcal/molD-EAKasdan, Herbst, et al., 1975gas 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

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