Silyl radical

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 evaluated as indicated in comments:
L - Sharon G. Lias

Data compiled as indicated in comments:
B - John E. Bartmess
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

View reactions leading to H3Si+ (ion structure unspecified)

Quantity Value Units Method Reference Comment
IE (evaluated)8.135 ± 0.005eVN/AN/AL
Quantity Value Units Method Reference Comment
Δf(+) ion985. ± 3.kJ/molN/AN/A 
Quantity Value Units Method Reference Comment
ΔfH(+) ion,0K992. ± 4.kJ/molN/AN/A 

Electron affinity determinations

EA (eV) Method Reference Comment
1.405 ± 0.026LPDWetzel, Salomon, et al., 1989B
1.406 ± 0.014LPESNimlos and Ellison, 1986B
1.440 ± 0.097D-EABartmess, Scott, et al., 1979value altered from reference due to change in acidity scale; B
<1.440 ± 0.030LPDReed and Brauman, 1974B
1.35734N/ACheck, Faust, et al., 2001MnS-(t); ; ΔS(EA)=5.7; B

Ionization energy determinations

IE (eV) Method Reference Comment
8.17DERNagano, Murthy, et al., 1993LL
8.135 ± 0.005LSJohnson III, Tsai, et al., 1989T = 0K; LL
8.11 ± 0.07ENDBoo and Armentrout, 1987LBLHLM
8.01 ± 0.02PIBerkowitz, Greene, et al., 1987LBLHLM
8.31 ± 0.07PIDing, Cassidy, et al., 1985LBLHLM
8.14 ± 0.01PEDyke, Jonathan, et al., 1983LBLHLM
8.74 ± 0.01PEDyke, Jonathan, et al., 1983Vertical value; LBLHLM

De-protonation reactions

H2Si- + Hydrogen cation = Silyl radical

By formula: H2Si- + H+ = H3Si

Quantity Value Units Method Reference Comment
Δr1495. ± 5.9kJ/molD-EAKasdan, Herbst, et al., 1975gas phase; B


Go To: Top, 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.

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, . [all data]

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]

Reed and Brauman, 1974
Reed, K.J.; Brauman, J.I., Photodetachment of electrons from Group IVa binary hydride anions: The electron affinities of the SiH3 and GeH3 radicals, J. Chem. Phys., 1974, 61, 4830. [all data]

Check, Faust, et al., 2001
Check, C.E.; Faust, T.O.; Bailey, J.M.; Wright, B.J.; Gilbert, T.M.; Sunderlin, L.S., Addition of Polarization and Diffuse Functions to the LANL2DZ Basis Set for P-Block Elements, J. Phys. Chem. A,, 2001, 105, 34, 8111, . [all data]

Nagano, Murthy, et al., 1993
Nagano, Y.; Murthy, S.; Beauchamp, J.L., Thermochemical properties and gas-phase ion chemistry of phenylsilane investigated by FT-ICR spectrometry. Identification of parent- and fragment-ion structural isomers by their specific reactivities, J. Am. Chem. Soc., 1993, 115, 10805. [all data]

Johnson III, Tsai, et al., 1989
Johnson III, R.D.; Tsai, B.P.; Hudgens, J.W., Multiphoton ionization of SiH3 and SID3 radicals: Electronic spectra, vibrational analyses of the ground and Rydberg states, and ionization potentials, J. Chem. Phys., 1989, 91, 3340. [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]

Dyke, Jonathan, et al., 1983
Dyke, J.M.; Jonathan, N.; Morris, A.; Ridha, A.; Winter, M.J., Vacuum ultraviolet photoelectron spectroscopy of transient species. XVII. The SiH3 (X2A1) radical, Chem. Phys., 1983, 81, 481. [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]


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