Disilane


Phase change 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.

Antoine Equation Parameters

log10(P) = A − (B / (T + C))
    P = vapor pressure (atm)
    T = temperature (K)

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Temperature (K) A B C Reference Comment
158.3 to 258.93.83601905.406-23.4Stull, 1947Coefficents calculated by NIST from author's data.

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 by: John E. Bartmess

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Individual Reactions

H5Si2- + Hydrogen cation = Disilane

By formula: H5Si2- + H+ = H6Si2

Quantity Value Units Method Reference Comment
Δr<313.5 ± 2.8kcal/molAcidKrishnakumar and Srivastava, 1991gas phase; From Si2H6, AP = 0.0 eV/Data for SiH4 plus a-Si effects imply ΔHacid ca. 360. G3MP2B3 calculations give dHacid=360 kcal/mol
Quantity Value Units Method Reference Comment
Δr<304.7 ± 3.4kcal/molH-TSKrishnakumar and Srivastava, 1991gas phase; From Si2H6, AP = 0.0 eV/Data for SiH4 plus a-Si effects imply ΔHacid ca. 360. G3MP2B3 calculations give dHacid=360 kcal/mol

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
LLK - Sharon G. Lias, Rhoda D. Levin, and Sherif A. Kafafi
RDSH - Henry M. Rosenstock, Keith Draxl, Bruce W. Steiner, and John T. Herron

Quantity Value Units Method Reference Comment
IE (evaluated)9.74 ± 0.02eVN/AN/AL

Ionization energy determinations

IE (eV) Method Reference Comment
9.74 ± 0.02PIRuscic and Berkowitz, 1991T = 0K; LL
9.9 ± 0.4EIChatham, Hils, et al., 1984LBLHLM
10.0PEPotzinger, Ritter, et al., 1975LLK
10.15 ± 0.10EIPotzinger and Lampe, 1969RDSH
10.6 ± 0.3EISaalfeld and Svec, 1963RDSH
10.53PEBock, Ensslin, et al., 1976Vertical value; LLK
10.53PEEnsslin, Bock, et al., 1974Vertical value; LLK

Appearance energy determinations

Ion AE (eV) Other Products MethodReferenceComment
HSi+14. ± 2.?EIChatham, Hils, et al., 1984LBLHLM
HSi2+≤15.0?PIRuscic and Berkowitz, 1991T = 0K; LL
HSi2+15. ± 2.?EIChatham, Hils, et al., 1984LBLHLM
Si2H+12.9 ± 0.22H2+HEIPotzinger and Lampe, 1969RDSH
H2Si+10. ± 2.?EIChatham, Hils, et al., 1984LBLHLM
H2Si+12.0 ± 0.1SiH4EIPotzinger, Ritter, et al., 1975LLK
SiH2+11.95 ± 0.10SiH4EIPotzinger and Lampe, 1969RDSH
SiH2+11.94 ± 0.04SiH4EISteele and Stone, 1962RDSH
H2Si2+≤11.57 ± 0.03?PIRuscic and Berkowitz, 1991T = 0K; LL
H2Si2+11.5 ± 0.4?EIChatham, Hils, et al., 1984LBLHLM
Si2H2+11.80 ± 0.102H2EIPotzinger and Lampe, 1969RDSH
H3Si+≤11.72 ± 0.02?PIRuscic and Berkowitz, 1991T = 0K; LL
H3Si+11. ± 2.?EIChatham, Hils, et al., 1984LBLHLM
H3Si+11.8 ± 0.1SiH3EIPotzinger, Ritter, et al., 1975LLK
SiH3+11.95 ± 0.15SiH3EIPotzinger and Lampe, 1969RDSH
SiH3+11.31 ± 0.12SiH3EISaalfeld and Svec, 1966RDSH
SiH3+11.3 ± 0.2SiH3EISaalfeld and Svec, 1964RDSH
SiH3+11.85 ± 0.05SiH3EISteele and Stone, 1962RDSH
H3Si2+≤12.70?PIRuscic and Berkowitz, 1991T = 0K; LL
H3Si2+12. ± 1.?EIChatham, Hils, et al., 1984LBLHLM
Si2H3+12.50 ± 0.10H2+HEIPotzinger and Lampe, 1969RDSH
H4Si+11.4 ± 0.1HEIPotzinger, Ritter, et al., 1975LLK
H4Si2+10.8 ± 0.4?EIChatham, Hils, et al., 1984LBLHLM
Si2H4+10.85 ± 0.10H2EIPotzinger and Lampe, 1969RDSH
H4Si2+[H2SiSiH2+]≤10.04 ± 0.02H2PIRuscic and Berkowitz, 1991T = 0K; LL
H4Si2+[H3SiSiH+]≤10.81 ± 0.02H2PIRuscic and Berkowitz, 1991T = 0K; LL
H5Si2+11.41 ± 0.03HPIRuscic and Berkowitz, 1991T = 0K; LL
H5Si2+11.2 ± 0.4HEIChatham, Hils, et al., 1984LBLHLM
Si2H5+11.40 ± 0.10HEIPotzinger and Lampe, 1969RDSH
Si+15. ± 2.?EIChatham, Hils, et al., 1984LBLHLM
Si+15.2 ± 0.3?EISaalfeld and Svec, 1963RDSH
Si2+≤14.5?PIRuscic and Berkowitz, 1991T = 0K; LL
Si2+18. ± 3.?EIChatham, Hils, et al., 1984LBLHLM
Si2+13.0?EIPotzinger and Lampe, 1969RDSH
Si2+12.2 ± 0.3?EISaalfeld and Svec, 1963RDSH

De-protonation reactions

H5Si2- + Hydrogen cation = Disilane

By formula: H5Si2- + H+ = H6Si2

Quantity Value Units Method Reference Comment
Δr<313.5 ± 2.8kcal/molAcidKrishnakumar and Srivastava, 1991gas phase; From Si2H6, AP = 0.0 eV/Data for SiH4 plus a-Si effects imply ΔHacid ca. 360. G3MP2B3 calculations give dHacid=360 kcal/mol; B
Quantity Value Units Method Reference Comment
Δr<304.7 ± 3.4kcal/molH-TSKrishnakumar and Srivastava, 1991gas phase; From Si2H6, AP = 0.0 eV/Data for SiH4 plus a-Si effects imply ΔHacid ca. 360. G3MP2B3 calculations give dHacid=360 kcal/mol; B

References

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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Stull, 1947
Stull, Daniel R., Vapor Pressure of Pure Substances. Organic and Inorganic Compounds, Ind. Eng. Chem., 1947, 39, 4, 517-540, https://doi.org/10.1021/ie50448a022 . [all data]

Krishnakumar and Srivastava, 1991
Krishnakumar, E.; Srivastava, S.K., Dissociative Electron Attachment of Electrons with Si2H6, Int. J. Mass Spectrom. Ion Proc., 1991, 103, 2-3, 107, https://doi.org/10.1016/0168-1176(91)80082-X . [all data]

Ruscic and Berkowitz, 1991
Ruscic, B.; Berkowitz, J., Photoionization mass spectrometric study of Si2H6, J. Chem. Phys., 1991, 95, 2407. [all data]

Chatham, Hils, et al., 1984
Chatham, H.; Hils, D.; Robertson, R.; Gallagher, A., Total and partial electron collisional ionization cross sections for CH4, C2H6, SiH4, and Si2H6, J. Chem. Phys., 1984, 81, 1770. [all data]

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]

Potzinger and Lampe, 1969
Potzinger, P.; Lampe, F.W., An electron impact study of ionization and dissociation of monosilane and disilane, J. Phys. Chem., 1969, 73, 3912. [all data]

Saalfeld and Svec, 1963
Saalfeld, F.E.; Svec, H.J., The mass spectra of volatile hydrides. II. Some higher hydrides of the group IVB and VB elements, Inorg. Chem., 1963, 2, 50. [all data]

Bock, Ensslin, et al., 1976
Bock, H.; Ensslin, W.; Feher, F.; Freund, R., Photoelectron spectra and molecular properties. LI. Ionization potentials of silanes SinH2n+2, J. Am. Chem. Soc., 1976, 98, 668. [all data]

Ensslin, Bock, et al., 1974
Ensslin, W.; Bock, H.; Becker, G., Photoelectron spectra and molecular properties. XXX. π interactions in H3Si- H3C-substituted acetylenes, J. Am. Chem. Soc., 1974, 96, 2757. [all data]

Steele and Stone, 1962
Steele, W.C.; Stone, F.G.A., Silicon-silicon bond dissociation energies in disilane and hexachlorodisilane, J. Am. Chem. Soc., 1962, 84, 3599. [all data]

Saalfeld and Svec, 1966
Saalfeld, F.E.; Svec, H.J., Mass spectra of volatile hydrides. IV. Silylgermane, J. Phys. Chem., 1966, 70, 1753. [all data]

Saalfeld and Svec, 1964
Saalfeld, F.E.; Svec, H.J., Mass spectra of volatile hydrides. III. Silylphosphine, Inorg. Chem., 1964, 3, 1442. [all data]


Notes

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