- Formula: C3H9FSi
- Molecular weight: 92.1875
- IUPAC Standard InChI:
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- IUPAC Standard InChIKey: CTIKAHQFRQTTAY-UHFFFAOYSA-N
- CAS Registry Number: 420-56-4
- Chemical structure:
This structure is also available as a 2d Mol file or as a computed 3d SD file
- Other names: Silane, fluorotrimethyl-; Fluorotrimethylsilane; Trimethylfluorosilane; Trimethylsilicon fluoride; (CH3)3SiF; Ffluorotrimethylsilane
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- Other data available:
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Reaction thermochemistry data
Go To: Top, 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.
+ = ( )
By formula: F- + C3H9FSi = (F- C3H9FSi)
|rH°||38.2 ± 2.0||kcal/mol||IMRE||Larson and McMahon, 1985||gas phase; These relative affinities are ca. 10 kcal/mol weaker than threshold values (see Wenthold and Squires, 1995) for donors greater than ca. 27 kcal/mol in free energy. This discrepancy has not yet been resolved, though the stronger value appears preferable.; B,M|
|rH°||<54. ± 10.||kcal/mol||IMRB||Murphy and Beauchamp, 1977||gas phase; B|
|rS°||22.||cal/mol*K||N/A||Larson and McMahon, 1985||gas phase; switching reaction,Thermochemical ladder(F-)H2O, Entropy change calculated or estimated; Arshadi, Yamdagni, et al., 1970; M|
|rG°||31.6 ± 2.0||kcal/mol||IMRE||Larson and McMahon, 1985||gas phase; These relative affinities are ca. 10 kcal/mol weaker than threshold values (see Wenthold and Squires, 1995) for donors greater than ca. 27 kcal/mol in free energy. This discrepancy has not yet been resolved, though the stronger value appears preferable.; B,M|
C3H8FSi- + =
By formula: C3H8FSi- + H+ = C3H9FSi
|rH°||388.5 ± 4.7||kcal/mol||G+TS||Allison and McMahon, 1990||gas phase; Between H2O, HO.; B|
|rG°||380.2 ± 4.6||kcal/mol||IMRB||Allison and McMahon, 1990||gas phase; Between H2O, HO.; B|
Go To: Top, Reaction thermochemistry data, Notes
Larson and McMahon, 1985
Larson, J.W.; McMahon, T.B., Fluoride and chloride affinities of the main group oxides, fluorides, oxofluorides, and alkyls. Quantitative scales of lewis acidities from ICR halide exchange equilibria, J. Am. Chem. Soc., 1985, 107, 766. [all data]
Wenthold and Squires, 1995
Wenthold, P.G.; Squires, R.R., Bond dissociation energies of F2(-) and HF2(-). A gas-phase experimental and G2 theoretical study, J. Phys. Chem., 1995, 99, 7, 2002, https://doi.org/10.1021/j100007a034 . [all data]
Murphy and Beauchamp, 1977
Murphy, M.K.; Beauchamp, J.L., Methyl and Fluorine Substituent Effects on the Gas Phase Lewis Acidities of Silanes by ICR Spectroscopy, J. Am. Chem. Soc., 1977, 99, 15, 4992, https://doi.org/10.1021/ja00457a017 . [all data]
Arshadi, Yamdagni, et al., 1970
Arshadi, M.; Yamdagni, R.; Kebarle, P., Hydration of Halide Negative Ions in the Gas Phase. II. Comparison of Hydration Energies for the Alkali Positive and Halide Negative Ions, J. Phys. Chem., 1970, 74, 7, 1475, https://doi.org/10.1021/j100702a014 . [all data]
Allison and McMahon, 1990
Allison, C.E.; McMahon, T.B., How Strong is the Si=C Bond in Fluoro- and Methyl Substituted Silaethylenes? An Experimental Determination of Pi Bond Strengths, J. Am. Chem. Soc., 1990, 112, 5, 1672, https://doi.org/10.1021/ja00161a002 . [all data]
Go To: Top, Reaction thermochemistry data, References
- Symbols used in this document:
rG° Free energy of reaction at standard conditions rH° Enthalpy of reaction at standard conditions rS° Entropy of reaction at standard conditions
- Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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