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Silane, tetramethyl-

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Gas phase 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.

Quantity Value Units Method Reference Comment
Deltafgas-68.499kcal/molReviewChase, 1998Data last reviewed in December, 1960
Quantity Value Units Method Reference Comment
gas,1 bar86.310cal/mol*KReviewChase, 1998Data last reviewed in December, 1960

Gas Phase Heat Capacity (Shomate Equation)

Cp° = A + B*t + C*t2 + D*t3 + E/t2
H° − H°298.15= A*t + B*t2/2 + C*t3/3 + D*t4/4 − E/t + F − H
S° = A*ln(t) + B*t + C*t2/2 + D*t3/3 − E/(2*t2) + G
    Cp = heat capacity (cal/mol*K)
    H° = standard enthalpy (kcal/mol)
    S° = standard entropy (cal/mol*K)
    t = temperature (K) / 1000.

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Temperature (K) 298. - 1500.
A 9.301401
B 94.97971
C -45.25120
D 8.334850
E -0.064165
F -75.33191
G 70.82500
H -68.50010
ReferenceChase, 1998
Comment Data last reviewed in December, 1960

Condensed phase 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: Eugene S. Domalski and Elizabeth D. Hearing

Quantity Value Units Method Reference Comment
liquid65.019cal/mol*KN/AHarada, Atake, et al., 1977 
liquid66.269cal/mol*KN/AAston, Kennedy, et al., 1941 

Constant pressure heat capacity of liquid

Cp,liquid (cal/mol*K) Temperature (K) Reference Comment
45.373290.Harada, Atake, et al., 1977T = 3 to 300 K.
39.331177.45Shinoda, Enokida, et al., 1973T = 2 to 26 K and 106 to 277.5 K.
47.299290.Aston, Kennedy, et al., 1941T = 11 to 290 K.

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

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

C4H11Si- + Hydrogen cation = Silane, tetramethyl-

By formula: C4H11Si- + H+ = C4H12Si

Quantity Value Units Method Reference Comment
Deltar388.2 ± 3.1kcal/molG+TSDamrauer, Kass, et al., 1988gas phase; Comparable to fluorobenzene; B
Deltar390.9 ± 2.0kcal/molD-EAWetzel and Brauman, 1988gas phase; B
Quantity Value Units Method Reference Comment
Deltar379.0 ± 3.0kcal/molIMRBDamrauer, Kass, et al., 1988gas phase; Comparable to fluorobenzene; B
Deltar381.7 ± 2.1kcal/molH-TSWetzel and Brauman, 1988gas phase; B
Deltar390.7 ± 5.0kcal/molIMRBDePuy and Damrauer, 1984gas phase; B

Fluorine anion + Silane, tetramethyl- = (Fluorine anion bullet Silane, tetramethyl-)

By formula: F- + C4H12Si = (F- bullet C4H12Si)

Quantity Value Units Method Reference Comment
Deltar29.9 ± 2.0kcal/molIMRELarson and McMahon, 1985gas phase; B,M
Quantity Value Units Method Reference Comment
Deltar21.cal/mol*KN/ALarson and McMahon, 1985gas phase; switching reaction,Thermochemical ladder(F-)H2O, Entropy change calculated or estimated; Arshadi, Yamdagni, et al., 1970; M
Quantity Value Units Method Reference Comment
Deltar23.6 ± 2.0kcal/molIMRELarson and McMahon, 1985gas phase; B,M

C3H9Si+ + Silane, tetramethyl- = (C3H9Si+ bullet Silane, tetramethyl-)

By formula: C3H9Si+ + C4H12Si = (C3H9Si+ bullet C4H12Si)

Quantity Value Units Method Reference Comment
Deltar22.3kcal/molPHPMSWojtyniak, Li, et al., 1987gas phase; M
Quantity Value Units Method Reference Comment
Deltar35.2cal/mol*KPHPMSWojtyniak, Li, et al., 1987gas phase; M

References

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Reaction thermochemistry data, Notes

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

Chase, 1998
Chase, M.W., Jr., NIST-JANAF Themochemical Tables, Fourth Edition, J. Phys. Chem. Ref. Data, Monograph 9, 1998, 1-1951. [all data]

Harada, Atake, et al., 1977
Harada, M.; Atake, T.; Chihara, H., Thermodynamic properties of polymorphic phases of tetramethylsilane, J. Chem. Thermodynam., 1977, 9, 523-534. [all data]

Aston, Kennedy, et al., 1941
Aston, J.G.; Kennedy, R.M.; Messerly, G.H., The heat capacity and entropy, heats of fusion and vaporization and the vapor pressure of silicon tetramethyl, J. Am. Chem. Soc., 1941, 63, 2343-2348. [all data]

Shinoda, Enokida, et al., 1973
Shinoda, T.; Enokida, H.; Maeda, Y.; Tomita, H.; Mashiko, Y., Heat capacity of tetramethylsilane in the range from 2 to 26 K and premelting range, Bull. Chem. Soc. Japan, 1973, 46, 48-52. [all data]

Damrauer, Kass, et al., 1988
Damrauer, R.; Kass, S.R.; DePuy, C.H., Gas-Phase Acidities of Methylsilanes: C-H versus Si-H, Organomet., 1988, 7, 3, 637, https://doi.org/10.1021/om00093a011 . [all data]

Wetzel and Brauman, 1988
Wetzel, D.M.; Brauman, J.I., Quantitative Measure of alpha-Silyl Carbanion Stabilization. The Electron Affinity of (Trimethylsilyl)methyl Radical, J. Am. Chem. Soc., 1988, 110, 25, 8333, https://doi.org/10.1021/ja00233a008 . [all data]

DePuy and Damrauer, 1984
DePuy, C.H.; Damrauer, R., Reactions of organosilane anionic species with nitrous oxide, Organometallics, 1984, 3, 362. [all data]

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]

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]

Wojtyniak, Li, et al., 1987
Wojtyniak, A.C.M.; Li, K.; Stone, J.A., The Formation of (CH3)7Si2+ in (CH3)4Si/CH4 Mixtures and CH3- Exchange Reactions Between (CH3)4Si, (CH3)4Ge and (CH3)4Sn Studied by High Pressure Mass Spectrometry, Can. J. Chem., 1987, 65, 12, 2849, https://doi.org/10.1139/v87-473 . [all data]


Notes

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