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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-286.60kJ/molReviewChase, 1998Data last reviewed in December, 1960
Quantity Value Units Method Reference Comment
gas,1 bar361.12J/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 (J/mol*K)
    H° = standard enthalpy (kJ/mol)
    S° = standard entropy (J/mol*K)
    t = temperature (K) / 1000.

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Temperature (K) 298. - 1500.
A 38.91706
B 397.3951
C -189.3310
D 34.87301
E -0.268466
F -315.1887
G 296.3318
H -286.6044
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
liquid272.04J/mol*KN/AHarada, Atake, et al., 1977 
liquid277.27J/mol*KN/AAston, Kennedy, et al., 1941 

Constant pressure heat capacity of liquid

Cp,liquid (J/mol*K) Temperature (K) Reference Comment
189.84290.Harada, Atake, et al., 1977T = 3 to 300 K.
164.56177.45Shinoda, Enokida, et al., 1973T = 2 to 26 K and 106 to 277.5 K.
197.90290.Aston, Kennedy, et al., 1941T = 11 to 290 K.

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.

Data compiled as indicated in comments:
BS - Robert L. Brown and Stephen E. Stein
TRC - Thermodynamics Research Center, NIST Boulder Laboratories, Kenneth Kroenlein director
AC - William E. Acree, Jr., James S. Chickos
DH - Eugene S. Domalski and Elizabeth D. Hearing

Quantity Value Units Method Reference Comment
Tboil299.7KN/APCR Inc., 1990BS
Tboil299.KN/ASommer, Goldberg, et al., 1946Uncertainty assigned by TRC = 3. K; ~; TRC
Quantity Value Units Method Reference Comment
Ttriple172. ± 5.KAVGN/AAverage of 7 values; Individual data points
Quantity Value Units Method Reference Comment
Tc448.640KN/AMcGlashan and McKinnon, 1977Uncertainty assigned by TRC = 0.03 K; TRC
Quantity Value Units Method Reference Comment
Pc28.21barN/AMcGlashan and McKinnon, 1977Uncertainty assigned by TRC = 0.01 bar; TRC
Quantity Value Units Method Reference Comment
Vc0.362l/molN/AMcGlashan and McKinnon, 1977Uncertainty assigned by TRC = 0.008 l/mol; TRC
Quantity Value Units Method Reference Comment
Deltavap26.0 ± 0.6kJ/molCVoronkov, Baryshok, et al., 1988AC

Enthalpy of vaporization

DeltavapH (kJ/mol) Temperature (K) Method Reference Comment
24.204299.80N/AAston, Kennedy, et al., 1941P = 101.325 kPa; DH
24.2 ± 0.1299.CBergmann and Haskelberg, 1941AC

Entropy of vaporization

DeltavapS (J/mol*K) Temperature (K) Reference Comment
80.73299.80Aston, Kennedy, et al., 1941P; DH

Antoine Equation Parameters

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

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Temperature (K) A B C Reference Comment
208.93 - 293.643.977031047.272-36.057Aston, Kennedy, et al., 1941Coefficents calculated by NIST from author's data.

Enthalpy of fusion

DeltafusH (kJ/mol) Temperature (K) Reference Comment
6.74174.Domalski and Hearing, 1996AC

Enthalpy of phase transition

DeltaHtrs (kJ/mol) Temperature (K) Initial Phase Final Phase Reference Comment
0.703165.920crystaline, «alpha»liquidHarada, Atake, et al., 1977DH
5.878171.016crystaline, «beta»liquidHarada, Atake, et al., 1977DH
5.840970.983crystaline, IIliquidShinoda, Enokida, et al., 1973Metastable form.; DH
6.7413174.049crystaline, IliquidShinoda, Enokida, et al., 1973Stable form.; DH
5.9697171.04crystaline, IliquidAston, Kennedy, et al., 1941DH
6.895174.12crystaline, IIliquidAston, Kennedy, et al., 1941DH

Entropy of phase transition

DeltaStrs (J/mol*K) Temperature (K) Initial Phase Final Phase Reference Comment
4.24165.920crystaline, «alpha»liquidHarada, Atake, et al., 1977DH
34.37171.016crystaline, «beta»liquidHarada, Atake, et al., 1977DH
34.1670.983crystaline, IIliquidShinoda, Enokida, et al., 1973Metastable; DH
38.73174.049crystaline, IliquidShinoda, Enokida, et al., 1973Stable; DH
34.90171.04crystaline, IliquidAston, Kennedy, et al., 1941DH
39.60174.12crystaline, IIliquidAston, Kennedy, et al., 1941DH

In addition to the Thermodynamics Research Center (TRC) data available from this site, much more physical and chemical property data is available from the following TRC products:


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
Deltar1624. ± 13.kJ/molG+TSDamrauer, Kass, et al., 1988gas phase; Comparable to fluorobenzene; B
Deltar1636. ± 8.4kJ/molD-EAWetzel and Brauman, 1988gas phase; B
Quantity Value Units Method Reference Comment
Deltar1586. ± 13.kJ/molIMRBDamrauer, Kass, et al., 1988gas phase; Comparable to fluorobenzene; B
Deltar1597. ± 8.8kJ/molH-TSWetzel and Brauman, 1988gas phase; B
Deltar1635. ± 21.kJ/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
Deltar125. ± 8.4kJ/molIMRELarson and McMahon, 1985gas phase; B,M
Quantity Value Units Method Reference Comment
Deltar88.J/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
Deltar98.7 ± 8.4kJ/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
Deltar93.3kJ/molPHPMSWojtyniak, Li, et al., 1987gas phase; M
Quantity Value Units Method Reference Comment
Deltar147.J/mol*KPHPMSWojtyniak, Li, et al., 1987gas phase; M

IR Spectrum

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Reaction thermochemistry data, Mass spectrum (electron ionization), References, Notes

Data compiled by: Coblentz Society, Inc.

Data compiled by: NIST Mass Spectrometry Data Center, William E. Wallace, director


Mass spectrum (electron ionization)

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Reaction thermochemistry data, IR Spectrum, References, Notes

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

Data compiled by: NIST Mass Spectrometry Data Center, William E. Wallace, director

Spectrum

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Mass spectrum
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Additional Data

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Owner NIST Mass Spectrometry Data Center
Collection (C) 2014 copyright by the U.S. Secretary of Commerce
on behalf of the United States of America. All rights reserved.
Origin R.W.CRAWFORD UNIV. OF CALIFORNIA, LIVERMORE, CALIFORNIA, USA
NIST MS number 19500

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References

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Reaction thermochemistry data, IR Spectrum, Mass spectrum (electron ionization), 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]

PCR Inc., 1990
PCR Inc., Research Chemicals Catalog 1990-1991, PCR Inc., Gainesville, FL, 1990, 1. [all data]

Sommer, Goldberg, et al., 1946
Sommer, L.H.; Goldberg, G.M.; Derfman, E.; Whitmore, F.C., Organisilicaon Compounds V. «beta»-Elimination Involving Silicon, J. Am. Chem. Soc., 1946, 68, 1083. [all data]

McGlashan and McKinnon, 1977
McGlashan, M.L.; McKinnon, I.R., The vapor pressure, orthobaric volumes, and critical constants of tetramethylsilane, J. Chem. Thermodyn., 1977, 9, 1205-12. [all data]

Voronkov, Baryshok, et al., 1988
Voronkov, M.G.; Baryshok, V.P.; Klyuchnikov, V.A.; Danilova, T.F.; Pepekin, V.I.; Korchagina, A.N.; Khudobin, Yu.I., Thermochemistry of organosilicon compounds, Journal of Organometallic Chemistry, 1988, 345, 1-2, 27-38, https://doi.org/10.1016/0022-328X(88)80231-6 . [all data]

Bergmann and Haskelberg, 1941
Bergmann, F.; Haskelberg, L., Synthesis of Lipophilic Chemotherapeuticals. V. N 4 -Acyl-sulfanilamides 1a, J. Am. Chem. Soc., 1941, 63, 8, 2243-2245, https://doi.org/10.1021/ja01853a062 . [all data]

Domalski and Hearing, 1996
Domalski, Eugene S.; Hearing, Elizabeth D., Heat Capacities and Entropies of Organic Compounds in the Condensed Phase. Volume III, J. Phys. Chem. Ref. Data, 1996, 25, 1, 1, https://doi.org/10.1063/1.555985 . [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

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Reaction thermochemistry data, IR Spectrum, Mass spectrum (electron ionization), References