Silane, tetramethyl-
- Formula: C4H12Si
- Molecular weight: 88.2236
- IUPAC Standard InChIKey: CZDYPVPMEAXLPK-UHFFFAOYSA-N
- CAS Registry Number: 75-76-3
- Chemical structure:
This structure is also available as a 2d Mol file or as a computed 3d SD file
The 3d structure may be viewed using Java or Javascript. - Other names: Tetramethylsilane; (CH3)4Si; Silicon, tetramethyl-; Tetramethylsilicane; UN 2749; Si(CH3)4; CT2050; TMS; NSC 5210; T2050
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Condensed phase thermochemistry data
Go To: Top, Phase change data, 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: Eugene S. Domalski and Elizabeth D. Hearing
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
S°liquid | 272.04 | J/mol*K | N/A | Harada, Atake, et al., 1977 | |
S°liquid | 277.27 | J/mol*K | N/A | Aston, Kennedy, et al., 1941 |
Constant pressure heat capacity of liquid
Cp,liquid (J/mol*K) | Temperature (K) | Reference | Comment |
---|---|---|---|
189.84 | 290. | Harada, Atake, et al., 1977 | T = 3 to 300 K. |
164.56 | 177.45 | Shinoda, Enokida, et al., 1973 | T = 2 to 26 K and 106 to 277.5 K. |
197.90 | 290. | Aston, Kennedy, et al., 1941 | T = 11 to 290 K. |
Phase change data
Go To: Top, Condensed phase thermochemistry data, 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:
BS - Robert L. Brown and Stephen E. Stein
TRC - Thermodynamics Research Center, NIST Boulder Laboratories, Chris Muzny director
AC - William E. Acree, Jr., James S. Chickos
DH - Eugene S. Domalski and Elizabeth D. Hearing
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
Tboil | 299.7 | K | N/A | PCR Inc., 1990 | BS |
Tboil | 299. | K | N/A | Sommer, Goldberg, et al., 1946 | Uncertainty assigned by TRC = 3. K; ~; TRC |
Quantity | Value | Units | Method | Reference | Comment |
Ttriple | 172. ± 5. | K | AVG | N/A | Average of 7 values; Individual data points |
Quantity | Value | Units | Method | Reference | Comment |
Tc | 448.640 | K | N/A | McGlashan and McKinnon, 1977 | Uncertainty assigned by TRC = 0.03 K; TRC |
Quantity | Value | Units | Method | Reference | Comment |
Pc | 28.21 | bar | N/A | McGlashan and McKinnon, 1977 | Uncertainty assigned by TRC = 0.01 bar; TRC |
Quantity | Value | Units | Method | Reference | Comment |
Vc | 0.362 | l/mol | N/A | McGlashan and McKinnon, 1977 | Uncertainty assigned by TRC = 0.008 l/mol; TRC |
Quantity | Value | Units | Method | Reference | Comment |
ΔvapH° | 26.0 ± 0.6 | kJ/mol | C | Voronkov, Baryshok, et al., 1988 | AC |
Enthalpy of vaporization
ΔvapH (kJ/mol) | Temperature (K) | Method | Reference | Comment |
---|---|---|---|---|
24.204 | 299.80 | N/A | Aston, Kennedy, et al., 1941 | P = 101.325 kPa; DH |
24.2 ± 0.1 | 299. | C | Bergmann and Haskelberg, 1941 | AC |
Entropy of vaporization
ΔvapS (J/mol*K) | Temperature (K) | Reference | Comment |
---|---|---|---|
80.73 | 299.80 | Aston, Kennedy, et al., 1941 | P; 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 to 293.64 | 3.97703 | 1047.272 | -36.057 | Aston, Kennedy, et al., 1941 | Coefficents calculated by NIST from author's data. |
Enthalpy of fusion
ΔfusH (kJ/mol) | Temperature (K) | Reference | Comment |
---|---|---|---|
6.74 | 174. | Domalski and Hearing, 1996 | AC |
Enthalpy of phase transition
ΔHtrs (kJ/mol) | Temperature (K) | Initial Phase | Final Phase | Reference | Comment |
---|---|---|---|---|---|
0.703 | 165.920 | crystaline, α | liquid | Harada, Atake, et al., 1977 | DH |
5.878 | 171.016 | crystaline, β | liquid | Harada, Atake, et al., 1977 | DH |
5.8409 | 70.983 | crystaline, II | liquid | Shinoda, Enokida, et al., 1973 | Metastable form.; DH |
6.7413 | 174.049 | crystaline, I | liquid | Shinoda, Enokida, et al., 1973 | Stable form.; DH |
5.9697 | 171.04 | crystaline, I | liquid | Aston, Kennedy, et al., 1941 | DH |
6.895 | 174.12 | crystaline, II | liquid | Aston, Kennedy, et al., 1941 | DH |
Entropy of phase transition
ΔStrs (J/mol*K) | Temperature (K) | Initial Phase | Final Phase | Reference | Comment |
---|---|---|---|---|---|
4.24 | 165.920 | crystaline, α | liquid | Harada, Atake, et al., 1977 | DH |
34.37 | 171.016 | crystaline, β | liquid | Harada, Atake, et al., 1977 | DH |
34.16 | 70.983 | crystaline, II | liquid | Shinoda, Enokida, et al., 1973 | Metastable; DH |
38.73 | 174.049 | crystaline, I | liquid | Shinoda, Enokida, et al., 1973 | Stable; DH |
34.90 | 171.04 | crystaline, I | liquid | Aston, Kennedy, et al., 1941 | DH |
39.60 | 174.12 | crystaline, II | liquid | Aston, Kennedy, et al., 1941 | DH |
References
Go To: Top, Condensed phase thermochemistry data, Phase change data, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
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. β-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]
Notes
Go To: Top, Condensed phase thermochemistry data, Phase change data, References
- Symbols used in this document:
Cp,liquid Constant pressure heat capacity of liquid Pc Critical pressure S°liquid Entropy of liquid at standard conditions Tboil Boiling point Tc Critical temperature Ttriple Triple point temperature Vc Critical volume ΔHtrs Enthalpy of phase transition ΔStrs Entropy of phase transition ΔfusH Enthalpy of fusion ΔvapH Enthalpy of vaporization ΔvapH° Enthalpy of vaporization at standard conditions ΔvapS Entropy of vaporization - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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