Disilane, hexamethyl-
- Formula: C6H18Si2
- Molecular weight: 146.3781
- IUPAC Standard InChIKey: NEXSMEBSBIABKL-UHFFFAOYSA-N
- CAS Registry Number: 1450-14-2
- 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: Hexamethyldisilane; (CH3)6Si2; Permethyldisilane; CH7280
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Phase change 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:
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
CAL - James S. Chickos, William E. Acree, Jr., Joel F. Liebman, Students of Chem 202 (Introduction to the Literature of Chemistry), University of Missouri -- St. Louis
DH - Eugene S. Domalski and Elizabeth D. Hearing
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
Tboil | 386. | K | N/A | Farchan Laboratories, 1990 | BS |
Tboil | 386. | K | N/A | PCR Inc., 1990 | BS |
Quantity | Value | Units | Method | Reference | Comment |
Tfus | 287.1 | K | N/A | Takagi, Ishikawa, et al., 1986 | Uncertainty assigned by TRC = 0.1 K; TRC |
Tfus | 287.22 | K | N/A | Takagi, Ishikawa, et al., 1986 | Uncertainty assigned by TRC = 0.05 K; TRC |
Tfus | 287.7 | K | N/A | Suga and Seki, 1959 | Crystal phase 1 phase; Uncertainty assigned by TRC = 0.2 K; TRC |
Enthalpy of vaporization
ΔvapH (kJ/mol) | Temperature (K) | Method | Reference | Comment |
---|---|---|---|---|
36.3 | 320. | EB | Takagi, Ishikawa, et al., 1986, 2 | Based on data from 305. to 387. K.; AC |
37.2 | 288. to 310. | N/A | Suga and Seki, 1959, 2 | See also Takagi, Ishikawa, et al., 1986, 2.; AC |
36.8 | 294. to 334. | N/A | Brockway and Davidson, 1941 | See also Takagi, Ishikawa, et al., 1986, 2.; AC |
Enthalpy of fusion
ΔfusH (kJ/mol) | Temperature (K) | Reference | Comment |
---|---|---|---|
3.02 | 287.7 | Domalski and Hearing, 1996 | AC |
Entropy of fusion
ΔfusS (J/mol*K) | Temperature (K) | Reference | Comment |
---|---|---|---|
43.95 | 221.8 | Domalski and Hearing, 1996 | CAL |
10.49 | 287.7 |
Enthalpy of phase transition
ΔHtrs (kJ/mol) | Temperature (K) | Initial Phase | Final Phase | Reference | Comment |
---|---|---|---|---|---|
9.750 | 221.8 | crystaline, II | crystaline, I | Suga and Seki, 1959, 2 | DH |
3.017 | 287.7 | crystaline, I | liquid | Suga and Seki, 1959, 2 | DH |
Entropy of phase transition
ΔStrs (J/mol*K) | Temperature (K) | Initial Phase | Final Phase | Reference | Comment |
---|---|---|---|---|---|
43.96 | 221.8 | crystaline, II | crystaline, I | Suga and Seki, 1959, 2 | DH |
10.49 | 287.7 | crystaline, I | liquid | Suga and Seki, 1959, 2 | DH |
References
Go To: Top, Phase change data, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Farchan Laboratories, 1990
Farchan Laboratories,
Research Chemicals Catalog, Farchan Laboratories, Gainesville, FL, 1990, 91. [all data]
PCR Inc., 1990
PCR Inc.,
Research Chemicals Catalog 1990-1991, PCR Inc., Gainesville, FL, 1990, 1. [all data]
Takagi, Ishikawa, et al., 1986
Takagi, S.; Ishikawa, M.; Kumada, M.; Kimura, T.; Fujishiro, R.,
Vapor Pressure and Thermo. Prop. of Hexamethyldisilane at 305-387 K,
Thermochim. Acta, 1986, 109, 55. [all data]
Suga and Seki, 1959
Suga, H.; Seki, S.,
On the phase transition of hexamethyldisilane,
Bull. Chem. Soc. Jpn., 1959, 32, 1088. [all data]
Takagi, Ishikawa, et al., 1986, 2
Takagi, Sadao; Ishikawa, Mitsuo; Kumada, Makoto; Kimura, Takayoshi; Fujishiro, Ryoichi,
Vapour pressure and thermodynamic properties of hexamethyldisilane at 305--387 K,
Thermochimica Acta, 1986, 109, 1, 55-61, https://doi.org/10.1016/0040-6031(86)85007-9
. [all data]
Suga and Seki, 1959, 2
Suga, H.; Seki, S.,
On the phase transition of hexamethyldisilane,
Bull. Chem. Soc. Japan, 1959, 32, 1088-1093. [all data]
Brockway and Davidson, 1941
Brockway, L.O.; Davidson, N.R.,
The Molecular Structures of the Dimers of Aluminum Dimethyl Chloride, Aluminum Dimethyl Bromide, and Aluminum Trimethyl and of Hexamethyldisilane,
J. Am. Chem. Soc., 1941, 63, 12, 3287-3297, https://doi.org/10.1021/ja01857a018
. [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, Phase change data, References
- Symbols used in this document:
Tboil Boiling point Tfus Fusion (melting) point ΔHtrs Enthalpy of phase transition ΔStrs Entropy of phase transition ΔfusH Enthalpy of fusion ΔfusS Entropy of fusion ΔvapH Enthalpy of vaporization - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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