Disiloxane, hexamethyl-
- Formula: C6H18OSi2
- Molecular weight: 162.3775
- IUPAC Standard InChIKey: UQEAIHBTYFGYIE-UHFFFAOYSA-N
- CAS Registry Number: 107-46-0
- 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: Bis(trimethylsilyl) ether; Bis(trimethylsilyl) oxide; Fluka AG; Hexamethyldisiloxane; ((CH3)3Si)2O; Oxybis(trimethylsilane); Silane, oxybis(trimethyl)-; Dow corning 200/0.65; H7310; HMDSO; Belsil DM 0.65; Disiloxane, 1,1,1,3,3,3-hexamethyl-; KF 96L; NSC 43346; OS 10; SWS-F 221; DC 200 FLUID (Salt/Mix)
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Condensed phase thermochemistry data
Go To: Top, Phase change 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: Eugene S. Domalski and Elizabeth D. Hearing
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
S°liquid | 103.7 | cal/mol*K | N/A | Dzhafarov and Kuliev, 1986 | |
S°liquid | 103.69 | cal/mol*K | N/A | Scott, Messerly, et al., 1961 |
Constant pressure heat capacity of liquid
Cp,liquid (cal/mol*K) | Temperature (K) | Reference | Comment |
---|---|---|---|
74.43 | 298.15 | Dzhafarov and Kuliev, 1986 | T = 4 to 300 K. Cp(liq) = 275.5 - 34.48x10-2T + 21.7x10-1T2 (204 to 375 K). |
74.419 | 298.15 | Scott, Messerly, et al., 1961 | T = 12 to 371 K. |
Phase change data
Go To: Top, Condensed phase 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 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 | 373. ± 2. | K | AVG | N/A | Average of 7 values; Individual data points |
Quantity | Value | Units | Method | Reference | Comment |
Ttriple | 204.93 | K | N/A | Scott, Messerly, et al., 1961, 2 | Uncertainty assigned by TRC = 0.02 K; TRC |
Quantity | Value | Units | Method | Reference | Comment |
Tc | 518.7 | K | N/A | McLure and Dickinson, 1976 | Uncertainty assigned by TRC = 0.51 K; TRC |
Quantity | Value | Units | Method | Reference | Comment |
Pc | 19.00 | atm | N/A | McLure and Dickinson, 1976 | Uncertainty assigned by TRC = 0.099 atm; for sample see E.Dickinson and I.A.McClure, 1974-234; TRC |
Enthalpy of vaporization
ΔvapH (kcal/mol) | Temperature (K) | Method | Reference | Comment |
---|---|---|---|---|
8.82 | 315. | EB | Flaningam, 1986 | Based on data from 300. to 383. K.; AC |
7.91 | 327. | N/A | Ditsent, Skorokhodov, et al., 1971 | Based on data from 293. to 361. K.; AC |
8.6 | 324. | EB | Scott, Messerly, et al., 1961 | Based on data from 309. to 411. K.; AC |
8.27 ± 0.02 | 332. | C | Scott, Messerly, et al., 1961 | AC |
7.91 ± 0.02 | 351. | C | Scott, Messerly, et al., 1961 | AC |
7.48 ± 0.02 | 373. | C | Scott, Messerly, et al., 1961 | AC |
Antoine Equation Parameters
log10(P) = A − (B / (T + C))
P = vapor pressure (atm)
T = temperature (K)
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Temperature (K) | A | B | C | Reference | Comment |
---|---|---|---|---|---|
309.4 to 411.56 | 3.89628 | 1203.916 | -64.673 | Scott, Messerly, et al., 1961 | Coefficents calculated by NIST from author's data. |
Enthalpy of fusion
ΔfusH (kcal/mol) | Temperature (K) | Reference | Comment |
---|---|---|---|
2.8489 | 204.93 | Dzhafarov and Kuliev, 1986 | DH |
2.84940 | 204.93 | Scott, Messerly, et al., 1961 | DH |
2.849 | 204.9 | Domalski and Hearing, 1996 | AC |
Entropy of fusion
ΔfusS (cal/mol*K) | Temperature (K) | Reference | Comment |
---|---|---|---|
13.91 | 204.93 | Scott, Messerly, et al., 1961 | DH |
IR Spectrum
Go To: Top, Condensed phase thermochemistry data, Phase change data, References, Notes
Data compiled by: Coblentz Society, Inc.
Data compiled by: NIST Mass Spectrometry Data Center, William E. Wallace, director
References
Go To: Top, Condensed phase thermochemistry data, Phase change data, IR Spectrum, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Dzhafarov and Kuliev, 1986
Dzhafarov, O.I.; Kuliev, A.M.,
Heat capacity and thermodynamic properties of disiloxanes,
Dokl. Akad. Nauk. Azerb., 1986, SSR 42, 56-59. [all data]
Scott, Messerly, et al., 1961
Scott, D.W.; Messerly, J.F.; Todd, S.S.; Guthrie, G.B.; Hossenlopp, I.A.; Moore, R.T.; Osborn, A.; Berg, W.T.; McCullough, J.P.,
Hexamethyldisiloxane: chemical thermodynamic properties and internal rotation about the siloxane linkage,
J. Phys. Chem., 1961, 65, 1320-1326. [all data]
Scott, Messerly, et al., 1961, 2
Scott, D.W.; Messerly, J.F.; Todd, S.S.; Guthrie, G.B.; Hossenlopp, I.A.; Moore, R.T.; Osborn, A.G.; Berg, W.T.; McCullough, J.P.,
Hexamethyldisiloxane: chemical thermodynamic properties and internal rotation about the siloxane linkage,
J. Phys. Chem., 1961, 65, 1320-6. [all data]
McLure and Dickinson, 1976
McLure, I.A.; Dickinson, E.,
Vapor pressure of hexamethyldisiloxane near its critical point: corresponding-states principle for dimethylsiloxanes,
J. Chem. Thermodyn., 1976, 8, 93-5. [all data]
Flaningam, 1986
Flaningam, Ora L.,
Vapor pressures of poly(dimethylsiloxane) oligomers,
J. Chem. Eng. Data, 1986, 31, 3, 266-272, https://doi.org/10.1021/je00045a002
. [all data]
Ditsent, Skorokhodov, et al., 1971
Ditsent, V.E.; Skorokhodov, I.I.; Terent'eva, N.A.; Zolotareva, M.N.,
Russ. J. Phys. Chem., 1971, 45, 6, 901. [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, IR Spectrum, 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 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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