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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Phase change data
Go To: Top, Gas phase ion energetics data, IR Spectrum, Mass spectrum (electron ionization), Gas Chromatography, 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 | 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, 2 | Based on data from 309. to 411. K.; AC |
8.27 ± 0.02 | 332. | C | Scott, Messerly, et al., 1961, 2 | AC |
7.91 ± 0.02 | 351. | C | Scott, Messerly, et al., 1961, 2 | AC |
7.48 ± 0.02 | 373. | C | Scott, Messerly, et al., 1961, 2 | 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, 2 | 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, 2 | 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, 2 | DH |
Gas phase ion energetics data
Go To: Top, Phase change data, IR Spectrum, Mass spectrum (electron ionization), Gas Chromatography, References, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Data evaluated as indicated in comments:
HL - Edward P. Hunter and Sharon G. Lias
Data compiled as indicated in comments:
LBLHLM - Sharon G. Lias, John E. Bartmess, Joel F. Liebman, John L. Holmes, Rhoda D. Levin, and W. Gary Mallard
LLK - Sharon G. Lias, Rhoda D. Levin, and Sherif A. Kafafi
RDSH - Henry M. Rosenstock, Keith Draxl, Bruce W. Steiner, and John T. Herron
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
Proton affinity (review) | 202.3 | kcal/mol | N/A | Hunter and Lias, 1998 | HL |
Quantity | Value | Units | Method | Reference | Comment |
Gas basicity | 195.1 | kcal/mol | N/A | Hunter and Lias, 1998 | HL |
Ionization energy determinations
IE (eV) | Method | Reference | Comment |
---|---|---|---|
9.6 ± 1.0 | EI | Seefeldt, Moller, et al., 1985 | LBLHLM |
9.64 ± 0.01 | PI | Molder, Pikver, et al., 1983 | LBLHLM |
9.59 ± 0.04 | EI | Hess, Lampe, et al., 1965 | RDSH |
9.88 | PE | Starzewski, Dieck, et al., 1974 | Vertical value; LLK |
Appearance energy determinations
Ion | AE (eV) | Other Products | Method | Reference | Comment |
---|---|---|---|---|---|
C3H9SiO+ | 21.8 ± 0.2 | ? | EI | Borossay, Csakvari, et al., 1971 | LLK |
C3H9Si+ | 15.4 ± 0.2 | ? | EI | Borossay, Csakvari, et al., 1971 | LLK |
C3H9Si+ | 15.36 ± 0.13 | ? | EI | Hess, Lampe, et al., 1965 | RDSH |
C5H15OSi2+ | 10.4 ± 0.2 | CH3 | EI | Seefeldt, Moller, et al., 1985 | LBLHLM |
C5H15OSi2+ | 10.20 ± 0.07 | CH3 | EI | Hess, Lampe, et al., 1965 | RDSH |
IR Spectrum
Go To: Top, Phase change data, Gas phase ion energetics data, Mass spectrum (electron ionization), Gas Chromatography, 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, Phase change data, Gas phase ion energetics data, IR Spectrum, Gas Chromatography, 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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Additional Data
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Due to licensing restrictions, this spectrum cannot be downloaded.
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 | D.HENNEBERG, MAX-PLANCK INSTITUTE, MULHEIM, WEST GERMANY |
NIST MS number | 61595 |
Gas Chromatography
Go To: Top, Phase change data, Gas phase ion energetics data, IR Spectrum, Mass spectrum (electron ionization), 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
Kovats' RI, non-polar column, isothermal
Column type | Active phase | Temperature (C) | I | Reference | Comment |
---|---|---|---|---|---|
Packed | C78, Branched paraffin | 130. | 597.4 | Dallos, Sisak, et al., 2000 | He; Column length: 3.3 m |
Packed | C78, Branched paraffin | 130. | 597.4 | Reddy, Dutoit, et al., 1992 | Chromosorb G HP; Column length: 3.3 m |
Packed | Apolane | 130. | 598. | Dutoit, 1991 | Column length: 3.7 m |
Normal alkane RI, non-polar column, temperature ramp
Column type | Active phase | I | Reference | Comment |
---|---|---|---|---|
Capillary | Squalane | 645. | Szekely, Nefedov, et al., 1967 | Nitrogen, 5. K/min; Column length: 50. m; Column diameter: 0.25 mm; Tstart: 60. C; Tend: 250. C |
Normal alkane RI, non-polar column, custom temperature program
Column type | Active phase | I | Reference | Comment |
---|---|---|---|---|
Capillary | Squalane | 646. | Szekely, Nefedov, et al., 1967 | Nitrogen; Column length: 50. m; Column diameter: 0.25 mm; Program: not specified |
References
Go To: Top, Phase change data, Gas phase ion energetics data, IR Spectrum, Mass spectrum (electron ionization), Gas Chromatography, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
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.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]
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.; 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]
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]
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]
Hunter and Lias, 1998
Hunter, E.P.; Lias, S.G.,
Evaluated Gas Phase Basicities and Proton Affinities of Molecules: An Update,
J. Phys. Chem. Ref. Data, 1998, 27, 3, 413-656, https://doi.org/10.1063/1.556018
. [all data]
Seefeldt, Moller, et al., 1985
Seefeldt, R.; Moller, W.; Schmidt, M.,
Zur elektronenstossionisierung des hexamethyldisiloxans (HMDS),
Z. Phys. Chem. (Leipzig), 1985, 266, 797. [all data]
Molder, Pikver, et al., 1983
Molder, U.H.; Pikver, R.J.; Koppel, I.A.,
Photoelectron spectra of molecules. 2. Ethers,
Org. React. (N.Y. Engl. Transl.), 1983, 20, 208. [all data]
Hess, Lampe, et al., 1965
Hess, G.G.; Lampe, F.W.; Sommer, L.H.,
An electron impact study of ionization and dissociation of trimethylsilanes,
J. Am. Chem. Soc., 1965, 87, 5327. [all data]
Starzewski, Dieck, et al., 1974
Starzewski, K.A.O.; Dieck, H.T.; Bock, H.,
Photoelectron spectra molecular properties. XXIII. Photoelectron spectra of silicon-substituted ylidic systems,
J. Organomet. Chem., 1974, 65, 311. [all data]
Borossay, Csakvari, et al., 1971
Borossay, J.; Csakvari, B.; Szepes, L.,
Determination of bond energies of organic silicon compounds on the basis of appearance potentials,
Int. J. Mass Spectrom. Ion Phys., 1971, 7, 47. [all data]
Dallos, Sisak, et al., 2000
Dallos, A.; Sisak, A.; Kulcsár, Z.; Kováts, E.,
Pair-wise interactions by gas chromatography VII. Interaction free enthalpies of solutes with secondary alcohol groups,
J. Chromatogr. A, 2000, 904, 2, 211-242, https://doi.org/10.1016/S0021-9673(00)00908-0
. [all data]
Reddy, Dutoit, et al., 1992
Reddy, K.S.; Dutoit, J.-Cl.; Kovats, E. sz.,
Pair-wise interactions by gas chromatography. I. Interaction free enthalpies of solutes with non-associated primary alcohol groups,
J. Chromatogr., 1992, 609, 1-2, 229-259, https://doi.org/10.1016/0021-9673(92)80167-S
. [all data]
Dutoit, 1991
Dutoit, J.,
Gas chromatographic retention behaviour of some solutes on structurally similar polar and non-polar stationary phases,
J. Chromatogr., 1991, 555, 1-2, 191-204, https://doi.org/10.1016/S0021-9673(01)87179-X
. [all data]
Szekely, Nefedov, et al., 1967
Szekely, T.; Nefedov, O.M.; Garzo, G.; Shiryayav, V.I.; Fritz, D.,
Gas chromatographic investigation of the thermal decomposition of polydimethylsilylene,
Acta Chim. Acad. Sci. Hung., 1967, 54, 3-4, 241-254. [all data]
Notes
Go To: Top, Phase change data, Gas phase ion energetics data, IR Spectrum, Mass spectrum (electron ionization), Gas Chromatography, References
- Symbols used in this document:
AE Appearance energy Pc Critical pressure 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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