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Cyclotrisiloxane, hexamethyl-

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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
solid,1 bar412.1J/mol*KN/AKuliev, Dzhafarov, et al., 1982 

Constant pressure heat capacity of solid

Cp,solid (J/mol*K) Temperature (K) Reference Comment
360.0298.15Kuliev, Dzhafarov, et al., 1982T = 4.2 to 370 K. Data given graphically except for data at 298.15 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
Tboil407.KN/APCR Inc., 1990BS
Quantity Value Units Method Reference Comment
Tfus337.KN/AAlvik and Dale, 1971Uncertainty assigned by TRC = 0.1 K; TRC
Tfus339.5KN/AOsthoff, Grubb, et al., 1953Uncertainty assigned by TRC = 0.1 K; TRC
Quantity Value Units Method Reference Comment
Ttriple335.22KN/AKuliev, Dzhafarov, et al., 1982, 2Uncertainty assigned by TRC = 0.02 K; TRC

Enthalpy of vaporization

DeltavapH (kJ/mol) Temperature (K) Method Reference Comment
40.8357.EBFlaningam, 1986Based on data from 342. - 419. K.; AC
39.7368.N/ABragin and Karapet'yants, 1974Based on data from 353. - 403. K.; AC
39.373.N/ADitsent, Skorokhodov, et al., 1971Based on data from 339. - 407. K.; AC
39.7365.N/AOsthoff, Grubb, et al., 1953, 2Based on data from 343. - 388. K.; AC

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
297.4 - 335.61.75483404.805-196.763Osthoff, Grubb, et al., 1953, 2Coefficents calculated by NIST from author's data.

Enthalpy of sublimation

DeltasubH (kJ/mol) Temperature (K) Reference Comment
55.2 ± 0.4316.Osthoff, Grubb, et al., 1953, 2Based on data from 297. - 335. K.; AC

Enthalpy of fusion

DeltafusH (kJ/mol) Temperature (K) Reference Comment
16.61335.2Domalski and Hearing, 1996See also Alvik, Dale, et al., 1971.; AC

Enthalpy of phase transition

DeltaHtrs (kJ/mol) Temperature (K) Initial Phase Final Phase Reference Comment
16.611335.22crystaline, IliquidKuliev, Dzhafarov, et al., 1982DH

Entropy of phase transition

DeltaStrs (J/mol*K) Temperature (K) Initial Phase Final Phase Reference Comment
49.5335.22crystaline, IliquidKuliev, Dzhafarov, et al., 1982DH

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:


IR Spectrum

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Data compiled by: Coblentz Society, Inc.

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


Mass spectrum (electron ionization)

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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: 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 NIST Mass Spectrometry Data Center, 1994
NIST MS number 133472

All mass spectra in this site (plus many more) are available from the NIST/EPA/NIH Mass Spectral Library. Please see the following for information about the library and its accompanying search program.


Gas Chromatography

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

Normal alkane RI, non-polar column, temperature ramp

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Column type Active phase I Reference Comment
CapillarySP-2100827.Fischer and Kusch, 1993He, 40. C @ 3. min, 5. K/min; Column length: 30. m; Column diameter: 0.25 mm; Tend: 280. C
CapillaryMethyl Silicone833.Fujimoto, Ohtani, et al., 199025. m/0.25 mm/0.1 «mu»m, He, 5. K/min; Tstart: 40. C; Tend: 350. C

Normal alkane RI, non-polar column, custom temperature program

View large format table.

Column type Active phase I Reference Comment
CapillaryUltra-1825.Kazuyoshi, Seiichi, et al., 200030. m/0.25 mm/0.50 «mu»m; Program: 40 0C (5 min) 10 0C/min -> 200 0C 20 0C/min -> 320 0C (13 min)
CapillaryUltra-1828.Kazuyoshi, Seiichi, et al., 200030. m/0.25 mm/0.50 «mu»m; Program: 40 0C (5 min) 10 0C/min -> 200 0C 20 0C/min -> 320 0C (13 min)
CapillaryUltra-1829.Kazuyoshi, Seiichi, et al., 200030. m/0.25 mm/0.50 «mu»m; Program: 40 0C (5 min) 10 0C/min -> 200 0C 20 0C/min -> 320 0C (13 min)
CapillaryUltra-1830.Kazuyoshi, Seiichi, et al., 200030. m/0.25 mm/0.50 «mu»m; Program: 40 0C (5 min) 10 0C/min -> 200 0C 20 0C/min -> 320 0C (13 min)
CapillaryUltra-1831.Kazuyoshi, Seiichi, et al., 200030. m/0.25 mm/0.50 «mu»m; Program: 40 0C (5 min) 10 0C/min -> 200 0C 20 0C/min -> 320 0C (13 min)
CapillaryUltra-1831.Kazuyoshi, Seiichi, et al., 200030. m/0.25 mm/0.50 «mu»m; Program: 40 0C (5 min) 10 0C/min -> 200 0C 20 0C/min -> 320 0C (13 min)

References

Go To: Top, Condensed phase thermochemistry data, Phase change data, IR Spectrum, Mass spectrum (electron ionization), Gas Chromatography, NIST Free Links, Notes

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

Kuliev, Dzhafarov, et al., 1982
Kuliev, A.M.; Dzhafarov, O.I.; Karasharli, K.A.; Kostryukov, V.N., Heat capacity and thermodynamic functions of cyclic methylphenylsiloxanes, Zhur. Fiz. Khim., 1982, 56, 310-313. [all data]

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

Alvik and Dale, 1971
Alvik, T.; Dale, J., On the Lack of Conformational Preferences for Cyclic Dimethylsiloxane Oligomers., Acta Chem. Scand., 1971, 25, 2131, https://doi.org/10.3891/acta.chem.scand.25-2131 . [all data]

Osthoff, Grubb, et al., 1953
Osthoff, R.C.; Grubb, W.T.; Burkhard, C.A., Physical Properties of organosilicon compounds. I. Hexamethylcyclotrisiloxane and Octamethylcyclotetrasiloxane, J. Am. Chem. Soc., 1953, 75, 2227-9. [all data]

Kuliev, Dzhafarov, et al., 1982, 2
Kuliev, A.M.; Dzhafarov, O.I.; Karasharli, K.A.; Kostryukov, V.N., Heat capacity and thermodynamic functions of cyclic methylphenylsiloxanes, Zh. Fiz. Khim., 1982, 56, 310-13. [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]

Bragin and Karapet'yants, 1974
Bragin, G.P.; Karapet'yants, M.K., Russ. J. Phys. Chem., 1974, 48, 612. [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]

Osthoff, Grubb, et al., 1953, 2
Osthoff, Robert C.; Grubb, W.T.; Burkhard, Charles A., Physical Properties of Organosilicon Compounds. I. Hexamethylcyclotrisiloxane and Octamethylcyclotetrasiloxane, J. Am. Chem. Soc., 1953, 75, 9, 2227-2229, https://doi.org/10.1021/ja01105a060 . [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]

Alvik, Dale, et al., 1971
Alvik, Thor; Dale, Johannes; Fernholt, L.; Hedberg, Kenneth; Schaumburg, Kjeld; Ehrenberg, L., On the Lack of Conformational Preferences for Cyclic Dimethylsiloxane Oligomers., Acta Chem. Scand., 1971, 25, 2131-2141, https://doi.org/10.3891/acta.chem.scand.25-2131 . [all data]

Fischer and Kusch, 1993
Fischer, G.W.; Kusch, P., An Automated Curie-Point Pyrolysis-High Resolution Gas Chromatography System, LC-GC Int., 1993, 6, 12, 760-763. [all data]

Fujimoto, Ohtani, et al., 1990
Fujimoto, S.; Ohtani, H.; Yamagiwa, K.; Tsuge, S., Study on retention behavior of cyclic siloxanes by high resolution pyrolysis-gas chromatography with a fused silica capillary column, J. Hi. Res. Chromatogr., 1990, 13, 6, 397-404, https://doi.org/10.1002/jhrc.1240130603 . [all data]

Kazuyoshi, Seiichi, et al., 2000
Kazuyoshi, N.; Seiichi, Y.; Kazuo, K.; Katsumi, I.; Okihiko, S., Polymer analysis by improved pyrolysis gas chromatography hyphenated with four specific detectors, J. Soc. Cosmet. Chem. Jpn., 2000, 34, 2, 142-151, https://doi.org/10.5107/sccj.34.142 . [all data]


Notes

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