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Cyclotrisiloxane, hexamethyl-

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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, 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
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., 1982Uncertainty assigned by TRC = 0.02 K; TRC

Enthalpy of vaporization

DeltavapH (kcal/mol) Temperature (K) Method Reference Comment
9.75357.EBFlaningam, 1986Based on data from 342. - 419. K.; AC
9.49368.N/ABragin and Karapet'yants, 1974Based on data from 353. - 403. K.; AC
9.3373.N/ADitsent, Skorokhodov, et al., 1971Based on data from 339. - 407. K.; AC
9.49365.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 (atm)
    T = temperature (K)

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Temperature (K) A B C Reference Comment
297.4 - 335.61.74912404.805-196.763Osthoff, Grubb, et al., 1953, 2Coefficents calculated by NIST from author's data.

Enthalpy of sublimation

DeltasubH (kcal/mol) Temperature (K) Reference Comment
13.2 ± 0.1316.Osthoff, Grubb, et al., 1953, 2Based on data from 297. - 335. K.; AC

Enthalpy of fusion

DeltafusH (kcal/mol) Temperature (K) Reference Comment
3.970335.2Domalski and Hearing, 1996See also Alvik, Dale, et al., 1971.; AC

Enthalpy of phase transition

DeltaHtrs (kcal/mol) Temperature (K) Initial Phase Final Phase Reference Comment
3.9701335.22crystaline, IliquidKuliev, Dzhafarov, et al., 1982, 2DH

Entropy of phase transition

DeltaStrs (cal/mol*K) Temperature (K) Initial Phase Final Phase Reference Comment
11.8335.22crystaline, IliquidKuliev, Dzhafarov, et al., 1982, 2DH

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:


References

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

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
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]

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, Zhur. Fiz. Khim., 1982, 56, 310-313. [all data]


Notes

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