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Chloropentamethylbenzene

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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 bar74.446cal/mol*KN/AGyoten, Yoshimoto, et al., 1982T = 300 K, S for phases II, III, and IV.

Constant pressure heat capacity of solid

Cp,solid (cal/mol*K) Temperature (K) Reference Comment
58.461300.Gyoten, Yoshimoto, et al., 1982T = 3 to 300 K. Cp for phases II, III, and IV.

Phase change data

Go To: Top, Condensed phase thermochemistry data, UV/Visible 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:
TRC - Thermodynamics Research Center, NIST Boulder Laboratories, Kenneth Kroenlein director
DH - Eugene S. Domalski and Elizabeth D. Hearing

Quantity Value Units Method Reference Comment
Tfus427.KN/AWhite, Biggs, et al., 1940Uncertainty assigned by TRC = 2. K; TRC

Enthalpy of phase transition

DeltaHtrs (kcal/mol) Temperature (K) Initial Phase Final Phase Reference Comment
0.22284.0crystaline, IVcrystaline, IIIGyoten, Yoshimoto, et al., 1982DH
0.3179153.5crystaline, IIIcrystaline, IIGyoten, Yoshimoto, et al., 1982DH
0.3179180.4crystaline, II'crystaline, IIGyoten, Yoshimoto, et al., 1982DH
0.3585187.2crystaline, III'crystaline, IIGyoten, Yoshimoto, et al., 1982Phase changes c,II'/c,II and c,III'/c,II are monotropic transitions.; DH

Entropy of phase transition

DeltaStrs (cal/mol*K) Temperature (K) Initial Phase Final Phase Reference Comment
2.6584.0crystaline, IVcrystaline, IIIGyoten, Yoshimoto, et al., 1982DH
2.1153.5crystaline, IIIcrystaline, IIGyoten, Yoshimoto, et al., 1982DH
1.8180.4crystaline, II'crystaline, IIGyoten, Yoshimoto, et al., 1982DH
2.0187.2crystaline, III'crystaline, IIGyoten, Yoshimoto, et al., 1982Phase; DH

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:


UV/Visible spectrum

Go To: Top, Condensed phase thermochemistry data, Phase change data, 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: Victor Talrose, Alexander N. Yermakov, Alexy A. Usov, Antonina A. Goncharova, Axlexander N. Leskin, Natalia A. Messineva, Natalia V. Trusova, Margarita V. Efimkina

Spectrum

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UVVis spectrum
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Additional Data

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Source (editor), 1973
Owner INEP CP RAS, NIST OSRD
Collection (C) 2007 copyright by the U.S. Secretary of Commerce
on behalf of the United States of America. All rights reserved.
Origin INSTITUTE OF ENERGY PROBLEMS OF CHEMICAL PHYSICS, RAS
Source reference RAS UV No. 18972
Instrument SF-16
Melting point 154.0-155.5

References

Go To: Top, Condensed phase thermochemistry data, Phase change data, UV/Visible spectrum, Notes

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

Gyoten, Yoshimoto, et al., 1982
Gyoten, H.; Yoshimoto, Y.; Atake, T.; Chihara, H., Thermodynamic studies of phase transitions in chloropentamethylbenzene, J. Chem. Phys., 1982, 77, 5097-5107. [all data]

White, Biggs, et al., 1940
White, A.H.; Biggs, B.S.; Morgan, S.O., Dielectric Evidence for Molecular Rotation in the Crystals of Certain Benzene Derivatives, J. Am. Chem. Soc., 1940, 62, 16-25. [all data]

(editor), 1973
(editor), Koptyug V.A., Atlas of Spectra of Aromatic and Heterocyclic Compounds, 1973, 3, 35. [all data]


Notes

Go To: Top, Condensed phase thermochemistry data, Phase change data, UV/Visible spectrum, References