Additivity of Thermodynamic Properties of Organic Compounds in the Crystalline State. 3. Heat Capacities and Related Properties of Urea Phenyl Derivatives

Heat capacities of 1,1-diphenylurea, 1,3-diphenylurea, and 1,1-dimethyl-3-phenylurea in the range (5 to 300) K were measured with an adiabatic calorimeter. Related thermodynamic functions were obtained. These functions were proved to conform to additivity principles. Taking into account the paramete...

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Bibliographic Details
Published in:Journal of chemical and engineering data 2002-03, Vol.47 (2), p.239-244
Main Authors: Diky, Vladimir V, Kozyro, Alexander A, Kabo, Gennady J
Format: Article
Language:English
Subjects:
Chemical thermodynamics
Chemistry
Exact sciences and technology
General and physical chemistry
General. Theory
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Summary:Heat capacities of 1,1-diphenylurea, 1,3-diphenylurea, and 1,1-dimethyl-3-phenylurea in the range (5 to 300) K were measured with an adiabatic calorimeter. Related thermodynamic functions were obtained. These functions were proved to conform to additivity principles. Taking into account the parameters developed earlier for alkylureas, the additive parameters of the phenyl group for calculation of the heat capacity, entropy, and thermal enthalpy of organic compounds in the crystalline state were derived.
ISSN:0021-9568
1520-5134
DOI:10.1021/je0155150