Thermodynamic study on the sublimation of diphenyl and triphenyl substituted acetic and propanoic acids

• Type: Article in International Scientific Journal
• Date: 2011

Authors

Manuel J S Monte (Author) FCUP; Carlos A D Sousa (Author) Other

Journal

Title: Journal of Thermal Analysis and Calorimetry

Vol. 106

Pages: 913-920

ISSN: 1388-6150

Publisher: Springer Nature

Indexing

ISI Web of Knowledge - 2 Citations

Scopus - 2 Citations

Scientific classification

FOS: Natural sciences > Chemical sciences

Other information

Authenticus ID: P-002-J59

DOI: 10.1007/s10973-010-1111-3

Abstract (EN): Knudsen mass-loss effusion technique was used for measuring the vapor pressures at different temperatures of the following crystalline compounds: diphenylacetic acid, between 357.27 and 379.08 K; triphenylacetic acid, between 418.98 and 436.97 K; 2,2-diphenylpropanoic acid, between 366.08 and 386.00 K; 3,3-diphenylpropanoic acid, between 366.09 and 386.03 K; 3,3,3-triphenylpropanoic acid, between 402.17 and 420.10 K. From the temperature dependence of the vapor pressure of each crystalline compound, the standard (p (0) = 10(5) Pa) molar enthalpies and Gibbs energies of sublimation, at T = 298.15 K, were derived. The measured thermodynamic properties are compared with literature results for phenylacetic and phenylpropanoic acids and correlations for estimation of the vapor pressures from the enthalpy of sublimation and the temperature of fusion of these and other compounds are presented.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 8