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

Autor:	Manuel J.S. Monte, Carlos Sousa
Rok vydání:	2010
Předmět:	Enthalpy of sublimation Effusion Chemistry Vapor pressure Inorganic chemistry Triphenylacetic acid Sublimation (phase transition) Knudsen number Physical and Theoretical Chemistry Condensed Matter Physics
Zdroj:	Journal of Thermal Analysis and Calorimetry. 106:913-920
ISSN:	1572-8943 1388-6150
DOI:	10.1007/s10973-010-1111-3
Popis:	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 = 105 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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::9fd3b1a743d15fac99c9e5a075579761 https://doi.org/10.1007/s10973-010-1111-3 Zobrazit plný text záznamu Full text from SpringerLink