Thermodynamic study of phase transitions of imidazoles and 1-methylimidazoles

• Type: Article in International Scientific Journal
• Date: 2012

Authors

Ana R R P Almeida (Author) Other; Manuel J S Monte (Author) FCUP

Journal

Title: Journal of Chemical Thermodynamics

Vol. 44

Pages: 163-168

ISSN: 0021-9614

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 20 Citations

Scopus - 20 Citations

Scientific classification

FOS: Engineering and technology > Mechanical engineering

Other information

Authenticus ID: P-002-HJD

DOI: 10.1016/j.jct.2011.08.017

Abstract (EN): The vapor pressures of imidazole, N-methylimidazole and of their dichloro and dicyano substituted compounds were measured at different temperatures, in the crystalline phase for two of them, and in crystalline and liquid phases for the other four. From these measurements, enthalpies and standard entropies of sublimation and vaporization were derived. The results allowed the determination of the triple points (p, T) coordinates of the four compounds studied in both condensed phases as well as the calculation of their enthalpy of fusion. Enthalpies and temperatures of fusion were also determined using d.s.c. The experimental results enabled the estimation of the enthalpy of the intermolecular N-H center dot center dot center dot N bonds in the imidazoles studied.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 6