Thermodynamic study of phase transitions of imidazoles and 1-methylimidazoles

• Tipo: Artigo em Revista Científica Internacional
• Data: 2012

Autores

Ana R R P Almeida (Autor) Outra; Manuel J S Monte (Autor) FCUP

Revista

Título: Journal of Chemical Thermodynamics

Vol. 44

Páginas: 163-168

ISSN: 0021-9614

Editora: Elsevier

Indexação

ISI Web of Knowledge - 20 Citações

Scopus - 20 Citações

Classificação Científica

FOS: Ciências da engenharia e tecnologias > Engenharia mecânica

Outras Informações

ID Authenticus: 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.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 6