Vapor Pressures of Four Methyl Esters of Substituted Benzoic Acids. The Intermolecular Hydrogen Bond OH···O

• Tipo: Artigo em Revista Científica Internacional
• Data: 2016

Autores

Almeida, ARRP (Autor) Outra; Manuel J S Monte (Autor) FCUP

Revista

Título: Journal of Chemical & Engineering Data

Vol. 61

Páginas: 1012-1020

ISSN: 0021-9568

Editora: American Chemical Society

Indexação

ISI Web of Knowledge - 14 Citações

Scopus - 14 Citações

Outras Informações

ID Authenticus: P-00K-7VM

DOI: 10.1021/acs.jced.5b00978

Abstract (EN): This paper reports experimental vapor pressures of condensed phases of methyl p-cyano, p-formyl, p-nitro, and p-(methylamino) benzoates measured over the temperature ranges (303.9 to 393.0) K, (303.1 to 388.2) K, (319.0 to 415.8) K, and (332.9 to 392.4) K, respectively, using a static method based on capacitance diaphragm manometers. The Knudsen mass-loss effusion technique was also used to measure the vapor pressures of crystalline methyl p-(methylamino)benzoate in the temperature range (317.1 to 339.2)" K. These results enabled the calculation of the standard molar enthalpies and entropies of sublimation and of vaporization, at reference temperatures as well as the (p,T) values of the triple point of each compound. The temperatures and molar enthalpies of fusion were determined using differential scanning calorimetry and were compared with the values derived indirectly from the vapor pressure measurements. The enthalpies of the intermolecular hydrogen bonds O-H center dot center dot center dot O in the crystalline phase of the parent benzoic acids were determined.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 9