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

• Type: Article in International Scientific Journal
• Date: 2016

Authors

Almeida, ARRP (Author) Other; Manuel J S Monte (Author) FCUP

Journal

Title: Journal of Chemical & Engineering Data

Vol. 61

Pages: 1012-1020

ISSN: 0021-9568

Publisher: American Chemical Society

Indexing

ISI Web of Knowledge - 14 Citations

Scopus - 14 Citations

Other information

Authenticus ID: 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 9