Thermochemical study of the cyanophenol isomers

• Tipo: Artigo em Revista Científica Internacional
• Data: 2004

Autores

Matos, MAR (Autor) FCUP; Miranda, MS (Autor) Outra; Morais, VMF (Autor) ICBAS

Revista

Título: Structural Chemistry

Vol. 15

Páginas: 103-116

ISSN: 1040-0400

Editora: Springer Nature

Indexação

ISI Web of Knowledge - 16 Citações

Scopus - 18 Citações

Classificação Científica

FOS: Ciências exactas e naturais > Química

Outras Informações

ID Authenticus: P-000-B4D

DOI: 10.1023/b:stuc.0000011245.91971.c1

Abstract (EN): The standard (pdegrees = 0.1MPa) molar enthalpies of formation for 2-, 3- and 4-cyanophenol in the gaseous phase were derived from the standard molar enthalpies of combustion in oxygen at T D 298: 15 K, measured by static bomb combustion calorimetry, and the standard molar enthalpies of sublimation at 298.15 K, measured by Calvet microcalorimetry: 2-cyanophenol, (32.8 +/- 2.1) kJ-mol(-1); 3-cyanophenol, (37.8 +/- 2.2) kJ-mol(-1); 4-cyanophenol, (35.1 +/- 2.5)-kJ-mol(-1). Ab initio geometry optimizations of the three cyanophenols and respective phenoxyl radicals and phenoxide anions were performed using the 6-31G* basis sets. Single-point MP2 and DFT energy calculations allowed the estimation of the enthalpies of formation in the gaseous phase, the O-H bond dissociation energies, and the gas-phase acidities of the three cyanophenols. The theoretical results are generally in good agreement with the experimental findings.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 14