The enthalpies of dissociation of the N-O bonds in two quinoxaline derivatives

• Tipo: Artigo em Revista Científica Internacional
• Data: 2009

Autores

Jose R B Gomes (Autor) Outra; Andre R Monteiro (Autor) Outra; Bruno B Campos (Autor) Outra; Paula Gomes (Autor) FCUP; Maria D M C R Ribeiro da Silva (Autor) FCUP

Revista

Título: Journal of Physical Organic Chemistry

Vol. 22

Páginas: 17-23

ISSN: 0894-3230

Editora: Wiley-Blackwell

Indexação

ISI Web of Knowledge - 8 Citações

Scopus - 8 Citações

Classificação Científica

FOS: Ciências exactas e naturais > Química

Outras Informações

ID Authenticus: P-003-R2H

DOI: 10.1002/poc.1419

Abstract (EN): The present work reports the first experimental thermochemical study of mono-N-oxides derived from quinoxaline, namely, 3-methoxycarbonyl-2-methyl-quinoxaline N-oxide and 3-ethoxycarbonyl-2-methyl-quinoxaline N-oxide. The values of the enthalpies of formation, in the condensed state, and of the enthalpies of sublimation, derived from static bomb calorimetry and Calvet microcalorimetry measurements, respectively, are combined to derive the standard molar enthalpies of formation in the gaseous phase for these two compounds. From the latter values, the first and second N-O bond dissociation enthalpies for the corresponding di-N-oxides have been obtained. The gas-phase experimental results are also compared with calculated data obtained with a density functional theory approach. Copyright (c) 2008 John Wiley & Sons, Ltd.

Idioma: Inglês

Tipo (Avaliação Docente): Científica