Experimental thermochemical study of two 2-alkylbenzimidazole isomers (alkyl = propyl and isopropyl)

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

Autores

da Silva, MAVR (Autor) FCUP; da Silva, MDMCR (Autor) FCUP; Amaral, LMPF (Autor) Outra; Jimenez, P (Autor) Outra; Roux, MV (Autor) Outra; Davalos, JZ (Autor) Outra; Temprado, M (Autor) Outra; Cabildo, P (Autor) Outra; Claramunt, RM (Autor) Outra; Elguero, J (Autor) Outra; Mo, O (Autor) Outra; Yanez, M (Autor) Outra

Revista

Título: Journal of Chemical Thermodynamics

Vol. 36

Páginas: 533-539

ISSN: 0021-9614

Editora: Elsevier

Indexação

ISI Web of Knowledge - 14 Citações

Scopus - 15 Citações

Classificação Científica

FOS: Ciências da engenharia e tecnologias > Engenharia mecânica

Outras Informações

ID Authenticus: P-000-A5B

DOI: 10.1016/j.jct.2004.03.005

Abstract (EN): This paper reports the values of the standard (p(o) = 0. 1 MPa) molar enthalpy of formation in the condensed, at T = 298.15 K, for 2-R-benzimidazoles (R = propyl, isopropyl), derived from, the respective enthalpies of combustion in oxygen, measured by static bomb combustion calorimetry and the standard molar enthalpies of sublimation, at T = 298.15 K, obtained using Calvet micro-calorimetry in the case of 2-isopropylbenzimidazole and, by the variation of vapour pressures, determined by the Knudsen effusion technique, with temperatures between (344 and 365) K for 2-propylbenzimidazole. Heat capacities, in the temperature ranges from T = 268 K to near their respective melting temperatures, T = 421 K for 2-propylbenzimidazole and T = 464 K for 2-isopropylbenzimidazole, were measured with a differential scanning calorimeter. These values were used to derive the standard molar enthalpies of formation, of the two 2-benzimidazole derivatives, in gaseous phase.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 7