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

• Type: Article in International Scientific Journal
• Date: 2004

Authors

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

Journal

Title: Journal of Chemical Thermodynamics

Vol. 36

Pages: 533-539

ISSN: 0021-9614

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 14 Citations

Scopus - 15 Citations

Scientific classification

FOS: Engineering and technology > Mechanical engineering

Other information

Authenticus ID: 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 7