Experimental thermochemical study of two 2-alkylbenzimidazole isomers (alkyl=propyl and isopropyl) |
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| Institution: | 1. Centro de Investigação em Quı́mica, Department of Chemistry, Faculty of Science, University of Porto, Rua do Campo Alegre, 687, P-4169-007 Porto, Portugal;2. Instituto de Quı́mica Fı́sica “Rocasolano”, C.S.I.C., Serrano, 119, E-28006 Madrid, Spain;3. Departamento de Quı́mica Orgánica y Biologia, Facultad de Ciencias, UNED, Senda del Rey, 9, E-28040 Madrid, Spain;4. Instituto de Quı́mica Médica, C.S.I.C., Juan de la Cierva, 3, E-28006 Madrid, Spain;5. Departamento de Quı́mica, C-9, Universidad Autónoma de Madrid, Cantoblanco, E-28049 Madrid, Spain;1. Department of Chemical Engineering and the Ilse Kats Institute for Nanoscale Science and Technology, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel;1. Department of Physics, Manonmaniam Sundaranar University, Tirunelveli 627012, Tamil Nadu, India;2. Department of Physics, Pallavan College of Engineering, Kancheepuram 631502, Tamil Nadu, India;1. Department of Chemistry, University of Jordan, Amman 11942, Jordan;2. School of Engineering and Information Technology, Murdoch University, Perth, Australia;3. Chemical Engineering Department, Al-Hussein Bin Talal University, Ma’an, Jordan;4. Chemistry Department, Memorial University, St. John''s, NL A1B 3X7, Canada;5. Chemistry Department, Al-Hussein Bin Talal University, Ma’an, Jordan;1. Sorgun Vocational School, Bozok University, 66100, Yozgat, Turkey;2. Chemistry Department, University of South Africa, Pretoria, 0003, South Africa;3. Vocational School of Health Services, Giresun University, 28200 Giresun, Turkey |
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| Abstract: | This paper reports the values of the standard (p∘=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 microcalorimetry 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. |
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