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Keywords: Energy of combustion. Enthalpy of formation. Rotating-bomb calorimeter. Static-bomb calorimeter. 2-methylbenzothiazole. 2-methylbenzoxazole. 2-methyl-2-thiazoline.
This paper is a contribution to the special collection of articles dedicated to Professor María Victoria Roux of CSIC-IQFR, on occasion of her retirement.
A static-bomb combustion calorimeter and a rotating-bomb combustion calorimeter were used to determine the energies of combustion of 2-methylbenzothiazole, 2-methylbenzoxazole, and 2-methyl-2-thiazoline. The static and rotating-bomb calorimeters were recently calibrated by the standard benzoic acid combustion runs and they were tested with adequate secondary combustion standards. The rotating-bomb calorimeter was tested using thianthrene and, in the present work, 1,2,4-triazole was used to test the staticbomb calorimeter. From the energies of combustion of the compounds under study, the liquid-phase standard molar enthalpies of formation were derived, at T = 298.15 K, as: (72.5 ± 1.5), (-50.7 ± 2.1), and (-88.5 ± 2.8) kJ mol-1, respectively.
Address (URL): http://link.springer.com/article/10.1007/s11224-013-0340-z