Heats of combustion and formation of 4-phenyl-1,2,3-selenadiazole and dibenzyl diselenide

Abstract

By means of a conventional adiabatic bomb calorimeter, the heats of combustion of crystalline 4-phenyl-1,2,3-selenadiazole and dibenzyl diselenide have been determined to be 1097 and 1942·7 kcal mol^–1 respectively. Also, by means of transpiration and mass spectrometric methods, the heats of sublimation were determined. The values obtained are 22·5 kcal mol^–1 for 4-phenyl-1,2,3-selenadiazole and 31·2 kcal mol^–1 for dibenzyl diselenide. From these values for dibenzyl diselenide and available thermochemical data, the carbon–selenium bond energy has been calculated to be 57 kcal mol^–1.