R. Sabbah, L. Gomez
Jan 16, 1982
Citations
0
Influential Citations
11
Citations
Journal
Thermochimica Acta
Abstract
Abstract The thermochemistry of thioacetamide and thiobenzamide has been studied by combustion and sublimination calorimetry, using a rotative bomb isoperibol calorimeter in the first case, and a Tian—Calvet calorimeter equipped with a Knudsen effusion cell in the second. These investigations enabled us to determine the corresponding enthalpies. The planar molecule of thioacetamide is conjugated. From its theoretical energy of conjugation, we could propose a value for the contribution of the CS bond (598.8 kJ mole −1 ) in Klages' scheme. The use of this value in the case of thiobenzamide gave E conj.exp (298.15 K)= E conj.theor (298.15 K), so one might assume that this molecule is planar. The enthalpy of formation of thioacetamide in the gaseous state enabled us to determine its experimental enthalpy of atomization and a value of E (CS)=537.9 kJ mole −1 . The use of this value in the case of thiobenzamide resulted in an excellent agreement between the calculated and experimental enthalpies of atomization.