Diphenyl sulfide and 2-aminophenyl phenyl sulfide: An experimental thermochemical study

Abstract

In the present work, an experimental thermochemical study of diphenyl sulfide and 2-aminophenyl phenyl sulfide was carried out. The thermal behavior of these compounds was studied by differential scanning calorimetry, obtaining the enthalpy and melting temperature and the heat capacity of the liquid and solid phases of the compounds under study. By rotating bomb combustion calorimetry, the specific combustion energy was determined, from which the molar standard enthalpy of formation was calculated in the liquid phase for diphenyl sulfide and in the solid phase for 2-aminophenyl phenyl sulfide. Using thermogravimetry, the mass loss rate was evaluated, from which the enthalpy of vaporization was obtained by means of the Langmuir and Clausius-Clapeyron equations. From the enthalpy of formation in condensed phase and the phase change enthalpy, the molar standard enthalpy of formation of the compounds in the gas phase was calculated at T = 298.15 K. Finally, with these data, the energy contribution of the amino group to the formation enthalpy of diphenyl sulfide in the gas phase is discussed.