Energetic effect of the –OH and –SH groups in diphenyl sulfide: an experimental thermochemical study
摘要
The thermochemical properties of 4,4′-dihydroxydiphenyl sulfide and 4,4′-dithioldiphenyl sulfide, are reported in this work determined through experimental techniques. The enthalpy of fusion at the fusion temperature and the heat capacity of the crystalline and liquid phases were determined by differential scanning calorimetry. The standard molar enthalpy of formation (p° = 0.1 MPa) of the crystal phase at 298.15 K was determined from the specific combustion energy, which was obtained via rotating-bomb combustion calorimetry. The mass loss rate was measured by thermogravimetric analysis, which enabled the estimation of the crystal-phase vapor pressure. From these data, the enthalpy, entropy, and Gibbs sublimation energy were determined at 298.15 K. The gas-phase standard molar enthalpy of formation was derived using a thermochemical cycle that relates the crystalline-phase enthalpy of formation and the enthalpy of sublimation both at 298.15 K. The present study analyses and discusses the energetic effects of hydroxy and thiol groups on diphenyl sulfide.
Graphical abstract