Enthalpies of fusion and enthalpies of solvation of aromatic hydrocarbons derivatives: Estimation of sublimation enthalpies at 298.15 K

Abstract

Enthalpy of sublimation of solid compound can be found using the values of solution enthalpy and solvation enthalpy in any solvent. In this work enthalpies of solution at infinite dilution of a number of aromatic hydrocarbons derivatives in benzene were measured at 298.15K. Comparison between experimental and literature solution enthalpies in benzene at 298.15K and fusion enthalpies at melting temperature of aromatic hydrocarbon derivatives showed, that these values are approximately equal. Thereby, fusion enthalpies at melting temperature can be used instead of their solution enthalpies in benzene at 298.15K for calculation of sublimation enthalpies at 298.15K. Solvation enthalpies in benzene at 298.15K required for this procedure were calculated using group additivity scheme. The sublimation enthalpies of 80 aromatic hydrocarbons derivatives at 298.15K were evaluated as a difference between fusion enthalpies at melting temperature and solvation enthalpies in benzene at 298.15K. Obtained in this work values of sublimation enthalpy at 298.15K for studied compounds were in a good agreement with available literature data.