Microwave absorption and dielectric relaxation of 1,2-dihalogenoethanes in dilute solutions

Abstract

The dielectric relaxation of 1,2-dichloroethane and 1,2-dibromoethane in dilute solution in cyclohexane, carbon tetrachloride and benzene has been studied in the microwave region over a range of temperatures. The relaxation time data at different temperatures have been used to estimate the free energy, enthalpy and entropy of activation for the relaxation mechanism. Indications of a strong molecular interaction in benzene solution, consistent with Higasi's observations, were found for both 1,2-dichloroethane and 1,2-dibromoethane. These halogenoethanes show a much weaker interaction in carbon tetrachloride. The results obtained are discussed and, where possible, compared with other determinations.