Binary systems of 1,1,2,2-tetrachloroethane with benzene, toluene, p-xylene, acetone and cyclohexane. Part 2.—Dielectric properties at 308.15 K

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Abstract
Measurements of dielectric constants, ε, have been made for binary liquid mixtures of 1,1,2,2-tetrachloroethane (TCE) with benzene, toluene, p-xylene, cyclohexane and acetone at 308.15 K. Measurements of refractive indices, n, have also been made for binary liquid mixtures of CHCl2CHCl2 with acetone at 308.15 K. The values of the quantity Δε, which refers to the deviations of the dielectric constants of these mixtures from values for the ideal case, have been calculated. The positive values of Δε obtained for TCE + acetone mixtures are attributed to the formation of a molecular complex between acetone and CHCl2CHCl2, whereas the negative values of Δε for the other systems may be explained as being due to a decrease in the degree of alignment of the molecular dipoles with changing composition of the mixture. The values of the equilibrium constant, Kf, for the formation of a 1 : 1 intermolecular complex between acetone and TCE have been calculated, using the dielectric-constant data. In addition, values of the apparent dipole moments, µapp, of TCE at various mole fractions in the solvents cyclohexane, benzene and p-xylene have also been calculated. The values of µ2 app show that the molecules of TCE are self-associated, and this self-association is more favoured in cyclohexane solution of than in solutions of benzene and p-xylene; this is attributed to the existence of specific interactions between TCE and the aromatic hydrocarbons. The values of µ2 app also show that the strength of specific interactions of TCE with p-xylene is greater than in the case of benzene.

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