Binary systems of 1,2-dichloroethane with benzene, toluene, p-xylene, quinoline and cyclohexane. Part 3.—Dielectric properties and refractive indices at 308.15 K
- 1 January 1987
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases
- Vol. 83 (10) , 3167-3175
- https://doi.org/10.1039/f19878303167
Abstract
Measurements of dielectric constants, ε, and refractive indices, n, have been made for binary liquid mixtures of 1,2-dichloroethane (CH2ClCH2Cl) with benzene, toluene, p-xylene, quinoline and cyclohexane at 308.15 K. The values of the quantity Δε, which refers to the deviations of the dielectric constants of the mixtures from the values arising from volume fraction mixture law, have been calculated. The values of Δε have been found to be positive for CH2ClCH2Cl–quinoline, and negative for CH2ClCH2Cl–benzene, CH2ClCH2Cl–toluene, CH2ClCH2Cl–p-xylene and CH2ClCH2Cl–cyclohexane. The positive values of Δε for CH2ClCH2Cl–quinoline are attributed to the existence of a specific interaction leading to the formation of a strong complex between CH2ClCH2Cl and quinoline in the liquid state. Values of the equilibrium constant Kf for the formation of a 1 : 1 complex between CH2ClCH2Cl and quinoline have also been calculated using the dielectric constant data, and it has been found that these values of Kf are in accord with the theory of Barriol and Weisbecker, which is based upon the electrostatic interactions of the solute with the liquid. The values of the apparent dipole moments µapp of CH2ClCH2Cl at various mole fractions in the non-polar solvents benzene, p-xylene and cyclohexane have also been calculated. The values of µapp suggest that there exists a specific interaction between CH2ClCH2Cl and the aromatic hydrocarbons.Keywords
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