The Dependence of Intermolecular Interaction Parameters
in the Chlorobenzeneo-Chlorotoluene System
on the Composition of Solutions

L. V. Lanshina and A. I. Abramovich

Faculty of Chemistry, Moscow State University, Moscow, 119992 Russia

e-mail: abramovich@phys.chem.msu.ru

Received June 20, 2007

Abstract—The density, velocity of ultrasound, and the degree of depolarization and intensity of molecular light
scattering were measured for chlorobenzene–o-chlorotoluene solutions. The excess molar volume, adiabatic
compressibility, and isotropic and anisotropic molecular light scattering intensities were calculated. An analysis
of the concentration dependences of the calculated parameters showed that solutions contained homo- and het-
eromolecular agglomerates of similar sizes over the range of chlorobenzene concentrations 0.1 < x < 0.9. The
intermolecular interaction energy between like molecules was higher somewhat than that between unlike mol-
ecules. At low chlorobenzene concentrations in o-chlorotoluene (x < 0.1), the thermodynamic and molecular
light scattering parameters sharply changed, which was evidence of substantial changes in the local structure
of o-chlorotoluene caused by the addition of chlorobenzene.

DOI: 10.1134/S0036024408110113

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