Abstract
The orientational order parameters of monochlorobenzene have been determined, as functions of temperature and concentration, in two nematic solvents, EBBA and ZLI-1132. There are significant differences in the orientation of the solute molecule in the two solvents as reflected in the values of corresponding potential energy parameters as well as in the concentration dependence of the order parameters. These differences are caused mainly by a stronger interaction between the aromatic ring and the solvent ZLI-1132, since the change in the potential function terms for chlorobenzene parallel those for unsubstituted benzene. Attempts to correlate the orientation potential with molecular polarizability and molecular shape lead to the conclusion that neither of these properties plays a dominant role in determining the potential.
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