Add time:08/09/2019         Source:sciencedirect.com

The 4,4′-din-alkoxyazoxybenzene (I) homologs in which the alkyl group is methyl, ethyl, n-butyl and n-hexyl and mixtures of these compounds have been studied as stationary phases in gas—liquid chromatography. The nematic mesophases of the materials are selective toward solutes on the basis of molecular shape. Specifically, they effect good separations of close-boiling meta- and para-disubstituted benzene isomers, the more linear para isomer being eluted last. The results support earlier evidence that the use of nematic mixtures is a promising approach to maximum selectivity of this type because it makes lower operating temperatures possible. Previously unreported phase diagrams of four binary systems of homologs of I and criteria for choosing components of highly selective nematic mixtures are presented.

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