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L. A. Onuchak, T. S. Burmatnova, R. Ph. Stepanova, Yu. G. Kuraeva, E. S. Tyurina

Author affiliations
Samara State University, Department of physical chemistry and chromatography
443011 Samara, Akademik Pavlov str., 1. Russian Federation

Abstract
Mesomorphic, sorption and selective properties of the three-component sorbent based on the eutectic mixture of achiral liquid crystals 4-methoxy-4'-ethoxybenzene and 4,4'-diethoxyazoxybenzene and chiral macrocyclic heptakis(2,3,6-tri-O-methyl)-β-cyclodextrin were studied. It was established that macrocyclic additive induces formation of spirally twisted chiral nematic phase. Thermodynamic functions of sorption from the gas phase for 28 organic compounds (n-alkanes, cycloalkanes, arenes, monoatomic alcohols, heterocyclic compounds, optical isomers, camphene, pinene, butanediol-2, and 3) were determined. The reasons of manifestation of isomer-selective sorbent properties with respect to structural, cis-trans- and optical isomers in gas chromatography were discussed.

Keywords: liquid crystal, chiral macrocycle, composite sorbents, gas chromatography, selectivity, enantioselectivity