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Liquid Crystals and their Application
Russian Journal

Zhidkie kristally i ikh prakticheskoe ispol'zovanie

Жидкие кристаллы и их практическое использование

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Zhidk. krist. ikh prakt. ispol'z. = Liq. Cryst. and their Appl., 2017, 17 (4), 49—59.
DOI: 10.18083/LCAppl.2017.4.49





Sorption and Selective Properties of the "Supramolecular Liquid Crystal – Acetyltosilized β-Cyclodextrin" Binary Sorbent in Gas Chromatography Conditions



D. A. Tugareva, L. A. Onuchak, Yu. G. Kuraeva, T. S. Kapralova

Author affiliations
Samara National Research University,
34 Moskovskoye shosse, Samara, 443086, Russia
E-mail: tugaryova_da@mail.ru

Abstract
The mesomorphic and sorption properties of a binary system containing a supramolecular smectic-nematic liquid crystal 4-(3-hydroxypropyloxy)-4'-formylazobenzene (HPOFAB) and 10 wt.%-additive of heptakis-(2,3-di-O-acetyl-6-O-tosyl)-β-cyclodextrin (Ac-Ts-β-CD) were investigated. It was established that the introduction of chiral macrocyclic compound Ac-Ts-β-CD does not change the type of mesophase (SA, N) in HPOFAB, but leads to distortion of the texture due to pronounced «LC – macrocycle» solvation. The thermodynamic sorption characteristics from the gas phase of 25 non-mesogenic sorbates (hydrocarbons and alcohols with acyclic and cyclic structure) were studied by reversed gas-liquid chromatography. It was established that, due to solvation, the binding of molecules of sorbates to a macrocycle is due to inclusive complexation, which is more pronounced for hydrocarbons. The binary system studied has a high selectivity to para- and meta-xylenes (αп/м = 1,18, T = 110 °С) and a moderate enantioselectivity with respect to isomers of camphene and butanediol-2,3.

Keywords: supramolecular liquid crystal, bifunctional derivative of β-cyclodextrin, binary sorbent, gas-liquid chromatography, sorption thermodynamics, structural selectivity, enantioselectivity, "host-guest" complexes





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