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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

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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