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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., 2016, 16 (2), 52—61.
DOI: 10.18083/LCAppl.2016.2.52





Sorption Thermodynamics of Nonmesogens in the "Supramolecular Liquid Crystal – β-Cyclodextrin" System and its Selectivity under Gas Chromatography Conditions



D. A. Tugareva1, Yu. G. Kuraeva1, L. A. Onuchak1, T. S. Kapralova1, S. A. Kuvshinova2, V. A. Burmistrov2

Author affiliations
1Samara State University,
1 ak. Pavlov St., Samara, 443011, Russia
E-mail: onuchak@samsu.ru
2Ivanovo State University of Chemistry and Technology,
7 Sheremetevsky Ave., Ivanovo, 153000, Russia

Abstract
The regularities of sorption from the gaseous phase of 26 organic compounds of different classes by the binary system that contains 90 wt. % of the supramolecular nematic liquid crystal 4-(2-hydroxyethoxy)-4-cyanoazoxybenzene (HEOCAB) and 10 wt. % of β-cyclodextrin (β-CD) has been studied by gas chromatography. It was found that the introduction of the chiral macrocyclic additive into HEOCAB does not alter type of mesophase, but causes a severe distortion of nematic structure. The stationary phase "HEOCAB – β-CD" has a moderate structural selectivity and enantioselectivity with respect to the low-polar optical isomers. Strong solvation between the liquid crystal and unsubstituted β-cyclodextrin screens a cavity of the macrocycle, so that the "guest-host" complexation is possible only for molecules of small volume.

Keywords: supramolecular liquid crystal, chiral macrocycles, nonmesogens, sorption thermodynamics, gas-liquid chromatography, selectivity





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