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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 |
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Sorption Thermodynamics of Nonmesogens in the "Supramolecular Liquid Crystal – β-Cyclodextrin" System and its Selectivity under Gas Chromatography Conditions
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D. A. Tugareva1, Yu. G. Kuraeva1, L. A. Onuchak1, T. S. Kapralova1, S. A. Kuvshinova2, V. A. Burmistrov2
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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
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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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