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Sorption and selective chromatographic properties of isomer-selective composite sorbent based on a eutectic mixture of nematic liquid crystals and perbenzoylated β-cyclodextrin

  • Physical Chemistry of Separation Processes: Chromatography
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Abstract

Mesomorphic, sorption, and selective properties of a three-component sorbent based on a mixture of nematic (N) liquid crystals of 4-methoxy-4′-ethoxyazoxybenzene (MEAB) and 4,4′-diethoxyazoxybenzene (azoxyphenetol, AOP) of an eutectic composition and heptakis-(2,3,6-tri-O-benzoyl)-β-cyclodextrin (Bz-β-CD) are studied. For 30 organic compounds of different classes with linear and cyclic molecular structures, including optical isomers of limonene, pinene, camphene, and butanediol-2,3, thermodynamic functions are determined for their gas-phase sorption using a three-component MEAB-AOP-Bz-β- CD sorbent (62: 28: 10 wt %). It is found that the investigated sorbent possesses high structural selectivity (αp/m = 1.128–1.059, 100–130°C, N) and moderate enantioselectivity (1.07–1.02) within a broad temperature range (95–170°C) including both mesomorphic and isotropic phases of the sorbent. It is shown that the enantioselectivity of the sorbent is apparent under conditions of both increasing retention when a chiral Bz-β-CD additive is introduced into the MEAB–AOP system (limonenes, pinenes, camphenes) and decreasing retention (butanediols-2,3).

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Authors and Affiliations

  1. Samara State University, Samara, 443011, Russia

    L. A. Onuchak, T. S. Kapralova, Yu. G. Kuraeva, Z. P. Belousova & R. F. Stepanova

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  1. L. A. Onuchak
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  2. T. S. Kapralova
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  3. Yu. G. Kuraeva
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  4. Z. P. Belousova
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  5. R. F. Stepanova
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Correspondence to L. A. Onuchak.

Additional information

Original Russian Text © L.A. Onuchak, T.S. Kapralova, Yu.G. Kuraeva, Z.P. Belousova, R.F. Stepanova, 2015, published in Zhurnal Fizicheskoi Khimii, 2015, Vol. 89, No. 12, pp. 1931–1939.

In memory of prof. M.S. Vigdergauz

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Onuchak, L.A., Kapralova, T.S., Kuraeva, Y.G. et al. Sorption and selective chromatographic properties of isomer-selective composite sorbent based on a eutectic mixture of nematic liquid crystals and perbenzoylated β-cyclodextrin. Russ. J. Phys. Chem. 89, 2304–2312 (2015). https://doi.org/10.1134/S0036024415120225

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  • DOI: https://doi.org/10.1134/S0036024415120225

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