alexa Selectivity, Thermodynamic and Anisotropic Properties of Substituted Liquid-Crystal Cyanoazoxybenzenes as Stationary Phases for Gas Chromatography
ISSN: 2157-7064

Journal of Chromatography & Separation Techniques
Open Access

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Research Article

Selectivity, Thermodynamic and Anisotropic Properties of Substituted Liquid-Crystal Cyanoazoxybenzenes as Stationary Phases for Gas Chromatography

Kuvshinova SA1*, Burmistrov VA1, Novikov IV1, Alexandriysky VV1 and Koifman OI1,2

1Research Institute of Macroheterocyclic Compounds, Ivanovo State University of Chemistry and Technology, Sheremetevskii pr. 7, Ivanovo, 153000 Russia

2Institute of Solutions Chemistry, Russian Academy of Sciences, Russia

*Corresponding Author:
Sofya A Kuvshinova
Research Institute of Macroheterocyclic Compounds
Ivanovo State University of Chemistry and Technology
Sheremetevskii pr. 7, Ivanovo, 153000 Russia
Tel: +79109810792
Fax: +79109810792
E-mail: [email protected]

Received: January 24, 2016; Accepted: February 03, 2016; Published: February 10, 2016

Citation: Kuvshinova SA, Burmistrov VA, Novikov IV, Alexandriysky VV, Koifman OI (2016) Selectivity, Thermodynamic and Anisotropic Properties of Substituted Liquid-Crystal Cyanoazoxybenzenes as Stationary Phases for Gas Chromatography. J Chromatogr Sep Tech 7:314. doi:10.4172/2157-7064.1000314

Copyright: © 2016 Kuvshinova SA, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

 

Abstract

Herein we discuss physical properties of 4-(ω-hydroxyalkoxy)-4’-cyanoazoxybenzene homologs. 1D and 2D correlation NMR spectroscopy (in particular, 1Н, 15N-HMBC experiment) have allowed elucidation of structure of the prepared rod-like supramolecular cyanoazoxybenzenes. Mesomorphic properties of the compounds have been studied by means of polarization thermomicroscopy and differential scanning calorimetry. All the studied cyanoazoxybenzenes have revealed enantiotropic nematic mesomorphism over wide temperature range. Nematic mesophase of the eighth homolog has possessed large positive dielectric anisotropy. Introduction of small amounts of the prepared cyanoazoxybenzenes as additive has stabilized the mesophase and has increased the dielectric anisotropy of 4-pentyloxy-4’-cyanobiphenyl. Gas-liquid chromatography studies have shown that sorbents based on 4-(2-hydroxyethyloxy)-4’-cyanoazoxybenzene are highly selective towards various structural isomers; that cannot be achieved using conventional nematic liquid crystals. Thermodynamic evidence of specific interactions between the mesogen and the non-mesomorphic sorbate has been discovered.

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