alexa Influence of the molecular structure of a nematic solvent on hydrogen bonding with non-mesomorphic proton donors
Chemical Engineering

Chemical Engineering

Journal of Chromatography & Separation Techniques

Author(s): V A Burmistrov, V V Alexandriysky, O I Koifman

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The concentration dependence of the orientational order parameter of acetic acid dissolved in nematic solvents has been generated by computer simulation on the basis of an equilibrium model for liquid crystalline solutions containing non-mesogenic solutes. Comparison of this predicted dependence with experiment allows the equilibrium constants, orientational correlation coefficients on non-mesogenic solutes in hydrogen bonded complex and the dimer to be calculated. Data in the structure of H-complexes involving the liquid crystal and the solute have been obtained. Regularities in the influence of H-bonds on the ability of the solute to destabilize the nematic phase. (βNI) have been established.'The strengthening of the longitudi-nal complex is shown to result in a lowering and for the transversal complex—in an enhancing of βNI. The thermodynamic characteristics of alcohols dissolved in nematic Schiff's bases and 4-n-hexyloxy-4′-cyanobiphenyl were obtained by gas-liquid chromatography. An even-odd alternation of δH 2 and δS 2 alcohol series has been found. It is shown that the direction of the alternation depends on the alignment of the molecular components in the H-complex.

This article was published in Liquid Crystals and referenced in Journal of Chromatography & Separation Techniques

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