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Issue 43, 2015
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o-Carborane derivatives for probing molecular polarity effects on liquid crystal phase stability and dielectric behavior

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Abstract

A series of mesogenic derivatives of o-carborane was synthesized, their properties were analyzed by thermal, optical and XRD methods, and results were compared with those of isostructural p-carborane and benzene analogues. Comparative analysis revealed lower nematic phase stability and enhanced smectic behavior, including SmC, in the o-carborane derivatives relative to the isosteric p-carborane analogues. The effect of o-carborane on the electrooptical properties was assessed for biphenyl derivative 1[B]a in the 6CHBT nematic host giving the extrapolated Δε = 11.0, and a moderate increase of the elastic constants Kii. Complete analysis of the dielectric results for o-carborane and p-carborane analogues 1[B]a and 1[A]a was performed using the Maier–Meier formalism augmented by DFT computational methods.

Graphical abstract: o-Carborane derivatives for probing molecular polarity effects on liquid crystal phase stability and dielectric behavior

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The article was received on 07 Jul 2015, accepted on 28 Sep 2015 and first published on 29 Sep 2015


Article type: Paper
DOI: 10.1039/C5TC02046H
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J. Mater. Chem. C, 2015,3, 11412-11422

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    o-Carborane derivatives for probing molecular polarity effects on liquid crystal phase stability and dielectric behavior

    J. Pecyna, A. Jankowiak, D. Pociecha and P. Kaszyński, J. Mater. Chem. C, 2015, 3, 11412
    DOI: 10.1039/C5TC02046H

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