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Liquid Crystals with Large Negative Dielectric Anisotropy. Part V

✍ Scribed by Maged A. Osman

Publisher
John Wiley and Sons
Year
1985
Tongue
German
Weight
203 KB
Volume
68
Category
Article
ISSN
0018-019X

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✦ Synopsis

Abstract

Liquid crystals with negative Δϡ can be obtained by incorporating a cyano group in the terminal alkyl substituent or in an ethylene bridge between the cyclic units of the rigid core. The clearing points of such compounds are higher than those of the corresponding derivatives where the cyano group is laterally attached to a phenyl moiety. In compounds where both cyclic units of the rigid core are cyclohexyl, this type of substitution leads to an optimal contribution to Ο΅βŸ‚ in contrast to the cyanophenyl derivatives.

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## Abstract Stable liquid crystals with negative dielectric anisotropy containing the bicyclo [2.2.2]octyl group were synthesized. The incorporation of this moiety in the molecules increased the thermodynamic stability of the mesophase and lowered the smectic tendency. These new compounds can be us

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We report here uniform and defect-free homeotropic alignment of nematic liquid crystal having negative dielectric anisotropy (ΔΡ<0) on cleaned substrates, which can be changed to bright state (homogeneous alignment) by applying an electric field. However, non-uniformity in the bright state would not

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## Abstract Cyanothyl‐subsituted cylohexyl cyclohexanoates, bi(cyclohexanes) and phenyl cyclohexanes were synthisized. Their mesmorphic behaviour is compared to that of the corresponding cyano derivatives. (Cyanoethyl)cyclohexyl cyclohenxanoates show mesmorphic properties in contrast to the corresp