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1 January 1998 Series of LC compound containing polar conjugated terminal groups
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A homologous series of various compounds with polar terminal groups conjugated with carbon-carbon double bonds: the cyanoethylene, cyanobutadiene, and fluorocyanoethylene groups were prepared. These derivatives have very wide mesomorphic temperature ranges. Moreover, by measuring physical properties, the mixtures containing this series were found to have large dielectric anisotropies and appropriate birefringence values. The x-ray diffraction measurement of the cyanoethylene derivatives supports an anti parallel dimer conformation in their smectic phases. A fluorine atom at the (alpha) position of the cyano group prevents the formation of such electrostatic dimers. It is concluded that the wide mesomorphic temperature range of these derivatives was caused by the stronger molecular interaction. Moreover, the derivatives which can form dimer structures showed the wider mesomorphic temperature ranges.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
A. Fujita, Kazutoshi Miyazawa, S. Matsui, Yasuyuki Gotoh, H. Takeuchi, and E. Nakagawa "Series of LC compound containing polar conjugated terminal groups", Proc. SPIE 3319, Liquid Crystals: Chemistry and Structure, (1 January 1998);

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