Mesomorphic and dielectric properties of esters useful for formulation of nematic mixtures for dual frequency addressing system |
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| Authors: | D Ziobro P Kula J Dziaduszek M Filipowicz R D?browski J Parka J Czub S Urban ST Wu |
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| Institution: | (1) Institute of Chemistry, Military University of Technology, 2 Kaliskiego Str., 00-908 Warsaw, Poland;(2) Institute of Applied Physics, Military University of Technology, 2 Kaliskiego Str., 00-908 Warsaw, Poland;(3) Institute of Physics, Jagellonian University, 4 Reymonta Str., 30-059 Cracow, Poland;(4) College of Optics CREOL, University of Florida, Orlando, FL 32816, USA |
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| Abstract: | Mesomorphic and dielectric properties of three homologous series of two and three ring fluorosubstituted esters are described.
They are 4-cyano-3-fluorophenyl 4-alkyloxy-2-fluorobenzoates, 4-cyano-3-fluorophenyl 4-(4-alkylbenzoyloxy)-2-fluorobenzoates
and 3-fluoro-4-cyanophenyl, or 3-fluoro-4-isothiocyanatophenyl or 3,4-difluorophenyl 4′-alkyl-2,3-difluoro-biphenyl-4-carboxylates.
The compounds exhibit the nematic mesophase accompanied by the smectic A or smectic C mesophase in some cases. Most of them
show strong dependence of the dielectric anisotropy Δε upon frequency, at low frequencies Δε reaches a value ∼200, while at
high frequencies a small negative dielectric anisotropy appears. |
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| Keywords: | liquid crystal dual-frequency addressing fluorosubstituted esters isothiocyanato esters |
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