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Syntheses and mesomorphic properties of laterally fluorinatedphenyl isothiocyanatotolanes and their high birefringent mixtures

Dziaduszek J., Dąbrowski R., Ziółek A., Gauza S., Wu S. T.

Opto-Electronics Review

2009

Vol. 17, No. 1

20-24

Syntheses and mesomorphic properties of di-, tri- and tetrafluorosubstituted 4'-(4-alkylphenyl)-4-isothiocyanatotolanes are described. Four fluorine substituted compounds in the position 2', 3', 3, and 5 show stronger nematic character than difluorosubstituted ones in the position 3, 5 or 2', 3'. Example of high birefringence nematic mixture and its properties are given.

Mesomorphic and dielectric properties of esters useful for formulation of nematic mixtures for dual frequency addressing system

Ziobro D., Kula P., Dziaduszek J., Filipowicz M., Dąbrowski R., Parka J., Czub J., Urban S. S., Wu S. T.

Opto-Electronics Review

2009

Vol. 17, No. 1

16-19

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 Δ ε upon frequency, at low frequencies Δ ε reaches a value ∼ 200, while at high frequencies a small negative dielectric anisotropy appears.

Low viscosity, high birefringence liquid crystalline compounds and mixtures

Dąbrowski R., Dziaduszek J., Ziółek A., Szczuciński Ł., Stolarz Z., Sasnouski G., Bezborodov V., Lapanik W., Gauza S., Wu S. T.

Opto-Electronics Review

2007

Vol. 15, No. 1

47-51

Two types of fast switching mixtures with high positive dielectric anisotropy were described. The first type, with a birefringence below 0.3, was designed for devices operating at room or lower temperatures and the second one, with a birefringence higher than 0.3 for devices operating at elevated temperatures.