Mesomorphic, dielectric, and optical properties of fluorosubstituted biphenyls, terphenyls, and quaterphenyls |
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Authors: | P Kula A Spadło J Dziaduszek M Filipowicz R Dąbrowski J Czub S Urban |
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Institution: | (1) Institute of Chemistry, Military University of Technology, 2 Kaliskiego Str., 00-908 Warsaw, Poland;(2) Institute of Physics, Jagiellonian University, 4 Reymonta Str., 30-059 Cracow, Poland |
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Abstract: | Compounds with moderate and large negative dielectric anisotropy (Δɛ) are very attractive liquid crystal (LC) for vertical
alignment mode (VA). Materials with such properties can be achieved by lateral substitution of a polar group into a mesogenic
molecule. We synthesized some new LC materials with a negative value of Δɛ, a moderately high birefringence (Δn), and a low
viscosity. The mesomorphic and physical behaviour of the novel biphenyls, terphenyls and quaterphenyls fluorosubstituted in
the rigid core and also with fluorinated alkyl and alkoxy chains are investigated. The prepared series of four LC compounds
are promising for new LC mixtures for various applications. Examples of nematic mixtures with Δɛ∼−3.25 will be presented. |
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Keywords: | liquid crystals negative dielectric anisotropy optical anisotropy |
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