Polyfluoric terphenyl liquid crystal compound and synthesis method and use thereof

Abstract

The present invention discloses a polyfluoric terphenyl liquid crystal compound. The structural formula of the compound is as follows: R1 is C1-C8 alkyl, R2 is C1-C8 alkyl, fluoro, trifluoromethyl, trifluoromethoxy; U,V, W, X, Y and Z are fluorine substituent or hydrogen, at least one thereof is fluorine substituent. The synthetic process comprises the steps of preparing an intermediate 4-alkyl iodobenzene containing fluorine, preparing an intermediate phenyloboric acid containing fluorine, preparation an intermediate 4-alkyl biphenyloboric acid containing fluorine, and synthesizing target products of the polyfluoric terphenyl liquid crystal compound. The compound has the features of great dielectric anisotropy (delta e), excellent optical, heat, electrical and chemical stability, can be used for improving properties of the liquid crystal mixture, can be widely applied in TN, HTN, STN, TFT mixed liquid crystal materials, and further can be applied in a liquid crystal display.

Description

technical field [0001] The invention belongs to the category of compounds, and specifically relates to a class of polyfluorinated terphenyl liquid crystal compounds and a synthesis method thereof, and the application in TN, HTN, STN, TFT mixed liquid crystal materials, and further applied in liquid crystal displays. Background technique [0002] Liquid crystal display products require that the liquid crystal materials used have a wide temperature range of nematic phase, low driving voltage, suitable refractive index and high dielectric anisotropy, as well as excellent chemical and optical stability, while the existing single Liquid crystal materials cannot meet the above requirements at the same time, so the usual practice is to use several liquid crystal materials with different properties to achieve the desired purpose. Biphenyl and terphenyl liquid crystals have good properties such as low melting point, low viscosity, high optical anisotropy, and high chemical stability,...

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Problems solved by technology

[0002] Liquid crystal display products require that the liquid crystal materials used have a wide temperature range of nematic phase, low driving voltage, suitable refractive index and high dielectric anisotropy, as well as excellent chemical and optical stability, while the existing single Liquid crystal materials cannot meet the above requirements at the same time, so the usual practice is to use several liquid crystal materials with different properties to achieve the desired purpose

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