Abstract
Two kinds of fluorinated negative liquid crystal compounds were synthesized.Two series of nematic liquid crystals were measured by polarised optical microscopy with a heating stage and differential scanning calorimetry and their good mesomorphic properties were observed.For example,the negative liquid crystals introducing 1,4-perfluorophenylene to molecular structure of diphenyl acetylene have high birfringence and low rotational viscosity.The result shows that the liquid crystal compounds with ethylidene bridge could have low birfringence and low viscosity.The first type of compounds could be used in adaptive system like as application in construction of spatial light modulator;the second type of compounds could satisfy the requirements of a low viscosity component in TFT-LCD.Two target compounds were synthesized by sonogashira coupling reaction and then Pd/C catalytic hydrogenation.
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