Abstract
We have prepared two phenyl biphenyl carboxylate series of antiferroelectric liquid crystal compounds having the fluorine substituent in the core structure, using the optically active alcohols (R)-1,1,1-trifluoro-2-decanol and (R)-1,1,1-trifluoro-7-ethoxy-2-heptanol. The physical and electro-optical properties in a homogeneously aligned AFLC cells (1.5 w m) have been measured as functions of temperature/applied field. The magnitude of the spontaneous polarization and optical tilt angle of the 3F-substituted (outer fluoro system) compounds was found to be larger than that obtained 2F-substituted (inner fluoro system) compounds. (R)-TFMEOHPNBC exhibited V-shaped switching between SmA* and SmC A * phase. However, (R)-TFMN2FPNBC and (R)-TFM3FPNBC exhibited U-shaped switching with threshold voltage between SmA* and SmC A * phase. (R)-TFMNPNBC and (R)-TFMEOH3FPNBC having small pre-transitional effect were shown to have the uniform alignment state in the dark state.
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