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The dimesogenic compound consisting of cholesterol and cyanobiphenyl mesogens interlinked byω-oxyalkanoyl spacer was synthesized.The mesomorphic properties were investigated by differential scanning calorimetry(DSC),polarizing optical microscopy(POM),and X-ray diffraction(XRD).The experimental results indicated that this compound exhibited mesophase over a much wider temperature range and a new mesophase blue phase(BP).Focal conic domains(FCDs) and droplets texture to the smectic A phase(SA),oily streaks typical to the chiral nematic(N~*) phase were found in the liquid crystalline state,respectively. Besides,it exhibited a smectic layer spacing about 1.0 time to the length of the molecule,which indicated a monolayer type of SA ordering.
The dimesogenic compound consisting of cholesterol and cyanobiphenyl mesogens interlinked by ω-oxyalkanoyl spacer was synthesized. Mesomorphic properties were investigated by differential scanning calorimetry (DSC), polarizing optical microscopy (POM), and X-ray diffraction (XRD) that this compound exhibits mesophase over a much wider temperature range and a new mesophase blue phase (BP) .Focal conic domains (FCDs) and droplets texture to the smectic A phase (SA), oily streaks typical to the chiral nematic ) phase were found in the liquid crystalline state, respectively. It has a smectic layer spacing of about 1.0 time to the length of the molecule, which indicates a monolayer type of SA ordering.