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Synthesis and Mesomorphic Properties of Two Series of Laterally Fluorinated Symmetric Ester Liquid Crystals

Two series of symmetric ester liquid crystals (nAFBHQ and nADFBHQ) with lateral fluorine atoms have been synthesized. Their chemical structures were measured by FTIR, 1H NMR, and elemental analysis (EA). Their mesomorphic properties were investigated by differential scanning calorimetry (DSC) and polarizing optical microscopy (POM). It was found that both series showed nematic phase only. And their melting point and clearing point decreased with the number of carbon atoms in alkoxy group. It can also be found that nAFBHQ have approximately the same temperatures of melting point but much higher temperatures of clearing point than their corresponding compound in nADFBHQ series.