Abstract
But-3-enyl-based fluorinated biphenyl liquid crystals, composed of alkyl chain, trans-cyclohexane and biphenyl mesogenic core, ethylene linking group, lateral fluoro substitute, and but-3-enyl terminal group, were prepared via nine step reactions based on 4-alkylcyclohexanecarboxylic acids, and their structures were confirmed via infrared spectrometry, nuclear magnetic resonance, and mass spectrometry. The mesomorphic properties of these compounds were investigated by differential scanning calorimetry and polarising optical microscopy. The results showed that these compounds exhibited a broad nematic mesophase with low melting points and high clearing points. The effects of the but-3-enyl terminal group and the lateral fluoro substituent on the mesomorphic properties were discussed. These but-3-enyl-based biphenyl liquid crystals have potential for use in liquid crystal display mixtures.
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