alexa Synthesis and Mesomorphic Properties of Two Series of Hydrogen-Bonded Liquid Crystals Based on Laterally Fluorinated Benzoic Acid and 4, 4′-Bipyridine With a Molar Ratio of 2:1
Chemical Engineering

Chemical Engineering

Journal of Chromatography & Separation Techniques

Author(s): Qiang Wei, Xiaonan Guo, Huai Yang

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Two series of hydrogen-bonded liquid crystal complexes have been obtained from binary mixtures of 4, 4′-bipyridine and 2-fluoro-6-X-4-alkoxybenzoic acids (where X = H or F) with a molar ratio of 2:1. The fluorinated proton donors were synthesized firstly and then their chemical structures measured by EA, FTIR, 1H NMR and 13C NMR. The existences of hydrogen bonds between the proton donors and acceptors were identified by FTIR. The liquid crystalline properties of these complexes were investigated by differential scanning calorimeter (DSC), polarizing optical microscopy (POM), and X-ray diffraction (XRD). The results indicated that these complexes with different alkoxy chains and numbers of lateral fluorine atoms exhibited different phase properties. Especially, when the alkoxy chains were short enough, the mesophase of the complexes disappeared.

This article was published in Molecular Crystals and Liquid Crystals and referenced in Journal of Chromatography & Separation Techniques

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