Add time:07/22/2019         Source:sciencedirect.com

The synthesis and characterization of new liquid crystal (LC) compounds based on 4-[(4-butyl-2,6-difluorophenyl)ethynyl]biphenyl core are described. New family of dielectrically positive compounds presents alternative molecular approach to the conventional LC design. Correlations between molecular structure and mesomorphic properties for compounds being isothiocyanato, cyano, trifluoromethoxy, chloro and fluoro terminated analogues as well as other known from the literature have been drawn. Additionally, the experimentally determined physical properties (birefringence, dielectric anisotropy) for presented derivatives of phenyl tolane are compared with DFT calculation's results. Compounds are characterised by 1H NMR spectroscopy and mass spectrometry (electron ionization) analysis. They show an enantiotropic nematic behavior in broad temperature range, confirmed by a polarizing thermomicroscopy, differential scanning calorimetry and dielectric spectroscopy. Detailed synthetic procedures are attached. Synthesized compounds stand as promising components of medium to highly birefringent liquid crystalline mixtures.

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