期刊
LIQUID CRYSTALS
卷 36, 期 8, 页码 839-845出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/02678290903072035
关键词
isoxazole; X-ray diffraction; liquid crystals; luminescent materials
The thermal and optical properties of two series of unsymmetrical liquid crystalline compounds based on an isoxazole ring are described. Of these materials, 3-7 and 8-12 displayed strong absorption at 285 nm and a weak blue fluorescence in solution at around 377 nm, even with the presence of a high conjugated core. The fluorescence quantum yields observed varied from low to moderate (phi F = 1-62%), with large Stokes shifts (60-178 nm). All compounds exhibited liquid crystalline behaviour with a wide mesomorphism temperature range and characteristic phases of calamitic compounds, among them smectic A (SmA), smectic C (SmC) and nematic (N) phases. Their phases were characterised using polarising optical microscopy and differential scanning calorimetry. In addition, with X-ray diffraction experiments, layer spacing of 33.3-40.0 angstrom were observed for the smectic phases.
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