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Abstract
A series of new rod-shaped mesomorphic compounds, 6-ethoxy-2-(4-alkanoyloxybenzylidenamino)benzothiazoles, consisting of a 2,6-disubstituted benzothiazole core and a Schiff base central linkage, were synthesized and their structures were ascertained via elemental analysis and spectroscopic techniques. Their mesomorphic properties were studied using differential scanning calorimetry (DSC), polarized optical microscopy (POM) and X-ray diffraction (XRD) analysis. All compounds showed enantiotropic mesomorphism. Whilst the lower members of the series, hexanoyloxy and octanoyloxy derivatives exhibited nematic phase, the higher members (decanoyloxy, dodecanoyloxy, tetradecanoyloxy, hexadecanoyloxy and octadecanoyloxy derivatives) exhibited nematic and smectic C phases.
Acknowledgements
The author (S.T. Ha) would like to thank Universiti Tunku Abdul Rahman (UTAR) for the UTAR Research Fund (vote no. 6200/H02) and the Malaysia Toray Science Foundation (UTAR vote no. 4359/000) for funding this project. T.M. Koh would like to acknowledge UTAR for the award of the research and teaching assistantships. The powder XRD measurements are supported by beamline BL17A (charged by Dr Jey-Jau Lee) of the National Synchrotron Radiation Research Center, Taiwan.