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The design and synthesis of new calamitic benzothiazole-based liquid crystals,2-[4-(4-alkyloxybenzoyloxy)-phenyl]ben-zothiazoles are presented.The target compound was characterized using spectroscopic techniques,such as FT-IR,NMR(~1H and ~(13)C),microanalysis and EI-MS.The liquid crystalline behaviours of these compounds were thoroughly examined by differential scanning calorimetry and polarizing optical microscope techniques.These materials exhibited enantiotropic nematic phase with high thermal stability(>168℃).Smectic A phase starts to emerge as monotropic(metastable) phase from C10 member and changes into enantiotropic(stable) phase from C12 and persists up to C16 members.
The design and synthesis of new calamitic benzothiazole-based liquid crystals, 2- [4- (4-alkyloxybenzoyloxy) -phenyl] ben-zothiazoles are presented. The target compound was characterized using spectroscopic techniques such as FT-IR, NMR 1H and ~ (13) C), microanalysis and EI-MS. The liquid crystalline behaviors of these compounds were thoroughly examined by differential scanning calorimetry and polarizing optical microscope techniques. The materials prepared enantiotropic nematic phase with high thermal stability (> 168 ° C) .Smectic A phase starts to emerge as monotropic (metastable) phase from C10 member and changes into enantiotropic (stable) phase from C12 and persists up to C16 members.