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New Heterocyclic Liquid Crystals with Benzothiazole Core
1 , 2 , 2, 3 , * 2
1  School of Chemical Sciences, Universiti Sains Malaysia, Malaysia
2  Faculty of Science, Universiti Tunku Abdul Rahman, Malaysia
3  Department of Chemistry, National University of Singapore, Singapore

Abstract: The design and synthesis of new calamitic benzothiazole-based liquid crystals, 2-[4-(4-alkyloxybenzoyloxy)phenyl]benzothiazoles, are presented. The target compound was characterized using spectroscopic techniques, such as FT-IR, NMR (1H & 13C), 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. Smectic A phase starts to emerge as monotropic phase from C10 member and changes into enantiotropic phase from C12 and persists up to C16 members.
Keywords: benzothiazole, liquid crystals, nematic, smectic A