Synthesis of new schiff base ester liquid crystals with a benzothiazole core |
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| Authors: | Sie-Tiong Ha Teck-Ming Koh Siew-Ling Lee Guan-Yeow Yeap Hong-Cheu Lin Siew-Teng Ong |
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| Institution: | 1. Department of Chemical Science , Universiti Tunku Abdul Rahman , 31900, Kampar, Malaysia hast@utar.edu.my hast_utar@yahoo.com;3. Department of Science , Universiti Tunku Abdul Rahman , 53300, Kuala Lumpur, Malaysia;4. Ibnu Sina Institute for Fundamental Science Studies, Universiti Teknologi Malaysia , Johor, Malaysia;5. Liquid Crystal Research Laboratory , School of Chemical Sciences, Universiti Sains Malaysia , 11800, Minden, Malaysia;6. Department of Materials Science and Engineering , National Chiao Tung University , Hsinchu, 300, Taiwan, Republic of China;7. Department of Chemical Science , Universiti Tunku Abdul Rahman , 31900, Kampar, Malaysia |
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| Abstract: | A series of new calamitic liquid crystals, 6-methoxy-2-(4-alkanoyloxybenzylidenamino)benzothiazoles, comprising a benzothiazole core, terminal methoxy group and a Schiff base linkage were synthesised and characterised. This series comprises 12 members wherein members differ by the length of the alkanoyloxy chain (C n-1H2n-1COO-, where n?=?2–8, 10, 12, 14, 16, 18). Their mesomorphic properties were studied by using differential scanning calorimetry, optical polarising microscopy and powder X-ray diffraction techniques. The short chain derivatives (n?=?2 and 3) were non-mesogenic compounds, while an enantiotropic nematic phase was present throughout the remaining members of the series. The smectic C phase emerged from the decanoyloxy derivative onwards. |
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| Keywords: | 6-methoxy-2-(4-alkanoyloxybenzylidenamino)benzothiazole Schiff bases nematic smectic C |
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