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Citation: Teck Ming Koh, Sie Tiong Ha, Teck Leong Lee, Siew Ling Lee, Guan Yeow Yeap, Hong Cheu Lin, Ramesh T. Subramaniam. Synthesis and mesomorphic evaluation of new calamitic liquid crystals containing benzothiazole core[J]. Chinese Chemical Letters, ;2011, 22(5): 619-622. doi: 10.1016/j.cclet.2010.10.042 shu

Synthesis and mesomorphic evaluation of new calamitic liquid crystals containing benzothiazole core

a Department of Science, Faculty of Engineering & Science, Universiti Tunku Abdul Rahman, Jln Genting Klang, Setapak, 53300 Kuala Lumpur, Malaysia;
b Department of Chemistry, National University of Singapore, Singapore 117543, Singapore;
c Department of Chemical Science, Faculty of Science, Universiti Tunku Abdul Rahman, Jln Universiti, Bandar Barat, 31900 Kampar, Perak, Malaysia;
d Ibnu Sina Institute for Fundamental Science Studies, Universiti Teknologi Malaysia, 81310 UTM Skudai, Johor, Malaysia;
e Liquid Crystal Research Laboratory, School of Chemical Sciences, Universiti Sains Malaysia, 11800 Minden, Penang, Malaysia;
f Department of Materials Science & Engineering, National Chiao Tung University, Hsinchu 300, Taiwan, ROC;
g Center for Ionics University Malaya, Department of Physics, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia

Received Date: 10 September 2010

Fund Project: The author (S.T.Ha) would like to thank Universiti Tunku Abdul Rahman (UTAR) for the UTAR Research Fund (No.6200/H02) and the Malaysia Toray Science Foundation (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 design and synthesis of new calamitic benzothiazole-based liquid crystals, 2-[4-(4-alkyloxybenzoyloxy)-phenyI]ben-zothiazoles are presented.The target compound was characterized using spectroscopic techniques, such as FT-IR, NMR(¹H and 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(> 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.
- Benzothiazole,
- Alkoxy chain;Nematic,
- Smectic A,
- Liquid crystal
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