EventsThe 13th International Electronic Conference on Synthetic Organic Chemistry
Event submissions
Published
with-doi10.3390/ecsoc-13-00168
This submission belongs to the session a. General Organic Synthesis of the event The 13th International Electronic Conference on Synthetic Organic Chemistry
Published date
31 Oct, 2009
Citation
Hong-Cheu Lin, Guan-Yeow Yeap, Siew-Teng Ong, Teck-Ming Koh, Sie-Tiong Ha, Synthesis and Mesogenic Properties of New Schiff Bases Comprising Benzothiazole Moiety, in Proceedings of The 13th International Electronic Conference on Synthetic Organic Chemistry, 1 November–30 November 2009, MDPI: Basel, Switzerland, doi: 10.3390/ecsoc-13-00168
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Synthesis and Mesogenic Properties of New Schiff Bases Comprising Benzothiazole Moiety

Hong-Cheu Lin 1
Guan-Yeow Yeap 2
Siew-Teng Ong 3
Teck-Ming Koh 4
Sie-Tiong Ha 3
1. Department of Materials Science & Engineering, National Chiao Tung University, 1001 Ta- Hsueh Road, Hsinchu 300, Taiwan
2. Liquid Crystal Research Laboratory, School of Chemical Sciences, Universiti Sains Malaysia, 11800 Minden, Penang, Malaysia
3. Department of Chemical Science, Faculty of Science, Universiti Tunku Abdul Rahman, Jln Universiti, Bandar Barat, Kampar, 31900 Perak, Malaysia
4. Department of Science, Faculty of Engineering & Science, Universiti Tunku Abdul Rahman, Jalan Genting Klang, Setapak, 53300 Kuala Lumpur, Malaysia
Abstract
A new homologous series of mesogen, 6-ethoxy-2-(4- alkanoyloxybenzylideneamino)benzothiazoles with even number of carbons (n = 6, 8, 10, 12, 14, 16, 18) at terminal ester chain have been successfully synthesized and isolated. The structure of the title compound was confirmed using elemental analysis and various spectroscopic techniques including FT-IR, 1H NMR and 13C NMR and EI-MS. Phase transition temperatures and thermal data were determined using differential scanning calorimetry. The textures of mesophases were observed under optical polarizing microscope attached with a Linkam hotstage. All the compounds are enantiotropic liquid crystals. While n-hexanoyloxy and n-octanoyloxy derivatives exhibited nematic, ndecanoyloxy to n-octadecanoyloxy derivatives showed smectic C and nematic phases.
Keywords
Liquid crystal
Benzothiazole
Schiff bases
Nematic
Smectic C
Photochemically-Induced N-N Bond Cleavage of N,N-Disubstituted Hydrazides
Efficient Catalytic Synthesis of Pyrazolo[3,4-d]pyrimidine, Pyrazolo[4,3- e][1,2,4]triazolo[1,5-c]pyrimidine, Pyrazolo[4,3-e][1,2,4]triazolo[1,5- c]pyrimidine, Pyrazolo[3,4-d]pyrimidin-4-one derivatives using Heterogeneous Preyssler Heteropolyacid, H14[NaP5W30O110]/SiO2