標題: Synthesis of new schiff base ester liquid crystals with a benzothiazole core
作者: Ha, Sie-Tiong
Koh, Teck-Ming
Lee, Siew-Ling
Yeap, Guan-Yeow
Lin, Hong-Cheu
Ong, Siew-Teng
材料科學與工程學系
Department of Materials Science and Engineering
關鍵字: 6-methoxy-2-(4-alkanoyloxybenzylidenamino)benzothiazole;Schiff bases;nematic;smectic C
公開日期: 2010
摘要: 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 (Cn-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.
URI: http://hdl.handle.net/11536/6104
http://dx.doi.org/10.1080/02678291003710425
ISSN: 0267-8292
DOI: 10.1080/02678291003710425
期刊: LIQUID CRYSTALS
Volume: 37
Issue: 5
起始頁: 547
結束頁: 554
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