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 |
顯示於類別: | 期刊論文 |