標題: | Heterocyclic benzothiazole-based liquid crystals: synthesis and mesomorphic properties |
作者: | Ha, Sie-Tiong Koh, Teck-Ming Lin, Hong-Cheu Yeap, Guan-Yeow Win, Yip-Foo Ong, Siew-Teng Sivasothy, Yasodha Ong, Lay-Khoon 材料科學與工程學系 Department of Materials Science and Engineering |
關鍵字: | 2-(4-alkanoyloxybenzylidenamino)benzothiazole;2-(2-hydroxy-4-alkanoyloxybenzylidenamino)benzothiazole;Schiff base;smectic A;structure-property relationship |
公開日期: | 2009 |
摘要: | Two homologous series of 2-(4-alkanoyloxybenzylidenamino)benzothiazoles and 2-(2-hydroxy-4-alkanoyloxybenzylidenamino)benzothiazoles were synthesised and characterised. Their molecular structures differed wherein the latter comprised a lateral hydroxyl group, unlike the former. Spectroscopic techniques such as FT-IR, 1H 13C NMR and mass spectrometry together with elemental analysis were employed to elucidate the molecular structures. The transition temperatures and their mesophases were determined by differential scanning calorimetry, optical polarising microscopy and X-ray diffraction techniques. Members with decanoyloxy till hexadecanoloxy chain in the series without the lateral hydroxyl group each exhibited a smectic A phase, while those in the series with the lateral hydroxyl group were non-mesogenic. The mesomorphic properties of the present series were compared with other structurally related series to establish the chemical structure-mesomorphic properties relationship. |
URI: | http://hdl.handle.net/11536/7823 http://dx.doi.org/10.1080/02678290903131278 |
ISSN: | 0267-8292 |
DOI: | 10.1080/02678290903131278 |
期刊: | LIQUID CRYSTALS |
Volume: | 36 |
Issue: | 9 |
起始頁: | 917 |
結束頁: | 925 |
顯示於類別: | 期刊論文 |