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


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