標題: Synthesis and Mesomorphic Properties of 6-Methoxy- and 6-Ethoxy-2-(2-Hydroxy-4-Alkanoyloxybenzylidenamino)Benzothiazoles
作者: Ha, Sie-Tiong
Koh, Teck-Ming
Yeap, Guan-Yeow
Lin, Hong-Cheu
Lee, Siew-Ling
Win, Yip-Foo
Ong, Siew-Teng
材料科學與工程學系
Department of Materials Science and Engineering
關鍵字: Benzothiazole liquid crystals;lateral hydroxyl group;nematic;structure-property relationship;terminal group
公開日期: 2010
摘要: Two new series of Schiff base thermotropic liquid crystals, 6-methoxy-2-(2-hydroxy-4-alkanoyloxybenzylidenamino)benzothiazoles and 6-ethoxy-2-(2-hydroxy-4-alkanoyloxybenzylidenamino)benzothiazoles, comprising different terminal groups, a methoxyl and ethoxyl group, respectively, were synthesized. Structural elucidation was carried out using elemental analysis and spectroscopic techniques such as Fourier transform infrared (FTIR), 1H and 13C nuclear magnetic resources (NMR), and mass spectrometry. The mesomorphic properties and thermal stabilities of the title compounds were studied by using differential scanning calorimetry, optical polarizing microscopy, and thermogravimetric analysis. No liquid-crystal phases were observed for the short-chain members (n=2 and 3) in both series, and the remaining members all exhibited nematic phase with Schlieren or marble-like textures. Effects of the lateral hydroxyl group, terminal group, and the length of the terminal alkanoyloxy chain on the mesomorphic properties are discussed. Structure-property relationships were established upon comparison with other structurally related compounds.
URI: http://hdl.handle.net/11536/6015
http://dx.doi.org/10.1080/15421406.2010.504510
ISSN: 1542-1406
DOI: 10.1080/15421406.2010.504510
期刊: MOLECULAR CRYSTALS AND LIQUID CRYSTALS
Volume: 528
起始頁: 10
結束頁: 22
顯示於類別:期刊論文


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