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Synthesis and mesomorphic properties of 6-methoxy- and 6-ethoxy-2-(2-hydroxy-4-alkanoyloxybenzylidenamino)benzothiazoles

Ha, Sie Tiong and Koh, Teck Ming and Yeap, Guan Yeow and Lin, Hong Cheu and Lee, Siew Ling and Win, Yip Foo and Ong, Siew Teng (2010) Synthesis and mesomorphic properties of 6-methoxy- and 6-ethoxy-2-(2-hydroxy-4-alkanoyloxybenzylidenamino)benzothiazoles. Molecular Crystals And Liquid Crystals, 528 (1). pp. 10-22. ISSN 1542-1406

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Official URL: http://dx.doi.org/10.1080/15421406.2010.504510


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.

Item Type:Article
Uncontrolled Keywords:Benzothiazole liquid crystals, lateral hydroxyl group, nematic, structure-property relationship, terminal group
Subjects:Q Science
ID Code:26650
Deposited By: Yanti Mohd Shah
Deposited On:18 Jul 2012 11:47
Last Modified:30 Nov 2018 15:07

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