摘要 制备了两组式 4-(4'-己氧基)苯基偶氮-2-(和 3)甲基苯基-4″-取代的苯甲酸酯 (I a-e 和 II a-e ) 并研究了它们的中间相行为. 每组由五个衍生物组成,它们的区别在于末端极性取代基 X 在 CH 3 O、CH 3 、Br、NO 2 和 CN 之间变化。还制备了另外两个异构基团 III a-e 和 IV a-e,它们交换了末端取代基 X 和 C 6 H 13 O,并对其进行了类似的表征。构建了四种不同类型的二元相图,其中两种组分都是来自四组 (I – IV) 中每一组的相应异构体。在 I / II 和 III / IV 两种二元混合物中,这两种组分是位置异构体,其侧甲基的位置不同,而在其他两个系统中,
Effects of Different Terminal Substituents on the Mesomorphic Behavior of Some Azo-Schiff Base and Azo-Ester-Based Liquid Crystals
作者:B. T. Thaker、J. B. Kanojiya、R. S. Tandel
DOI:10.1080/15421406.2010.504632
日期:2010.10.14
In order to investigate the influence of the terminalsubstitution on mesomorphism, two new series of azo-Schiff base and azo-ester liquidcrystals having the following structures have been synthesized. All the compounds possess mesomorphic properties. In series A compounds A1 and A3 exhibit only a nematic mesophase, whereas compounds A2, A4, A5, A6, A7, A8, A9, and A10 exhibit a smectic as well as