Synthesis and Mesomorphic Behavior of Calamitic Liquid Crystals with a Biphenyl Moiety
作者:R. C. Tandel、Nilesh K. Patel
DOI:10.1080/15421406.2013.867228
日期:2014.4.13
4-hydroxy-4′-nitrobiphenyl- and methoxy-substituted 4-n-alkoxy cinnamoyl chlorides, and their liquid crystalline properties have been studied. All the members of the series are enantiotropic liquid crystals. The methyl to n-pentyl derivatives exhibit both Smectic A (SmA) and Nematic (N) phases; the higher members, starting with the n-hexyl derivative show only a SmA phase. The plot of transition temperatures versus
通过将 4-羟基-4'-硝基联苯和甲氧基取代的 4-n-烷氧基肉桂酰氯缩合合成了具有联苯部分的新型介晶同源系列,并研究了它们的液晶性质。该系列的所有成员都是对映液晶。甲基到正戊基衍生物表现出近晶 A (SmA) 和向列 (N) 相;从正己基衍生物开始的高级成员仅显示 SmA 相。Sm-N 和 N-各向同性 (Iso) 转变温度曲线的转变温度与烷氧基链中碳原子数的关系图显示出锯齿形图案。平均热稳定性与其他相关同源系列进行比较。极性硝基的引入增加了显着的分子间吸引力,从而稳定了分子取向。这导致系统的热稳定性增加。