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通过室温反应合成了系列C3和C5烷基取代的多环单酯基苯甲醛类液晶,研究了室温羧酸氯化有效抑制反式环己烷构型转化的机理,讨论了不同的端基、环体系对化合物液晶相变区间、焓变及熵变的影响。结果表明,该类芳香醛化合物端基与环体系的改变使化合物的液晶相温度范围、焓变及熵变呈现规律性的改变,且环体系对化合物液晶性质的影响远大于末端烷基。
A series of C3 and C5 alkyl-substituted polycyclic monoester-based benzaldehydes were synthesized at room temperature. The mechanism of effectively controlling the conversion of trans-cyclohexane configuration by chlorinated carboxylic acids at room temperature was studied. The effects of different terminal groups, Ring system on the liquid crystal phase transition, enthalpy change and entropy change. The results show that the change of terminal group and ring system of these aromatic aldehyde compounds changes the liquid crystal phase temperature range, enthalpy change and entropy change regularly, and the effect of ring system on the liquid crystal properties is far greater than the terminal alkyl group.