含胆固醇和 4-(反式-正烷基环己基)苯甲酸结构单元的双液晶基元液晶化合物的合成及其性质

本文合成了一系列含有胆固醇和4-（反式-正烷基环己基）苯甲酸结构单元的新型双液晶基元液晶化合物。这些化合物中两个介晶基元是利用不同长度的氧烷酰基连接在一起。利用FT-IR、MS、1H NMR、POM、DSC 表证了所得化合物的结构和介晶性，并选择几种双液晶基元液晶测定了它们的机械黏度和在主体液晶中的螺旋扭曲力（HTP)。结果表明，绝大多数化合物显示较低相变温度的胆甾相（N*），并且被选择的化合物的平均机械黏度和螺旋扭曲力类似于或优于胆甾醇任酸酯。

Synthesis and Properties of Dimesogenic Compounds Containing Cholesterol and 4‐(trans‐4‐n‐Alkylcyclohexyl)‐benzoic Acid Moieties

A series of novel dimesogenic compounds containing cholesterol and 4‐(trans‐4‐n‐alkylcyclohexyl)benzoic acid moieties were synthesized. The two mesogenic units of these compounds are linked with ω‐oxyalkanoyl spacers of varying lengths. The chemical structure and mesomorphic properties of this series of compounds were characterized by FT‐IR, MS, ¹H NMR, polarizing optical microscopy (POM) and DSC techniques. The average viscosity and helical twisting power (HTP) in host liquid crystals of selected dimesogenic compounds were also measured. It was found that most of the present novel series of compounds exhibited only cholesteric mesophase with lower phase transition temperatures, and the average viscosity and HTP of selected compounds were similar to or superior to cholesteryl nonylate.