双环己基多环体系液晶的合成与性质

Synthesis and properties of liquid crystals with bicyclohexyl multiring systems

以顺式结构的４－（４’－烷基－反－环己基）－环己烷羧酸构型转换、分离生成的反式异构体为原料，合成了两个系列双环己基四环体系液晶化合物。用ＩＲ、ＮＭＲ仪等确定了这些化合物的结构，用ＤＳＣ和偏光显微镜确定了这些化合物的相态和相转变温度，讨论了化合物结构与性质的关系。

Two series (Ⅰ,Ⅱ ), eight compounds were synthesized from 4-(4'-alkyl- trans-cyclohexyl)-trans-cyclohexane carboxylic acid which was transformed and separated from 4-(4'-alkyl-trans-cyclohexyl )-cyclohexane carboxylic acid: 4'-(p-propyl-trans-cyclohexyl ) phenyl-4'-(p-alkyl-trans-cyclohexyl methyl ether (Ⅰ ), 4-(p-alkyl- trans-cyclohexyl )-trans-cyclohexane carboxylic acid-4'-(p-propyl-trans-cycloh ) phenyl ester (Ⅱ). The structures of these two series compounds were determined by elemental analysis, IR, NMR and MS. Their phase transition temperatures were measured by DSC, and the mesomorphic textures were recognized by polarized microscopy. The relationships between the structures and properties of the molecules are discussed.