4′,4″-(二苯并-18-冠-6)二甲酸二芳酯的合成和液晶性质

Synthesis and Liquid Crystal Properties of Diaryl Esters of 4′,4″-(Dibenzo-18-crown-6)dicarboxylic Acids

合成含冠醚结构单元而又具有液晶结构特征的化合物,可能获得兼有冠醚络合性能和液晶特性的新型材料,因而在理论上和应用上都有很好的前景。近年已有几例冠醚衍生物液晶的报道。

The diaryl esters(6A and 6B)of 4′,4″-(dibenzo-18-crown-6)-dicarboxylic acidswere synthesized from dibenzo-18-crown-6.6 B showed nematic properties of liquid crystal.Its m.p,227～228℃,c.p.242℃,and its schlieren texture is shown in Fig.2;ΔH_(mp)=14.1 kcal/mol,ΔH_(op)=0.916 kcal/mol.At 232℃ and 12000 Gs,Δε=0.6B retained thecomplexation ability with potassium ion by qualitative test.The configuration of 6B hasbeen confirmed as anti-form by synthetic method.While the nonliquid crystal isomer 6A isin syn-form,m.p.137～138℃.