含有3H-苯并吡喃-2-酮骨架化合物的液晶性和凝胶性能

Liquid Crystal and Gelation Properties of Compounds with a Chromen-2-one Skeleton

在苯并吡喃-2-酮-6-基-4-烷氧基苯甲酸酯烷氧链一侧增加了1个苯环,合成了4-烷氧基-双苯基-4′-羧酸酯(4-alkoxy-biphenyl-4′-carboxy-lates,2-n)化合物。研究了化合物2-n的液晶性和凝胶性能,与化合物1-n相比,化合物2-n显示互变的向列相,并且能够同多种有机溶剂形成凝胶。测试了凝胶剂在各种溶剂中的临界凝胶浓度。扫描电子显微镜观察结果表明,干凝胶呈纤维状三维网络结构。在凝胶的形成中,由于3H-苯并吡喃-2-酮衍生物的内酯骨架具有较大的宽度和偶极矩,因而引起偶极作用。偶极作用是3H-苯并吡喃-2-酮衍生物具有凝胶性能的原因。

4-Alkoxy-biphenyl-4＇-carboxy-lates（2-n） was synthesized by introducing a benzyl ring on the side of alkoxy chain of chromen-2-one-6-yl 4-alkoxy benzoates （1-n）. The liquid crystalline and gelation of compound 2-n were determined. Comparing with compound l-n, compound 2-n exhibits enantiotropic nematic phase and can form gels with various organic solvents. The critical gel concentrations in various solvents were determined and the three-dimensional network structure consisting of xerogel fibrils was observed with a scanning electron microscope. Conclusively, intermolecular interactions around lactone moiety having a broad shape and a large dipole moment play important roles in enhancing the broad gelling ability.