半氟烃链苯并菲盘状液晶的合成及其介晶性  

Synthesis and Mesomorphism of Semi-fluorinated Chain Contained Triphenylene Discotic Liquid Crystals

作　　者：陈红梅[1] 赵可清[1] 胡平[1] 汪必琴[1] 

机构地区：[1]四川师范大学化学与材料科学学院,成都610066

出　　处：《化学学报》2007年第14期1368-1376,共9页Acta Chimica Sinica

基　　金：国家自然科学基金(Nos.50473062;50673069);四川省青年基金(No.04ZQ026-044)资助项目

摘　　要：全氟烃链的憎氟效应(fluorophobic effect)可有效地促使棒状分子形成近晶相,并稳定液晶相.为进一步探讨氟效应对盘状分子介晶性的影响,合成了一系列全氟酯链的苯并菲化合物C18H6(OCnH2n+1)5(OCOC2H4C6F13)(a),以及另一系列相对应的不含氟化合物C18H6(OCnH2n+1)5(OCOC8H17)(b),n=4～9.DSC检测和偏光显微镜观察显示两类化合物都为柱状相热致型液晶.化合物a与相对应的化合物b比较,其熔点和清亮点上升,柱状相的热稳定性增强.The fluorophobic effect of highly fluorinated alkyl terminal chain of rod-like molecule can efficiently promote the formation of semctic phase and improve the stability of mesophase. In order to investigate the influence of semi-fluorinated chain on mesomorphism of disctoic molecules, a series of new triphenylene derivatives C18H6（OCnH2n＋1）5（OCOC2H4C6F13） with a semi-fluorinated chain, and their hydrocarbon analogues, C18H6（OCnH2n＋1）5（OCOC8H17）, n=4-9, were synthesized. Studies of DSC and POM texture observations revealed that these triphenylene derivatives showed enantiotropic hexagonal columnar mesophases. Compared with the hydrocarbon ester chain, the semi-fluorinated ester chain increased the melting points and clearing points, and stabilized the columnar mesophase of triphenylene discogens.

关 键 词：苯并菲 盘状液晶 全氟烃链 柱状相 

分 类 号：O621.3[理学—有机化学]