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化学学报
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化学学报 ›› 2007, Vol. 65 ›› Issue (14): 1368-1376. 上一篇    下一篇

研究论文

半氟烃链苯并菲盘状液晶的合成及其介晶性

陈红梅, 赵可清*, 胡平, 汪必琴   

  1. (四川师范大学化学与材料科学学院 成都 610066)
  • 投稿日期:2006-09-13 修回日期:2007-01-10 发布日期:2007-07-28
  • 通讯作者: 赵可清

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

CHEN Hong-Mei; ZHAO Ke-Qing*; HU Ping; WANG Bi-Qin   

  1. (College of Chemistry and Materials Science, Sichuan Normal University, Chengdu 610066, China)
  • Received:2006-09-13 Revised:2007-01-10 Published:2007-07-28
  • Contact: ZHAO Ke-Qing

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被引次数

39 | 5

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.

关键词: 苯并菲, 盘状液晶, 全氟烃链, 柱状相

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.

Key words: triphenylene, discotic liquid crystal, perfluorinated chain, columnar mesophase