Chin. J. Org. Chem. ›› 2015, Vol. 35 ›› Issue (12): 2575-2582.DOI: 10.6023/cjoc201504026 Previous Articles     Next Articles



毛志鹏a, 游红军a, 王坤a, 张智勇a, 关金涛a, 戴志群a, 项颖b   

  1. a 武汉轻工大学化学与环境工程学院 武汉 430023;
    b 广东工业大学信息工程学院 广州 510006
  • 收稿日期:2015-04-18 修回日期:2015-07-05 发布日期:2015-08-25
  • 通讯作者: 张智勇
  • 基金资助:

    国家自然科学基金(Nos. 11074054, 11374067)资助项目.

Synthesis and Property of Unsymmetric Bent-core Liquid Crystals Based on 2,5-Disubstitueted-1,3,4-oxadiazole

Mao Zhipenga, You Hongjuna, Wang Kuna, Zhang Zhiyonga, Guan Jintaoa, Dai Zhiquna, Xiang Yingb   

  1. a Department of Chemistry and Environmental Engineering, Wuhan Polytechnic University, Wuhan 430023;
    b Department of Technology Institute and Information Engineering, Guangdong Polytechnic University, Guangzhou 510006
  • Received:2015-04-18 Revised:2015-07-05 Published:2015-08-25
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Nos. 11074054, 11374067).

Two novel series of bent-core liquid crystals (9a~9e and 10a~10e) were prepared with a central bent core based on 2,5-disubstitueted-1,3,4-oxadiazole, ester group bridge (coo), alkyl tails with different carbon numbers (n=5~9), and one side wing substituted by fluorine atom. The structures of the target compounds were confirmed by IR, 1H NMR, 13C NMR, MS, and their transition temperatures and phase textures were investigated by using differential scanning calorimetric (DSC) and polarizing optical microscopy (POM). The result suggested that all target compounds had right chemical structure. All compounds 9a~9e and 10a~10e exhibited nematic phase and existed wide temperature range of nematic phase. The widest range of nematic phase was 78 ℃. The temperature range of nematic phase of compounds 9a~9e with lateral monofluoro-substituted benzene was more narrow than compounds 10a~10e with lateral difluoro-substituted benzene. Moreover, compounds 9a~9e showed odd-even effect.

Key words: oxadiazole, unsymmetric bent-core liquid crystal, nematic phase, synthesis