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化学学报
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化学学报 ›› 2005, Vol. 63 ›› Issue (5): 427-433. 上一篇    下一篇

研究论文

新型含氧亚甲基和亚胺桥键的液晶化合物的合成及介晶性

赵可清*1，胡平1，汪必琴1，许洪波1，李权1，张良辅2   

  1. (1四川师范大学化学学院 成都 610066)
    (2中国科学院成都有机化学研究所 成都 610041)
  • 投稿日期:2004-04-22 修回日期:2004-11-08 发布日期:2010-12-10
  • 通讯作者: 赵可清

Synthesis and Mesomorphism of New Liquid Crystals with CH2O and CH＝N Linkages

ZHAO Ke-Qing* a, HU Ping1, WANG Bi-Qin1, XU Hong-Bo1, LI Quan1, ZHANG Liang-Fu2   

  1. (1 College of Chemistry, Sichuan Normal University, Chengdu 610066)
    (2 Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041)
  • Received:2004-04-22 Revised:2004-11-08 Published:2010-12-10
  • Contact: ZHAO Ke-Qing

PDF

1157

被引次数

31

报道一类新的、结构通式为MeO2CC6H4CH2OC6H4CH＝NC6H4Y, Y＝OCnH2n＋1, Me, Cl, Br, NO2, H 的棒状液晶化合物的合成. 通过DSC和偏光显微镜对其介晶性研究发现, 除Y＝H外, 这些化合物均具有介晶性. 当Y为非烷氧基时, 呈向列相液晶; 当Y为较短的烷氧基时(n＝1～3), 液晶化合物具有向列相(N); Y为较长烷氧基时(n＝4～16 ), 液晶化合物只有近晶B相(SB)和近晶A相(SA); SA-I相变的熵变随烷氧链原子数而奇-偶变化, 但与N-I相变的“奇-偶效应”相反.

关键词: 液晶, 棒状分子, 向列相, 近晶B相, 近晶A相, 奇-偶效应

A homolog of new liquid crystals with the structure of MeO2CC6H4CH2OC6H4CH＝NC6H4Y, Y＝OCnH2n＋1 (n＝1～12, 14, 16 ), Me, Cl, Br, NO2 and H were synthesized and their mesomorphic properties were studied through differential scanning calorimetry (DSC) and polarizing optical microscopy (POM). The result shows that molecules with non-alkyloxy substituent are nematogenic and short alkyloxy chains (n＝1～3 ) in the homologue lead to nematic phase with odd-even effect, the molecules with longer alkyloxy chains (n＝4～16) present smectic A and B phases, while the entropy changes of SA to isotropic liquid have opposite "odd-even effect" to those of the nematic to isotropic transition.

Key words: liquid crystal, calamitic molecule, nematic, smectic B, smectic A, odd-even effect