Synthesis and characterization of a trefoil-shaped liquid crystal based on 1,3,5-triazine with carbazole groups

被引:21
作者
Bai, R [1 ]
Li, S
Zou, YF
Pan, CY
Xie, P
Kong, B
Zhou, XS
Zhang, RB
机构
[1] Univ Sci & Technol China, Hefei 230026, Anhui, Peoples R China
[2] Chinese Acad Sci, Inst Chem, Ctr Mol Sci, State Key Lab Polymer Phys & Chem, Beijing 100080, Peoples R China
关键词
D O I
10.1080/02678290110086514
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
A trefoil-shaped liquid crystal containing an aromatic hetero-nucleus has been synthesized by the reaction of cyanuric chloride with 3,6-didecanoyl carbazole ( DDC). The molecular structure was characterized by H-1 NMR and C-13 NMR spectroscopy, mass spectroscopy and elemental analysis. The core consists of 1,3,5- triazine directly linked to three carbazole groups. The trefoil-shaped conformation is suggested by molecular modelling. The mesophase was investigated using DSC, X-ray diffraction and polarizing optical microscopy. The X-ray diffraction pattern of a sample cooled slowly from the isotropic state showed sharp peaks in the small angle and wide angle regions implying the existence of a columnar phase with inter- and intra-columnar ordering. An unusual reticular texture similar to a cholesteric texture was observed.
引用
收藏
页码:1873 / 1876
页数:4
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