Synthesis and phase behaviour of hydrogen-bonded liquid crystalline complexes of allyloxybenzoic acid compounds with 4,4′-bipyridine

被引：13

作者：

Wei, Qiang ^{[1
]}

Shi, Lin ^{[1
]}

Yuan, Xiaotao ^{[1
]}

Zhang, Lipei ^{[1
]}

Cao, Hui ^{[1
]}

Yang, Huai ^{[1
]}

机构：

[1] Univ Sci & Technol Beijing, Sch Mat Sci & Engn, Dept Mat Phys & Chem, Beijing 100083, Peoples R China

来源：

LIQUID CRYSTALS | 2007年 / 34卷 / 07期

关键词：

D O I：

10.1080/02678290701379533

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Three kinds of benzoic acid compounds were synthesized and characterized; the corresponding symmetric hydrogen-bonded liquid crystalline complexes based on these benzoic acid compounds and 4,4'-bipyridine (BPy) were then prepared. The existence of the hydrogen bonds was verified by Fourier transform infrared spectroscopy. The liquid crystalline properties of the complexes were demonstrated by polarizing microscopy and differential scanning calorimetry. 4-Allyloxy-2-fluorobenzoic acid and two fluorinated hydrogen-bonded complexes exhibited only nematic phases, whereas the non-fluorinated complex showed both smectic and nematic phases. The clearing points and mesophase thermal range of the complexes decreased with increasing number of lateral fluorine atoms on the rigid core.

引用

页码：855 / 860

页数：6

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