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Liquid Crystals Volume 34, 2007 - Issue 7
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Original Articles

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

Qiang Wei Department of Materials Physics and Chemistry, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, PR China
,
Lin Shi Department of Materials Physics and Chemistry, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, PR China
,
Xiaotao Yuan Department of Materials Physics and Chemistry, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, PR China
,
Lipei Zhang Department of Materials Physics and Chemistry, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, PR China
,
Hui Cao Department of Materials Physics and Chemistry, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, PR China
&
Huai Yang Department of Materials Physics and Chemistry, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, PR ChinaCorrespondence[email protected]
Pages 855-860 | Received 06 Oct 2006, Accepted 15 Mar 2007, Published online: 18 Jul 2007
 
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Abstract

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.

Acknowledgements

This research was supported by the National High Technology 863 Program of China under Grant No. 2003AA327050 and the Major Project of Ministry of Education of the People's Republic of China under Grant No.104187.

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