Synthesis and Properties of Novel Liquid Crystal Compounds Containing Pyridine Ring

doi:10.11944/j.issn.1000-0518.2016.05.150314

Chinese Journal of Applied Chemistry ›› 2016, Vol. 33 ›› Issue (5): 542-548.DOI: 10.11944/j.issn.1000-0518.2016.05.150314

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Synthesis and Properties of Novel Liquid Crystal Compounds Containing Pyridine Ring

MO Lingchao^a^b,LI Jian^a^b,GUO Zhaoqi^a^b,LI Juanli^a^b,HU Minggang^a^b,AN Zhongwei^a^b^c^*()

^a State Key Laboratory of Fluorine & Nitrogen Chemicals
^b Center for Optic-Electronic Materials,Xi'an Modern Chemistry Research Institute,Xi'an 710065,China
^c Key Laboratory of Applied Surface and Colloid Chemistry of Ministry of Education,School of Materials Science and Engineering,Shaanxi Normal University,Xi'an 710100,China

Received:2015-08-31 Accepted:2015-12-10 Published:2016-04-29 Online:2016-04-29
Contact: AN Zhongwei

Abstract

Abstract:

Four new bi-aryl and tri-aryl compounds containing pyridine ring were synthesized by using 2-bromopyridine-5-carbaldehyde and 5-bromopyridine-2-carbaldehyde as starting materials. The total yields are around 20%~30%. Thermal analysis results show that the bi-aryl compounds exhibit no mesophase, while the tri-aryl compounds exhibit nematic phase during both heating and cooling process. For the compound with nitrogen atoms located at the ortho position of n-butyl group, its melting point is decreased by 11.7 ℃ and its clearing point is increased by 6.3 ℃, and the mesophase range is broadened by 18 ℃, compared with the reference terphenyl compound(2c). Optic-electronic property analysis results show that the birefringence is improved when one of benzene ring in the reference compounds(1c or 2c) is replaced by with pyridine ring. Besides, the dielectric anisotropy values are increased when the nitrogen atoms locate at ortho position of n-butyl, and the threshold voltage and saturation voltage are decreased. The rule of the dielectric anisotropy variation is explained by conformation energy calculation of three-ring isomers.

Key words: pyridine ring, synthesis, dielectric anisotropy, liquid crystal

MO Lingchao, LI Jian, GUO Zhaoqi, LI Juanli, HU Minggang, AN Zhongwei. Synthesis and Properties of Novel Liquid Crystal Compounds Containing Pyridine Ring[J]. Chinese Journal of Applied Chemistry, 2016, 33(5): 542-548.

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Synthesis and Properties of Novel Liquid Crystal Compounds Containing Pyridine Ring

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