Issue 44, 2005
From the journal:

Journal of Materials Chemistry

Synthesis and physical properties of novel liquid crystals containing pyranobenzopyrans as a core structure†

Seiichi Inoue,*a   Takayoshi Yanai,a   Shinji Ando,b   Akinori Nakazawa,a   Kiyoshi Honda,b   Yujiro Hoshinoa  and  Tomoyuki Asaic  

* Corresponding authors

a Graduate School of Environment Information Sciences, Yokohama National University, 79-7 Tokiwadai, Hodogaya-ku, Yokohama, Japan
E-mail: s-inoue@ynu.ac.jp
Fax: +81 45 335 1536
Tel: +81 45 339 3966

b Graduate School of Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama, Japan

c Seimi Chemical Co. Ltd, 3-2-10 Chigasaki, Chigasaki-shi, Japan

Abstract

The synthesis and physical properties of pyranobenzopyran ring system have been studied as a core structure of novel liquid crystal (LC) compounds. Substituted pyranobenzopyrans having an alkoxy group on the A ring (benzene ring) exhibited smectic and nematic phase, those having a fluoro-substituted phenyl group on the A ring exhibited wider range of smectic phase. When the latter are added to a base LC mixture (ZLI-1565, Merck), the clearing point was raised. Interestingly, pyranobenzopyrans having a trifluoromethyl phenyl group or a cyano group on the A ring showed an extremely large positive dielectric anisotropy.

Graphical abstract: Synthesis and physical properties of novel liquid crystals containing pyranobenzopyrans as a core structure

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Article information

DOI
https://doi.org/10.1039/B510555B
Article type
Paper
Submitted
25 Jul 2005
Accepted
01 Sep 2005
First published
27 Sep 2005

J. Mater. Chem., 2005,15, 4746-4752

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Synthesis and physical properties of novel liquid crystals containing pyranobenzopyrans as a core structure

S. Inoue, T. Yanai, S. Ando, A. Nakazawa, K. Honda, Y. Hoshino and T. Asai, J. Mater. Chem., 2005, 15, 4746 DOI: 10.1039/B510555B

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