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Azo containing thiophene based prop-2-enoates for photoalignment of a nematic liquid crystal

Journal article
Authors Gurumurthy Hegde
Rasha Mohamed Ata Alla
A. Matharu
Lachezar Komitov
Published in Journal of Materials Chemistry C
Volume 1
Issue 22
Pages 3600-3605
ISSN 2050-7526
Publication year 2013
Published at Department of Physics (GU)
Pages 3600-3605
Language en
Links dx.doi.org/10.1039/c3tc00921a
Keywords alignment
Subject categories Physical Sciences

Abstract

The ability of suitably derived prop-2-enoates from 3-(thiophen-2-yl)- and 3-(thiophen-3-yl)-prop-2-enoic acid and appropriately fluorinated and non-fluorinated 4-[(4-alkoxyphenyl)diazenyl]phenols to promote excellent photoalignment of a bulk commercial nematic liquid crystal is reported. The performed study showed that the photoalignment of the liquid crystal is influenced by the number and disposition of fluoro-substituents and the position of attachment of the terminal thiophene moiety, either 2- or 3-substituted, in the molecular structure of the alignment material. Inclusion of a lateral fluoro-substituent(s) induces an excellent photoalignment whereas the non-fluorinated counterpart tends to give an unsatisfactory alignment. 3-Substituted thiophenes give a better photoalignment than their 2-substituted isomeric counterparts. A prototype display, which contains an alignment layer made from one of the proposed materials, possessing good alignment ability, is presented in order to demonstrate the application potential of these materials in LCDs.

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