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Title: Liquid crystalline banana-shaped monomers derived from 2,7-naphthalene: synthesis and properties
Authors: Rahman, Md Lutfor
Asik, Jahimin
Kumar, Sandeep
Tschierske, Carsten
Keywords: naphthalene
bent-shaped monomer
cis-trans isomer
Issue Date: Nov-2008
Publisher: Taylor & Francis
Citation: Liquid Crystals, 2008, Vol. 35(11), p1263-1270
Abstract: Three banana-shaped monomers, i.e. 2,7-naphthalene bis[4-(4-allyloxyphenylazo)-benzoate], 2,7-naphthalene bis[4-(4-allyloxy-3-fluorophenylazo)benzoate] and 2,7-naphthalene bislcub4-[4-(10-undecenyloxy)phenylazo]benzoatercub, containing azobenzene as side arms, 2,7-dihydroxynaphthalene as central units and terminal double bonds as polymerisable functional groups, were synthesised and their mesophase behaviour investigated. Polarizing optical microscopy and DSC measurements reveal that all compounds exhibit nematic mesophases. The absorption spectrum of the trans-azobenzene groups displays a high-intensity π-π* transition at about 365 nm and a low-intensity n-π* transition at around 450 nm for all compounds. Hence, photochromism can be achieved by the introduction of the azo linkage to banana-shaped liquid crystals molecules.
Description: Restricted Access.
ISSN: 0267-8292
1366-5855 (Online)
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Copyright: 2008 Taylor & Francis
Appears in Collections:Research Papers (SCM)

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