Journal
LIQUID CRYSTALS
Volume 35, Issue 11, Pages 1263-1270Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/02678290802513808
Keywords
naphthalene; bent-shaped monomer; azobenzene; cis-trans isomer; photochromism
Funding
- Fundamental Research Grant [FRGS0006-ST-1/2006]
- Ministry of Education, Malaysia
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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 bis{4-[4-(10-undecenyloxy)phenylazo]benzoate}, 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 -* transition at about 365nm and a low-intensity n-* transition at around 450nm for all compounds. Hence, photochromism can be achieved by the introduction of the azo linkage to banana-shaped liquid crystals molecules.
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