Synthesis and Characterization of Liquid Crystalline Azobenzene Chromophores with Fluorobenzene Terminal

M. M., Yusoff and Lutfor, M. R. and Hegde, Gurumurthy and Mahrokh, Azazpour and Sandeep, Kumar (2013) Synthesis and Characterization of Liquid Crystalline Azobenzene Chromophores with Fluorobenzene Terminal. Journal of Fluorine Chemistry, 156. pp. 230-235. ISSN 0022-1139. (Published)

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DOI/Official URL: http://dx.doi.org/10.1016/j.jfluchem.2013.10.004

Abstract

Two series of fluorine-substituted benzoate ester type rod-shaped liquid crystals incorporating the azobenzene as side arm linked with terminal double bonds as polymerizable functional groups were synthesized and characterized by polarized-light optical microscopy (POM), differential scanning calorimetry (DSC) and UV–visible spectroscopy investigations. Thus, rod-shaped monomers, namely 4a and 4b having odd and even number of carbon in the terminal group exhibited nematic phase and SmA type phase was found at lower temperature. Compound 5 showed nematic phase whereas compound 6 showed SmA phase. These rod-shaped molecules exhibit strong photoisomerization behaviour in solution. The photoswitching properties of the compounds showed trans to cis isomerization in about 10 s, whereas the reverse process takes place about 120 min in solutions. Proposed materials may have potential to use it in optical storage devices.

Item Type:	Article
Additional Information:	Impact Factor: 1.939
Uncontrolled Keywords:	Azobenzene chromophores; Fluorine-substituted benzene; Nematic phase; Smectic phase; Photo-switching property
Subjects:	Q Science > Q Science (General) Q Science > QD Chemistry
Faculty/Division:	Faculty of Industrial Sciences And Technology
Depositing User:	Prof. Dr. Mashitah Mohd Yusoff
Date Deposited:	31 Dec 2013 06:49
Last Modified:	12 Feb 2018 08:22
URI:	http://umpir.ump.edu.my/id/eprint/4697
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