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Synthesis, Liquid Crystal Characterization and Photo-Switching Studies on Fluorine Substituted Azobenzene based Esters

Mei, Gan Siew and A. R., Yuvaraj and Lutfor, M. R. and M. M., Yusoff and Hegde, Gurumurthy (2015) Synthesis, Liquid Crystal Characterization and Photo-Switching Studies on Fluorine Substituted Azobenzene based Esters. RSC Advances, 5 (9). pp. 6279-6285. ISSN 2046-2069

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Abstract

A series offluorinated azobenzene esters have been synthesized and studied by polarized optical microscopy (POM) and UV-Vis spectrophotometry. The–CO2C2H5group with monofluoro-substituted azobenzene exhibited nematic and smectic phases whereas difluoro-substituted azobenzene showed only the nematic phase. The addition of the electronegativefluorine atom plays an important role in photoisomerization of the azobenzene molecules. The monofluoro-substituted azobenzene gave strong photoisomerization in solution as compared with its diflouro counterparts. In these systems,trans–cis isomerization occurred after 4 minutes and cis–trans isomerization occurred after 22 hours which is much longer than expected forfluorine-substituted azobenzene systems. The presented results might have an influence on creating optical data storage devices.

Item Type: Article
Subjects: Q Science > QD Chemistry
Q Science > QC Physics
Faculty/Division: Faculty of Industrial Sciences And Technology
Depositing User: Dr. Gurumurthy Hegde
Date Deposited: 08 Jan 2015 09:01
Last Modified: 12 Feb 2018 08:19
URI: http://umpir.ump.edu.my/id/eprint/8081
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