Synthesis, Liquid Crystal Characterization and Photo-Switching Studies on Fluorine Substituted Azobenzene based Esters
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...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English English |
| Published: |
Royal Society of Chemistry
2015
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| Subjects: | |
| Online Access: | http://umpir.ump.edu.my/id/eprint/8081/ http://umpir.ump.edu.my/id/eprint/8081/ http://umpir.ump.edu.my/id/eprint/8081/ http://umpir.ump.edu.my/id/eprint/8081/1/fist-2015-lutfor-synthesis%20liquid%20crystal%20characterization-full.pdf http://umpir.ump.edu.my/id/eprint/8081/7/Synthesis%2C%20Liquid%20Crystal%20Characterization%20and%20Photo-Switching%20Studies%20on%20Fluorine%20Substituted%20Azobenzene%20Based%20Esters.pdf |
| Summary: | 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. |
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