Synthesis and Photoswitching Properties of Azobenzene Liquid Crystals with a Pentafluorobenzene Terminal
The fluorine-substituted benzoate ester rod-shaped liquid crystals containing an azobenzene side chain linked with terminal double bonds were synthesized and characterized. The mesophase and photoswitching properties were determined by polarizing optical microscopy (POM), differential scanning calor...
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Elsevier Ltd
2014
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| Online Access: | http://umpir.ump.edu.my/id/eprint/9539/ http://umpir.ump.edu.my/id/eprint/9539/1/Synthesis%20and%20photoswitching%20properties%20of%20azobenzene%20liquid%20crystals%20with%20a%20pentafluorobenzene%20terminal.pdf |
| _version_ | 1848818514918375424 |
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| author | Lutfor, M. R. Hegde, Gurumurthy Sarkar, Shaheen M. M. M., Yusoff |
| author_facet | Lutfor, M. R. Hegde, Gurumurthy Sarkar, Shaheen M. M. M., Yusoff |
| author_sort | Lutfor, M. R. |
| building | UMP Institutional Repository |
| collection | Online Access |
| description | The fluorine-substituted benzoate ester rod-shaped liquid crystals containing an azobenzene side chain linked with terminal double bonds were synthesized and characterized. The mesophase and photoswitching properties were determined by polarizing optical microscopy (POM), differential scanning calorimetry (DSC) and UV–visible spectrometry. The rod-shaped compound 4a having an odd number of carbon atoms in the alkyl chains exhibits nematic phase and SmA type phase whereas compound 4b having an even number of carbon atoms showed only nematic phase. Both fluorine-containing compounds 4c and 4d showed only SmA type phases. The photoswitching properties of these compounds showed a rate of trans to cis isomerization ranging 19–20 s, whereas reverse process took around 230 min in solution. These materials may be ideal in the field of optically rewritable applications where both on and off rates should be crucial. |
| first_indexed | 2025-11-15T01:38:53Z |
| format | Article |
| id | ump-9539 |
| institution | Universiti Malaysia Pahang |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-15T01:38:53Z |
| publishDate | 2014 |
| publisher | Elsevier Ltd |
| recordtype | eprints |
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| spelling | ump-95392018-02-06T07:58:38Z http://umpir.ump.edu.my/id/eprint/9539/ Synthesis and Photoswitching Properties of Azobenzene Liquid Crystals with a Pentafluorobenzene Terminal Lutfor, M. R. Hegde, Gurumurthy Sarkar, Shaheen M. M. M., Yusoff Q Science (General) The fluorine-substituted benzoate ester rod-shaped liquid crystals containing an azobenzene side chain linked with terminal double bonds were synthesized and characterized. The mesophase and photoswitching properties were determined by polarizing optical microscopy (POM), differential scanning calorimetry (DSC) and UV–visible spectrometry. The rod-shaped compound 4a having an odd number of carbon atoms in the alkyl chains exhibits nematic phase and SmA type phase whereas compound 4b having an even number of carbon atoms showed only nematic phase. Both fluorine-containing compounds 4c and 4d showed only SmA type phases. The photoswitching properties of these compounds showed a rate of trans to cis isomerization ranging 19–20 s, whereas reverse process took around 230 min in solution. These materials may be ideal in the field of optically rewritable applications where both on and off rates should be crucial. Elsevier Ltd 2014 Article PeerReviewed application/pdf en http://umpir.ump.edu.my/id/eprint/9539/1/Synthesis%20and%20photoswitching%20properties%20of%20azobenzene%20liquid%20crystals%20with%20a%20pentafluorobenzene%20terminal.pdf Lutfor, M. R. and Hegde, Gurumurthy and Sarkar, Shaheen M. and M. M., Yusoff (2014) Synthesis and Photoswitching Properties of Azobenzene Liquid Crystals with a Pentafluorobenzene Terminal. Chinese Chemical Letters, 25 (12). pp. 1611-1614. ISSN 1001-8417 (print); 1878-5964 (online). (Published) http://www.sciencedirect.com/science/article/pii/S1001841714003027# DOI: 10.1016/j.cclet.2014.06.025 |
| spellingShingle | Q Science (General) Lutfor, M. R. Hegde, Gurumurthy Sarkar, Shaheen M. M. M., Yusoff Synthesis and Photoswitching Properties of Azobenzene Liquid Crystals with a Pentafluorobenzene Terminal |
| title | Synthesis and Photoswitching Properties of Azobenzene Liquid Crystals with a Pentafluorobenzene Terminal |
| title_full | Synthesis and Photoswitching Properties of Azobenzene Liquid Crystals with a Pentafluorobenzene Terminal |
| title_fullStr | Synthesis and Photoswitching Properties of Azobenzene Liquid Crystals with a Pentafluorobenzene Terminal |
| title_full_unstemmed | Synthesis and Photoswitching Properties of Azobenzene Liquid Crystals with a Pentafluorobenzene Terminal |
| title_short | Synthesis and Photoswitching Properties of Azobenzene Liquid Crystals with a Pentafluorobenzene Terminal |
| title_sort | synthesis and photoswitching properties of azobenzene liquid crystals with a pentafluorobenzene terminal |
| topic | Q Science (General) |
| url | http://umpir.ump.edu.my/id/eprint/9539/ http://umpir.ump.edu.my/id/eprint/9539/ http://umpir.ump.edu.my/id/eprint/9539/ http://umpir.ump.edu.my/id/eprint/9539/1/Synthesis%20and%20photoswitching%20properties%20of%20azobenzene%20liquid%20crystals%20with%20a%20pentafluorobenzene%20terminal.pdf |