Synthesis and Photoswitching Properties of Aznzene 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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Main Authors:	Lutfor, M. R., Hegde, Gurumurthy, Sarkar, Shaheen M., M. M., Yusoff
Format:	Article
Published:	Chinese Chemical Society 2014
Subjects:	QD Chemistry
Online Access:	http://umpir.ump.edu.my/id/eprint/8105/ http://umpir.ump.edu.my/id/eprint/8105/ http://umpir.ump.edu.my/id/eprint/8105/

id	ump-8105
recordtype	eprints
spelling	ump-81052018-02-06T07:39:53Z http://umpir.ump.edu.my/id/eprint/8105/ Synthesis and Photoswitching Properties of Aznzene Liquid Crystals with a Pentafluorobenzene Terminal Lutfor, M. R. Hegde, Gurumurthy Sarkar, Shaheen M. M. M., Yusoff QD Chemistry 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. Chinese Chemical Society 2014-07-03 Article PeerReviewed Lutfor, M. R. and Hegde, Gurumurthy and Sarkar, Shaheen M. and M. M., Yusoff (2014) Synthesis and Photoswitching Properties of Aznzene Liquid Crystals with a Pentafluorobenzene Terminal. Chinese Chemical Letters, 25 (2). pp. 1611-1614. ISSN 1001-8417 (print); 1878-5964 (online) http://dx.doi.org/10.1016/j.cclet.2014.06.025 DOI: 10.1016/j.cclet.2014.06.025
repository_type	Digital Repository
institution_category	Local University
institution	Universiti Malaysia Pahang
building	UMP Institutional Repository
collection	Online Access
topic	QD Chemistry
spellingShingle	QD Chemistry Lutfor, M. R. Hegde, Gurumurthy Sarkar, Shaheen M. M. M., Yusoff Synthesis and Photoswitching Properties of Aznzene Liquid Crystals with a Pentafluorobenzene Terminal
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.
format	Article
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.
title	Synthesis and Photoswitching Properties of Aznzene Liquid Crystals with a Pentafluorobenzene Terminal
title_short	Synthesis and Photoswitching Properties of Aznzene Liquid Crystals with a Pentafluorobenzene Terminal
title_full	Synthesis and Photoswitching Properties of Aznzene Liquid Crystals with a Pentafluorobenzene Terminal
title_fullStr	Synthesis and Photoswitching Properties of Aznzene Liquid Crystals with a Pentafluorobenzene Terminal
title_full_unstemmed	Synthesis and Photoswitching Properties of Aznzene Liquid Crystals with a Pentafluorobenzene Terminal
title_sort	synthesis and photoswitching properties of aznzene liquid crystals with a pentafluorobenzene terminal
publisher	Chinese Chemical Society
publishDate	2014
url	http://umpir.ump.edu.my/id/eprint/8105/ http://umpir.ump.edu.my/id/eprint/8105/ http://umpir.ump.edu.my/id/eprint/8105/
first_indexed	2023-09-18T22:05:24Z
last_indexed	2023-09-18T22:05:24Z
_version_	1777414674105499648

Synthesis and Photoswitching Properties of Aznzene Liquid Crystals with a Pentafluorobenzene Terminal

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