Synthesis and liquid crystalline behaviour of substituted (E)-phenyl-4-(phenyldiazenyl) benzoate derivatives and their photo switching ability

Hegde, Gurumurthy and Shanker, Govindaswamy and Gan, S. M. and Yuvaraj, A. R. and Mahmood, Syed and Mandal, Uttam Kumar (2016) Synthesis and liquid crystalline behaviour of substituted (E)-phenyl-4-(phenyldiazenyl) benzoate derivatives and their photo switching ability. Liquid Crystals, 43 (11). pp. 1-11. ISSN 0267-8292 E-ISSN 1366-5855

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Abstract

Azobenzene derivatives containing phenyl/4-halogen-phenyl 4-{(E)-[4-(pent-4-en-1-yloxy)phenyl] diazenyl}benzoate group with different electronegative substituent (H, F, Cl, Br and I) at other end was synthesised. These azo-based benzoate derivatives have been characterised by FTIR, 1H-NMR, 13C-NMR, elemental analyser, POM and UV-Vis spectroscopy. Photosaturation at 358 nm obtained after 82 s of UV irradiation and the longest thermal back relaxation time of 45 h recorded by UVVis. The azo derivative could be possible photolock under UV light, as observed by the improved thermal back relaxation time. The resulting photolockable chain of azobenzene might prove valuable in the development of optical device application. These azobenzene moieties also exhibit liquid crystalline behaviour with respect to the halogen substitution as an electron withdrawing group shows that strong structure property relationship exists among them.

Item Type:	Article (Journal)
Additional Information:	6688/51064
Uncontrolled Keywords:	Photoisomerisation; azobenzene derivatives; liquid crystals; storage device; thermal back relaxation; photolock
Subjects:	R Medicine > RS Pharmacy and materia medica
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Pharmacy > Department of Pharmaceutical Technology
Depositing User:	Dr. Uttam Kumar Mandal
Date Deposited:	30 Jun 2016 11:39
Last Modified:	20 Mar 2017 15:47
URI:	http://irep.iium.edu.my/id/eprint/51064

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