Synthesis and Characterization of Naphthalene-Based Banana- Shaped Liquid Crystals for Photoswitching Properties

Hegde, Gurumurthy and Lutfor, M. R. and M. M., Yusoff and Muhammad Nor Fazli, Abd Malek and Nurlin, Abu Samah and Srinivasa, H. T. and Kumar, Sandeep (2014) Synthesis and Characterization of Naphthalene-Based Banana- Shaped Liquid Crystals for Photoswitching Properties. Journal of the Chinese Chemical Society, 61 (5). pp. 571-577. ISSN 0009-4536 (print); 2192-6549 (online). (Published)

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DOI/Official URL: http://dx.doi.org/10.1002/jccs.201300191

Abstract

A series of banana-shaped monomers containing naphthalene as central units, azobenzene in side arms with terminal alkenes were synthesized and characterized. Polarizing optical microscopy, DSC and X-ray diffraction measurements reveal that one compound processes a nematic phase while other four compounds exhibit B6 phase. The absorption spectrum of trans-azobenzene displays high-intensity -* transition at 365 and low-intensity n-* transition at 450 nm. These molecules exhibit strong photoisomerisation behaviour in solutions in which trans to cis isomerisation takes 55 seconds whereas reverse process takes about 32 hours. Such a long thermal back relaxation is useful for creation of optical image storage devices.

Item Type:	Article
Additional Information:	Indexes in Scopus and WOS. IF: 0.879
Uncontrolled Keywords:	Naphthalene; Azobenzene; Isomerisation; Photoswitching; Optical image storage
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 May 2014 02:48
Last Modified:	31 Jan 2018 01:37
URI:	http://umpir.ump.edu.my/id/eprint/5470
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