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

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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
Download Statistic:	View Download Statistics

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