UMP Institutional Repository

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

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)

[img]
Preview
PDF
Synthesis and photoswitching properties of azobenzene liquid crystals with a pentafluorobenzene terminal.pdf - Published Version

Download (807kB) | Preview

Abstract

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.

Item Type: Article
Additional Information: Indexes in Scopus
Uncontrolled Keywords: Liquid crystals; Azobenzene; Photoswitching; Fluorine compounds
Subjects: Q Science > Q Science (General)
Faculty/Division: Faculty of Industrial Sciences And Technology
Depositing User: Mrs. Neng Sury Sulaiman
Date Deposited: 18 Jan 2016 06:46
Last Modified: 06 Feb 2018 07:58
URI: http://umpir.ump.edu.my/id/eprint/9539
Download Statistic: View Download Statistics

Actions (login required)

View Item View Item