Synthesis and characterization of ethyl cellulose-based liquid crystals containing azobenzene chromophores

M. Lizu, and Rahman, Md Lutfor and Loumi @ Noumie Surugau, and How, Siew Eng and Sazmal Effendi Arshad, (2010) Synthesis and characterization of ethyl cellulose-based liquid crystals containing azobenzene chromophores. Molecular Crystals and Liquid Crystals, 528 . pp. 64-73. ISSN 1542-1406

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Official URL: http://dx.doi.org/10.1080/15421406.2010.504516

Abstract

Two compounds based on the ethyl cellulose having azobenzene side chain mesogenic units were prepared and the structures of the cellulosic liquid crystals were confirmed by Fourier transform infrared (FTIR) and nuclear magnetic resonance (NMR) spectra. Liquid-crystalline properties were characterized by differential scanning calorimetry and polarizing optical microscopy in which compound 4a shows a columnar phase and compound 4b shows a semectic A phase. The absorption spectra of the azobenzene units display a high-intensity π-π* transition at about 364 and 366nm for compounds 4a and 4b, respectively, and a lower intensity πn-π* transition at around 468nm for both compounds. Hence, photochromism can be achieved by the introduction of the azo linkage to ethyl cellulose containing liquid crystals. Copyright © Taylor & Francis Group, LLC.

Item Type:Article
Uncontrolled Keywords:Azo chromophores, Ethyl cellulose (EC), liquid crystals, photochromism
Subjects:Q Science > QD Chemistry
Divisions:SCHOOL > School of Science and Technology
ID Code:2123
Deposited By:IR Admin
Deposited On:08 Mar 2011 18:52
Last Modified:23 Feb 2015 15:38

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