Synthesis and mesomorphic properties of non-symmetric liquid crystalline dimers containing azobenzene groups

Rahman, Md Lutfor and Asik, Jahimin and Kumar, Sandeep and Silong, Sidik and Ab. Rahman, Mohamad Zaki (2009) Synthesis and mesomorphic properties of non-symmetric liquid crystalline dimers containing azobenzene groups. Phase Transitions: A Multinational Journal, 82 (3). pp. 228-239. ISSN 0141–1594

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Abstract

Four novel nonsymmetric dimers containing azobenzene mesogenic groups were synthesized. The nonsymmetric dimers compounds namely, ethyl 4-[(4-{4-(4-((4-nitrophenyl)diazenyl)phenoxy)alkyloxy}phenyl)diazenyl]benzoate were obtained from the alkylation of ethyl 4-[(4-(4-bromoalkyloxy)phenyl)diazenyl]benzoate with 4-[(4-nitrophenyl)diazenyl]phenol. The mesomorphic properties of the compounds were determined by DSC and polarizing optical microscopy. The first member of the series was nonliquid crystalline while all other homologues display nematic and smectic A phases. The trans-azobenzene groups of the dimers display a high-intensity –* transition at about 365nm and a low-intensity n–* transition at around 465 nm, therefore, photochromism can be achieved by the introduction of the azo linkage to the dimeric liquid crystalline molecules.

Item Type:Article
Keyword:Mesophase; Azobenzene; Nonsymmetric dimmers; Cis–trans isomers; Nematic; Smectic
Subject:Dimers - Analysis
Subject:Dimers - Properties
Subject:Azo compounds
Faculty or Institute:Faculty of Science
Publisher:Taylor & Francis
DOI Number:10.1080/01411590802642406
ID Code:16941
Deposited By: Najwani Amir Sariffudin
Deposited On:27 Aug 2012 09:09
Last Modified:27 Aug 2012 09:09

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