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Synthesis and characterization of two series of non-symmetric liquid crystal dimer containing bisazobenzene moiety


Citation

Salisu, Abdulsalam Abubakar and Ab. Rahman, Mohamad Zaki and Silong, Sidik and Lutfor, Md Rahman and Ahmad, Mansor (2009) Synthesis and characterization of two series of non-symmetric liquid crystal dimer containing bisazobenzene moiety. Current Research in Chemistry, 1 (1). pp. 15-21. ISSN 1996-5052

Abstract / Synopsis

Two series of calamitic non-symmetric liquid crystalline dimer compound containing bisazobenzene moiety and a rather short alkoxybiphenyl linked by flexible spacers 4-propyloxy-[4-biphenyloxyalkyl]-4`-(4-phenylazo)azobenzene has been synthesized and characterized by spectroscopic methods. The transition temperatures and phase behaviours were studied by Differential Scanning Calorimetry (DSC), Polarizing Optical Microscopy (POM) and X-Ray Diffraction (XRD) study. The synthesized compounds exhibited enantiotropic liquid crystal phase with dimer (D1) containing pentyl flexible alkyl spacer showing smectic A and smectic C phases and dimer (D2) with hexyl spacer exhibitig SmA and nemetic phases respectively and the stability of the smectic layer depends on the spacer length for the compounds studied.


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Additional Metadata

Item Type: Article
Subject: Liquid crystals - Analysis
Subject: Dimers - Analysis
Subject: Dimers - Properties
Divisions: Faculty of Science
DOI Number: 10.3923/crc.2010.57.63
Publisher: Knowledgia Review, Malaysia
Keywords: Liquid crystal; Non-symmeric dimmer; Nemaic phase; Bisazobenzene
Depositing User: Najwani Amir Sariffudin
Date Deposited: 27 Aug 2012 17:31
Last Modified: 27 Aug 2012 17:31
Altmetrics: http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.3923/crc.2010.57.63
URI: http://psasir.upm.edu.my/id/eprint/16936
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