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

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

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Abstract

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.

Item Type:Article
Keyword:Liquid crystal; Non-symmeric dimmer; Nemaic phase; Bisazobenzene
Subject:Liquid crystals - Analysis
Subject:Dimers - Analysis
Subject:Dimers - Properties
Faculty or Institute:Faculty of Science
Publisher:Knowledgia Review, Malaysia
DOI Number:10.3923/crc.2010.57.63
Altmetrics:http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.3923/crc.2010.57.63
ID Code:16936
Deposited By: Najwani Amir Sariffudin
Deposited On:27 Aug 2012 09:31
Last Modified:27 Aug 2012 09:31

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