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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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.
|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|
|Deposited By:||Najwani Amir Sariffudin|
|Deposited On:||27 Aug 2012 09:31|
|Last Modified:||27 Aug 2012 09:31|
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