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 |
| ID Code: | 16936 |
| Deposited By: | Najwani Amir Sariffudin |
| Deposited On: | 27 Aug 2012 17:31 |
| Last Modified: | 27 Aug 2012 17:31 |
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