Synthesis and characterization of two series of non-symmetric liquid crystal dimer containing bisazobenzene moiety
Salisu, Abdulsalam Abubakar, Ab. Rahman, Mohamad Zaki, Silong, Sidik, 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.
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