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

Full text not available from this repository.

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

Repository Staff Only: Edit item detail


Universiti Putra Malaysia Institutional Repository

Universiti Putra Malaysia Institutional Repository is an on-line digital archive that serves as a central collection and storage of scientific information and research at the Universiti Putra Malaysia.

Currently, the collections deposited in the IR consists of Master and PhD theses, Master and PhD Project Report, Journal Articles, Journal Bulletins, Conference Papers, UPM News, Newspaper Cuttings, Patents and Inaugural Lectures.

As the policy of the university does not permit users to view thesis in full text, access is only given to the first 24 pages only.