Synthesis and thermal properties of rigid oxa-bridged-containing dimers and tetramers

Khan, Faiz Ahmed ; Parasuraman, Karuppasamy ; Donnio, Bertrand (2010) Synthesis and thermal properties of rigid oxa-bridged-containing dimers and tetramers Tetrahedron, 66 (45). pp. 8745-8755. ISSN 0040-4020

Full text not available from this repository.

Official URL: http://www.sciencedirect.com/science/article/pii/S...

Related URL: http://dx.doi.org/10.1016/j.tet.2010.09.003

Abstract

Several symmetrical, linear dimers and some star-like tetramers were prepared using easily accessible oxa-bridged derivatives as central rigid cores. In order to produce new liquid crystalline materials various mesogenic/promesogenic groups, containing biphenyl-4,4'-diol, 4,4'-(diazene-1,2-diyl)diphenol and cholesterol sub-moieties, were connected through oxy-ethylene linkers via an ester linkage, in the end-on fashion. Their thermal behaviour and mesomorphic properties were investigated by differential scanning calorimetry (DSC), polarized optical microscope (POM), and variable temperature small-angle X-ray diffraction (XRD) methods. While essentially all the biphenyl-4,4'-diol- and 4,4'-(diazene-1,2-diyl)-based dimeric derivatives exhibited smectic liquid crystalline mesophases, the nature of which are mesogenic groups dependent, none of the cholesterol-containing compounds and tetramers were mesomorphic.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
ID Code:80331
Deposited On:31 Jan 2012 14:30
Last Modified:31 Jan 2012 14:30

Repository Staff Only: item control page