Affiliation:
1. Faculty of Chemical Engineering and Environmental Protection, Gheorghe Asachi Technical University of Iasi, Iasi, Romania
Abstract
The paper presents the synthesis and mesomorphic behavior of two new series
of bent core liquid crystalline compounds based on a 1,3-dihydroxybezene core
and containing a cholesteryl 6-oxyhexanoate wing. The two series were
obtained by the esterification of the cholesteryl
6-(3-hydroxyphenoxy)hexanoate core with some
4-((4-(n-alkyloxy)phenyl)azo)benzoic acids (n-alkyl = n-hexyl ? n-dodecyl) or
4-(4-(n-alkyloxy)benzoyloxy)benzoic acids (n-alkyl = n-hexyl ? n-decyl). The
esterification reactions were performed via the corresponding acyl chlorides
or with the DCC / DMAP system. All the synthesized compounds evidenced
enantiotropic liquid crystalline properties, with smectic type textures, when
investigated by means of differential scanning calorimetry and polarized
optical microscopy. Isotropisation and isotropic to liquid crystal
transitions were relatively low (between 89 ? 1460C). The compounds
containing the azo-aromatic linking group presented the largest range of
stability of the mesophases (between 42 and 870C). All the investigated
compounds were thermally stable in the existence range of the mesophases.
Publisher
National Library of Serbia
Cited by
10 articles.
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