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https://doi.org/10.37358/Rev.Chim.1949

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Revista de Chimie (Rev. Chim.), Year 2016, Volume 67, Issue 3,



Aurel Simion, Irina Carlescu, Gabriela Lisa, Dan Scutaru

Unsymmetrical Bent-core Liquid Crystals Based on Resorcinol Core

Abstract:

Two series of unsymmetrical bent-core liquid crystals were obtained by using resorcinol as central core. The two classes of compounds were obtained by reacting 3-(benzyloxy)phenol with some 4-(4-alkyloxyphenylazo)benzoic acids and 4-((4-(alkyloxy)benzoyl)oxy)benzoic acids both possessing six to ten carbon atoms in the flexible tail. The chemical structure was confirmed by spectroscopic techniques (1H-NMR, 13C-NMR, FTIR and MS) while the mesomorphic properties were investigated by differential scanning calorimetry (DSC) and polarized optical microscopy (POM). The series containing an azo aromatic moiety as linking group presented liquid crystalline properties only in the cooling cycle while the other series, where an esteric group was introduced an enantiotropic behaviour for compounds possessing an even number of carbon atoms in the flexible terminal chain. All the investigated compounds proved to be thermally stable up to 3000C.

Keywords:
bent-core; liquid crystals; resorcinol; azo linking group

Issue: 2016, Volume 67, Issue 3
Pages:
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