Self-assembled star-shaped liquid crystals based on 1,3,5-trihydroxybenzene with pendant alkyloxylated azobenzene arms

Designing and self-assembly of unconventional star-shaped mesogens or 'hekates' are of interest to materials science and molecular electronics. This work presents the synthesis of several symmetric trimeric liquid crystalline compounds comprising 1,3,5-trihydroxybenzene (phloroglucinol) as...

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Bibliographic Details
Published in:Liquid crystals 2020-09, Vol.47 (12), p.1852-1862
Main Authors: Carlescu, Irina, Simion, Aurel, Epure, Elena Luiza, Lisa, Gabriela, Scutaru, Dan
Format: Article
Language:English
Subjects:
Azo compounds
azobenzene
Calorimetry
Chains
Chemical synthesis
Crystal structure
Crystallinity
Crystals
discotic
hekates
Light microscopy
Liquid crystals
Materials science
Mesophase
Molecular electronics
Optical microscopy
Phloroglucinol
Self-assembly
Star-shaped liquid crystals
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Summary:Designing and self-assembly of unconventional star-shaped mesogens or 'hekates' are of interest to materials science and molecular electronics. This work presents the synthesis of several symmetric trimeric liquid crystalline compounds comprising 1,3,5-trihydroxybenzene (phloroglucinol) as central core. The liquid crystalline behaviour was induced by attaching three rod-like azo-aromatic semi-flexible units to the central core via esteric linkages. Based on differential scanning calorimetry and polarising optical microscopy, the mesophase stability mainly depends on the alkyl chain length. The compounds showed monotropic or enantiotropic behaviour, except the compound with nine atoms on the chain end which is non-mesomorphic. In addition to the synthesis and mesophase characterisation, the self-assembled structures and individual properties have been characterised by molecular simulations.
ISSN:0267-8292
1366-5855
DOI:10.1080/02678292.2020.1747648