Synthesis and mesophase behaviour of branched azobenzene-based supramolecular hydrogen-bonded liquid crystals

Five types of new pyridine-based azo compounds, namely, 4-(4′-pyridylazo)-4′'-alkoxybenzoates or 4-(4′-pyridylazo)-4′'-substituted benzoates with straight or branch terminal were prepared as hydrogen bond (H-bond) acceptors to build mesogens. After self-assembled with different carboxylic...

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Bibliographic Details
Published in:Liquid crystals 2017-02, Vol.44 (3), p.593-602
Main Authors: He, Wan-Li, Gu, Han, Zhao, Peng, Yang, Zhou, Cao, Hui, Wang, Dong
Format: Article
Language:English
Subjects:
Azo compounds
azobenzene
Benzoates
branched
Calorimetry
Carboxylic acids
Chemical bonds
chiral
Construction standards
Crystals
Fourier transforms
Hydrogen bonding
Hydrogen bonds
Hydrogen-bonded
Infrared spectroscopy
Light microscopy
liquid crystal
Liquid crystals
Mesophase
Optical microscopy
Self-assembly
Spectrum analysis
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Summary:Five types of new pyridine-based azo compounds, namely, 4-(4′-pyridylazo)-4′'-alkoxybenzoates or 4-(4′-pyridylazo)-4′'-substituted benzoates with straight or branch terminal were prepared as hydrogen bond (H-bond) acceptors to build mesogens. After self-assembled with different carboxylic acids, the resulted H-bond complexes were confirmed for the stability of H bond by fourier transform infrared spectroscopy (FTIR) spectroscopy, and investigated for the mesophase behaviour by differential scanning calorimetry and polarised optical microscopy. The influence of terminal chains in azo accepter or acid donor and the structure of acid donors on the mesogenic behaviour were discussed in detail.
ISSN:0267-8292
1366-5855
DOI:10.1080/02678292.2017.1306635