Photosensitive chiral self-assembling materials: significant effects of small lateral substituents

Novel azobenzene-based photosensitive mesogens with lactate chiral units were synthesized. In order to modify the rate of the thermal Z-E isomerization of these compounds, small lateral substituents were introduced into their core in the proximity of the azo group. The influence of lateral substitut...

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Bibliographic Details
Published in:Journal of materials chemistry. C, Materials for optical and electronic devices Materials for optical and electronic devices, 2016-01, Vol.4 (23), p.5326-5333
Main Authors: Cigl, Martin, Bubnov, Alexej, Kašpar, Miroslav, Hampl, František, Hamplová, V ra, Pacherová, Oliva, Svoboda, Ji í
Format: Article
Language:English
Subjects:
Azo
Data storage
Isomerization
Lactates
Molecular structure
Photosensitivity
Proximity
Stability
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Summary:Novel azobenzene-based photosensitive mesogens with lactate chiral units were synthesized. In order to modify the rate of the thermal Z-E isomerization of these compounds, small lateral substituents were introduced into their core in the proximity of the azo group. The influence of lateral substitution on the kinetics of the Z-E isomerization, mesomorphic behaviour, and UV-Vis absorption spectra was studied. It was found that the position of the substituents in the azobenzene core significantly affects the rate of their thermal isomerization. The stability of Z -isomers of several studied compounds is comparable to that of compounds with complex molecular structures designed for optical data storage. Although lateral substitution influences the breadth/length ratio of the core, liquid-crystalline properties of the studied materials have been preserved. Substituent effects are correlated with thermal Z - E isomerization as a crucial factor for applications in azo-based materials.
ISSN:2050-7526
2050-7534
DOI:10.1039/c6tc01103a