Hockey stick-shaped azo compounds: effect of linkage groups and their direction of linking on mesomorphic properties

Several new hockey stick-shaped azo compounds are designed and synthesised with an aim to study the effect of different types of linkages and their direction of linking on the mesomorphic properties in such systems. The new compounds synthesised are characterised by spectroscopic methods. The liquid...

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Bibliographic Details
Published in:Liquid crystals 2015-10, Vol.42 (10), p.1490-1505
Main Authors: Monika, M., Prasad, Veena, Nagaveni, N.G.
Format: Article
Language:English
Subjects:
anticlinic smectic C
azo compound
Azo compounds
Chemical synthesis
Differential scanning calorimetry
Diffraction
Hockey
hockey stick shape
Joining
Linkages
Linking
Liquid crystal polymers
Liquid crystals
Microscopy
nematic
Optical microscopy
photo-switching
smectic A
Spectrum analysis
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Summary:Several new hockey stick-shaped azo compounds are designed and synthesised with an aim to study the effect of different types of linkages and their direction of linking on the mesomorphic properties in such systems. The new compounds synthesised are characterised by spectroscopic methods. The liquid crystalline properties are investigated using polarizing optical microscopy (POM), differential scanning calorimetry (DSC) and X-ray diffraction (XRD) studies. They exhibited a variety of mesophases such as nematic (N), smectic A (SmA), anticlinic smectic C (SmC a ), B 1 , etc. We found that the direction of linkage groups has a major effect on the mesomorphic properties when compared to the effect of different types of linkage groups. We observed a reversible photo-switching phenomenon of these compounds in their solution UV-vis spectra.
ISSN:0267-8292
1366-5855
DOI:10.1080/02678292.2015.1066889