Electro-optic and molecular relaxation behaviour of fluoro substituted achiral unsymmetrical four-ring bent-core mesogen

Electro-optic and molecular relaxation studies in a new achiral unsymmetrical four-ring bent-core mesogen are presented in this study. The compound consists of a laterally fluoro-substituted 3,4′-disubstituted biphenyl unit with an ester linkage between the two phenyl rings as the central unit. The...

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Bibliographic Details
Published in:Liquid crystals 2014-05, Vol.41 (5), p.635-641
Main Authors: Paul, Manoj Kr, Kumar, Rishi, Chakraborty, N., Raina, K.K., Rao, Nandiraju V.S.
Format: Article
Language:English
Subjects:
bent-core mesogens
Differential scanning calorimetry
Electric fields
electro-optical studies
Electro-optics
Esters
Liquid crystal polymers
memory effect
Molecular relaxation
Permittivity
Phase transitions
relaxation phenomenon
Surface layer
Switching
Temperature effects
Texture
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Summary:Electro-optic and molecular relaxation studies in a new achiral unsymmetrical four-ring bent-core mesogen are presented in this study. The compound consists of a laterally fluoro-substituted 3,4′-disubstituted biphenyl unit with an ester linkage between the two phenyl rings as the central unit. The mesomorphic properties were characterised by polarising optical microscopy and differential scanning calorimetry. The compound exhibited enantiotropic B 7 -B x  phase sequence. The electro-optic studies revealed a bistable switching from planar to a homeotropic state under an electric field in B 7  phase. Further memory effect was observed between planar and homeotropic textures after the removal of electric field in B 7  phase. Temperature dependent permittivity studies as a function of frequency revealed that the molecular relaxation increases with the increasing temperature in B 7  phase than in B x  phase.
ISSN:0267-8292
1366-5855
DOI:10.1080/02678292.2013.871078