Abstract
ABSTRACTIn this study, photoresponsive (PR) nanosegregated mesophases were prepared from a mixture system consisting of nonchiral bent-core (BC) and PR rod-like mesogens. The circular dichroism (CD) intensities depended strongly on the thermotropic polymorphism (nematic or smectic A) of the PR mesogen embedded in the BC molecular helical nanofilaments. The CD intensities could be reversibly modulated by alternating irradiation with UV and visible light in the nanosegregated mesophases. The study results presented interesting information relevant to the development of novel chiroptical materials.
Highlights
The intriguing chiral phenomenon in nonchiral bentcore (BC) liquid crystal (LC) phases has generated much interest since the discovery of a spontaneous chiral resolution in nonchiral BC molecular systems [1,2,3,4]
The study results presented interesting information relevant to the development of novel chiroptical materials
After decreasing the temperature from that of the Iso mixture, two transition points were checked near 41°C and 30°C, which coincided with the phase transition temperatures of the PR mesogens blended with the BC molecules
Summary
The intriguing chiral phenomenon in nonchiral bentcore (BC) liquid crystal (LC) phases has generated much interest since the discovery of a spontaneous chiral resolution in nonchiral BC molecular systems [1,2,3,4]. Mixed systems consisting of nonchiral BC and photoresponsive (PR) rod-like mesogens are promising as photomodulating chiroptical switching materials [13,14]. Jeon et al prepared another mixture system consisting of nonchiral BC and PR mesogens, which was different from the molecule system that was used by Kim et al [14] In this case, the authors reported the existence of a nanosegregated < HNF/SmA > phase. In this study, nanosegregated < HNF/N > and < HNF/SmA > phases were prepared from the same mixture system consisting of nonchiral BC and PR rodlike mesogens The use of this system allowed the direct comparison of the photomodulating chiroptic behaviors in the < HNF/N > and < HNF/SmA > phases. The study results presented interesting information relevant to the development of novel chiroptical materials
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