Influence of the rigidity of the steroid core in the structure of chiral dopants on the temperature dependence of cholesteric short pitch |
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| Affiliation: | 1. Department of Optically Active Organic Compounds, SSI “Institute for Single Crystals”, National Academy of Sciences of Ukraine, Kharkov, Ukraine;2. Laboratory of Synthesis of Steroids, State Institution “V.Ya. Danilevsky Institute of Endocrine Pathology Problems”, Academy of Medical Sciences of Ukraine, Kharkov, Ukraine;3. Department of Physical Organic Chemistry, Institute of Chemistry at V.N. Karazin Kharkov National University, Kharkov, Ukraine;1. Department of Civil and Materials Engineering, University of Illinois at Chicago, Chicago, IL 60607, USA;2. Institute of Nanotechnology and Physical Engineering, Berdyansk State Pedagogical University, 71100 Berdyansk, Ukraine;1. Aix-Marseille Université, CNRS, ISM UMR 7287, Marseille, France;2. Oxylane Research, Lille, France;1. The Bradley Department of Electrical and Computer Engineering, Virginia Polytechnic Institute and State University, Blacksburg, VA 24060, USA;2. Department of Physics, The American University of Cairo, P.O. Box 74, New Cairo 11835, Egypt;3. FEEC, Universidade de Cambinas, Campinas, São Paulo, Brazil |
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| Abstract: | New chiral compounds of the steroid type, namely, 3-alkanoyl- and 3-alkyl derivatives of 16-arylidene estrone, were synthesized and exhibited high helical twisting power (HTP) in nematic liquid crystals E63 and LC-1289. The peculiarities of the molecular structure of chiral compounds (CCs) and their high degree of chirality were discussed. Quite small concentrations of chiral compounds in both nematic solvents were needed to obtain a short-pitch cholesteric helical macrostructure with the selective light reflection in the visible range of the spectrum. The insignificant temperature dependence of the maximum wavelength of the selective light reflection obtained on the whole cholesteric range for all studied liquid crystalline (LC) systems could be related to relatively rigid molecular structure of the chiral compounds. The cholesteric LC mixtures comprising 3-alkanoyl- and 3-alkyl derivatives of 16-arylidene estrone were characterized by the phase stability and the stability of reflective characteristics in time that makes it possible to consider this series of dopants as appropriate for development of bistable cholesteric reflective LC displays. |
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| Keywords: | Liquid crystals Chiral dopants Helical twisting power Selective light reflection Bistable cholesteric reflective displays |
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