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New azobenzene-based chiral-photochromic substances with thermally stable Z-isomers and their use for the induction of a cholesteric mesophase with a phototunable helix pitch
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SYSNO ASEP 0435954 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title New azobenzene-based chiral-photochromic substances with thermally stable Z-isomers and their use for the induction of a cholesteric mesophase with a phototunable helix pitch Author(s) Bobrovsky, A. (RU)
Ryabchun, A. (RU)
Cigl, Martin (FZU-D) RID, ORCID
Hamplová, Věra (FZU-D) RID, ORCID, SAI
Kašpar, Miroslav (FZU-D) RID
Hampl, F. (CZ)
Shibaev, V. (RU)Source Title Journal of Materials Chemistry C. - : Royal Society of Chemistry - ISSN 2050-7526
Roč. 26, č. 40 (2014), s. 8622-8629Number of pages 8 s. Language eng - English Country GB - United Kingdom Keywords photosensitive ; liquid crystal ; azo ; selective reflection Subject RIV JI - Composite Materials R&D Projects GA13-14133S GA ČR - Czech Science Foundation (CSF) GAP204/11/0723 GA ČR - Czech Science Foundation (CSF) Institutional support FZU-D - RVO:68378271 UT WOS 000342994600021 EID SCOPUS 84907495432 DOI 10.1039/c4tc01167h Annotation Novel photosensitive azobenzene-containing substances with sorbitol- and lactate-based chiral fragments were synthesized to serve as chiral-photochromic dopants in cholesteric mixtures. Owing to the presence of chlorine or methyl lateral substituents in the azobenzene fragment of the dopants, the photoinduced Z-form of their molecules is highly stable. The photooptical properties of the prepared cholesteric mixtures were studied and it was shown that UV-irradiation of the planarly-oriented films results in a shift of the selective light reflection wavelength to a long-wavelength spectral region due to E–Z isomerization of the azobenzene moieties. It was found that this value is almost two orders of magnitude less in comparison with the non-substituted chiral-photochromic dopant also studied in this work. The obtained results demonstrate the promising properties of the synthesized compounds for creation of novel photoswitchable cholesteric materials. Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2015
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