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Photosensitive bent-core liquid crystals with laterally substituted azobenzene unit

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    0548179 - FZÚ 2022 RIV CH eng J - Journal Article
    Jágerová, D. - Šmahel, M. - Poryvai, A. - Macháček, J. - Novotná, Vladimíra - Kohout, M.
    Photosensitive bent-core liquid crystals with laterally substituted azobenzene unit.
    Crystals. Roč. 11, č. 10 (2021), č. článku 1265. ISSN 2073-4352. E-ISSN 2073-4352
    R&D Projects: GA ČR GA19-03564S
    Institutional support: RVO:68378271
    Keywords : liquid crystals * photosensitivity * azobenzene unit
    OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
    Impact factor: 2.670, year: 2021
    Method of publishing: Open access

    Photosensitive liquid crystals represent an important class of functional materials that experiences rapid development. Hereby, we present novel bent-core liquid crystals bearing a lateral substitution on the central core as well as in the vicinity of the photosensitive unit – an azo group. The azo group enables fast (E)-to-(Z)-isomerization upon irradiation with UV-light and visible light, while the substitution facilitates high stability of the photochemically formed (Z)-isomer. The effectiveness of the irradiation and the composition of photostationary states has been determined by UV/Vis and 1H NMR spectroscopy. A nematic phase formed by the materials was characterized by differential scanning calorimetry and optical polarizing microscopy. We show that the materials easily change their relative configuration of the N=N double bond not only in solution, but also in the mesophase, which leads to fast isothermal phase transition from the nematic phase to isotropic liquid.
    Permanent Link: http://hdl.handle.net/11104/0324282

     
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