Photosensitive bent-core liquid crystals with laterally substituted azobenzene unit

0548179 - FZÚ 2022 RIV CH eng J - Článek v odborném periodiku
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
Grant CEP: GA ČR GA19-03564S
Institucionální podpora: RVO:68378271
Klíčová slova: liquid crystals * photosensitivity * azobenzene unit
Obor OECD: Condensed matter physics (including formerly solid state physics, supercond.)
Impakt faktor: 2.670, rok: 2021
Způsob publikování: 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.
Trvalý link: http://hdl.handle.net/11104/0324282