Photochromic spiropyran-based liquid crystals

0556038 - FZÚ 2023 RIV NL eng J - Journal Article
Malinčík, J. - Kohout, M. - Svoboda, J. - Stulov, Sergey - Pociecha, D. - Böhmová, Zuzana - Novotná, Vladimíra
Photochromic spiropyran-based liquid crystals.
Journal of Molecular Liquids. Roč. 346, Jan. (2022), č. článku 117842. ISSN 0167-7322. E-ISSN 1873-3166
R&D Projects: GA ČR GA19-03564S; GA MŠMT(CZ) EF16_019/0000760; GA MŠMT LTC19051
Grant - others:OP VVV - SOLID21(XE) CZ.02.1.01/0.0/0.0/16_019/0000760
Institutional support: RVO:68378271
Keywords : spiropyran liquid crystals * photochromic switch * polymorphism * light-induced phase transition * liquid crystal
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 6, year: 2022
Method of publishing: Limited access
https://doi.org/10.1016/j.molliq.2021.117842

We present a new type of light responsive self-assembling structures based on a spiropyran photoswitchable unit. The spiropyran central part was modified by functional groups, which enabled the connection of two structurally different elongating parts. Two series of compounds were prepared with reversed orientation of the ester as a linkage group in the molecular core. The properties of the target materials were studied by differential scanning calorimetry and polarizied light optical microscopy, which proved the presence of a nematic phase for most of the materials. In case of a trifluromethyl-substituted compound, a sequence of nematic - smectic A - smectic C phase was detected and confirmed by X-ray diffraction analysis.
Permanent Link: http://hdl.handle.net/11104/0330414