Photo-optical properties of amorphous and crystalline films of  azobenzene-containing photochromes with bent-shaped molecular  structure

Bobrovsky, A.; Novotná, V.; Shibaev, V.; Kašpar, M.; Hamplová, V.; Piryazev, A.; Bubnov, A.; Anokhin, D.; Ivanov, D.

Авторы: Alexey Bobrovsky, Vladimíra Novotná, Valery Shibaev, Miroslav Kašpar, Vera Hamplová, Alexey Piryazev, Alexej Bubnov, Denis Anokhin, Dimitri Ivanov
Журнал: Journal of Photochemistry and Photobiology A: Chemistry
Том: 316
Год издания: 2016
Издательство: Elsevier BV
Местоположение издательства: Netherlands
Первая страница: 75
Последняя страница: 87
DOI: 10.1016/j.jphotochem.2015.10.021
Аннотация: A comparative study of the photo-optical properties and the photo-orientation processes in thin films of the bent-shaped azobenzene-containing compounds with different molecular structure was performed. For this purpose three new compounds were designed and prepared: two of these compounds with a symmetric bent-shaped molecular structure incorporate two azobenzene chromophores with different length of alkyl chains (6 and 8 methylene units), the third bent-shaped compound possesses only one azobenzene fragment. The effect of molecular and supramolecular structure, thermal prehistory of the films, wavelengths of the excitation light on the photo-optical properties, photoorientation processes and films morphology was revealed. It was shown that UV-irradiation leads to E–Z isomerization of azobenzene fragments in both amorphousized and crystalline films of the synthesized substances. This process is partially suppressed in crystalline films, but, nevertheless, UV-irradiation of the bichromophoric compounds results in transition from crystalline to amorphous state and decrease in the surface roughness. Irradiation of amorphousized films with polarized visible and UV-light induces the photoorientation of chromophores in direction perpendicular to the polarization plane of the incident light. Relatively high values of photoinduced dichroism in the bent-shaped compounds(D 0.60–0.65) are comparable with other azobenzene-containing rod-shaped systems. Photoinduced isothermal melting and photoorientation processes could be served for the photo-optical data recording and storage.
Добавил в систему: Иванов Дмитрий Анатольевич

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Photo-optical properties of amorphous and crystalline films of azobenzene-containing photochromes with bent-shaped molecular structureстатья

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