Stepwise photoinduced transformation of fused aziridines via stable biradicals and azomethine ylides

Some fused aziridines are highly sensitive photochromes due to the presence of sterically strained three-membered ring. The study of photoinduced transformations of several such compounds in solutions, crystalline state, and polymeric and liquid crystal matrices using UV-vis and ESR spectrometry in...

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Bibliographic Details
Published in:Journal of photochemistry and photobiology. A, Chemistry. Chemistry., 2018-02, Vol.353, p.469-476
Main Authors: Zbruyev, Alexander I., Shishkin, Oleg V., Doroshenko, Andrey O., Desenko, Sergey M., Chebanov, Valentin A.
Format: Article
Language:English
Subjects:
Crystal structure
Crystallinity
Crystals
Liquid crystals
Photochromes
Photochromism
Quantum chemistry
Spectrometry
Spectrum analysis
Ultraviolet radiation
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Summary:Some fused aziridines are highly sensitive photochromes due to the presence of sterically strained three-membered ring. The study of photoinduced transformations of several such compounds in solutions, crystalline state, and polymeric and liquid crystal matrices using UV-vis and ESR spectrometry in combination with quantum chemical calculations revealed stepwise character of the transformations. The first deep-colored product was proven to be a new type of stable triplet biradical species while the second one was poor-colored azomethine ylide which had been previously considered as the species responsible for photochromism in crystalline state.
ISSN:1010-6030
1873-2666
DOI:10.1016/j.jphotochem.2017.11.053