Chromogenic systems based on 8-(1,3-benzoxazol-2-yl) substituted spirobenzopyrans undergoing ion modulated photochromic rearrangements
| Autor: | Anatoly V. Metelitsa, Anatoly V. Chernyshev, I. A. Rostovtseva, E. V. Solov’eva, N. A. Voloshin, Vladimir I. Minkin, E.B. Gaeva |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
010405 organic chemistry
Chromogenic General Chemical Engineering Metal ions in aqueous solution General Physics and Astronomy General Chemistry 010402 general chemistry Photochemistry 01 natural sciences Fluorescence Photobleaching 0104 chemical sciences Ion Metal chemistry.chemical_compound Photochromism chemistry visual_art visual_art.visual_art_medium Merocyanine |
| Zdroj: | Journal of Photochemistry and Photobiology A: Chemistry. 360:174-180 |
| ISSN: | 1010-6030 |
| Popis: | 8-(1,3-Benzoxazol-2-yl) substituted spirobenzopyrans 1A appear as a chromogenic system susceptible of switching between positive and negative photochromism under complexation with metal ions. The thermal and photochemical reactions accompanying metal ion-induced transformation of spiropyrans 1A to the complexes formed by their photoinduced merocyanine isomers 1B were investigated. In the dark, the colorless spiropyrans interact with Mn 2+ , Cd 2+ and Zn 2+ transition metal ions to yield deeply colored 1:1 complexes possessing fluorescence, while Co 2+ , Ni 2+ , Cu 2+ ions prefer to form non-fluorescent complexes with two merocyanines. Under irradiation with visible light solutions of the merocyanine-metal complexes undergo photobleaching. This effect was quantified using photokinetic method. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect