Abstract
A comparative spectral study of the complex formation of molecules of nitro-substituted indoline spiropyrans with metal ions in acetonitrile and water–acetonitrile solutions, and also in acid-containing acetonitrile, was carried out. It was shown that metal complexes are not formed in the presence of water, due to protonation of photochromic spiropyran molecules. Spectral and photochromic properties of the protonated complexes obtained in the presence of water differ from those of protonated complexes arising upon interaction with an acid. A photochromic method for detecting metal ions in aqueous solutions was proposed.
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ACKNOWLEDGMENTS
The authors are grateful to A.R. Tuktarov for providing a sample of 1′-(2-hydroxyethyl)-3′,3′-dimethylspiro[2H-1-benzopyran-2,2′-indoline].
Funding
This work was carried out with the support of the Ministry of science and higher education in the framework of the work on the state order to the Federal research center “Crystallography and photonics” of the Russian academy of sciences.
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Translated from Zhurnal Obshchei Khimii, 2021, Vol. 91, No. 8, pp. 1253–1260 https://doi.org/10.31857/S0044460X21080138.
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Venidiktova, О.V., Valova, Т.М., Gorelik, А.М. et al. Spectral Study of the Effect of Water on the Complex Formation of Photochromic Spiropyrans with Metal Ions in Acetonitrile. Russ J Gen Chem 91, 1519–1525 (2021). https://doi.org/10.1134/S1070363221080132
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DOI: https://doi.org/10.1134/S1070363221080132