Abstract
It was shown by electronic spectroscopy that the visible absorption spectrum of the polynuclear Cu(II)–Gd(III) metallamacrocyclic complex is pH-sensitive. The intensity of the absorption peak at 577 nm decreases 5-fold as the pH decreases from 6.8 to 3.3 and restores the initial level as the pH increases up to 12.4. On the basis of DFT calculations and analysis of topological electron density characteristics, the spectral changes were attributed to protonation of the glycinehydroximate ligand.
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ACKNOWLEDGMENTS
The measurements were performed using the equipment of the Center for Collective Use Analytical Center of the IOMC RAS.
Funding
The studies of electron density and spectral properties of the complexes were supported by the Russian Science Foundation (project no. 18-13-00356). G.Yu. Zhigulin is grateful to the support from the Russian Foundation for Basic Research (project no. 18-33-01252 mol_a).
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Translated by Z. Svitanko
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Zhigulin, G.Y., Zabrodina, G.S., Katkova, M.A. et al. Polynuclear Glycinehydroximate Cu(II)–Gd(III) Metallamacrocyclic Complexes: Halochromic Properties. Russ J Coord Chem 45, 356–360 (2019). https://doi.org/10.1134/S107032841905004X
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DOI: https://doi.org/10.1134/S107032841905004X