Abstract
Electronic spectroscopy and structural-geometric analysis have been used in studying ionic interactions in aqueous solutions of Co(NO3)2, CoSO4, CoCl2, and NiSO4. The processes influencing the structural environment of the cations in solution and the character of the electronic spectra of Co(II) and Ni(II) have been distinguished: replacement of ligands in the first coordination sphere of the transition-metal ion, change in mobility of the particles in the medium, and change in the structural matrix on the solution upon going from one concentration region to another. A small change in the structure of bulk water in the solutions of these salts has been demonstrated. For Co(NO3)2 solutions, the limit of existence of a water-like structure of the solution has been defined.
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