Abstract
Complexation in the Co(II)-phosphonomethylaminosuccinic acid (H4L) system in aqueous solutions at component ratios of 1 : 1 and 1 : 2 and c Co(II) = 1 × 10−2 mol/L was studied by electronic absorption spectroscopy. The formation of various protonated complexes of the general formula Co(H n L) m (OH) q (n = 3−0; m = 1–2; q = 0–2) was found, and their stability constants and distribution diagrams were calculated. It was demonstrated that the bis complexes have the structure of a distorted octahedron, and the octahedron → tetrahedron rearrangement of the coordination polyhedron occurs in the equimolar complexes at pH > 8.
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Original Russian Text © S.V. Volkov, E.K. Trunova, A.V. Shovkovaya, A.O. Gudima, 2012, published in Zhurnal Neorganicheskoi Khimii, 2012, Vol. 57, No. 11, pp. 1603–1607.
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Volkov, S.V., Trunova, E.K., Shovkovaya, A.V. et al. Complexation of Co(II) with phosphonomethylaminosuccinic acid in solutions. Russ. J. Inorg. Chem. 57, 1508–1512 (2012). https://doi.org/10.1134/S0036023612110150
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DOI: https://doi.org/10.1134/S0036023612110150