Complexation of Co(II) with phosphonomethylaminosuccinic acid in solutions |
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Authors: | S V Volkov E K Trunova A V Shovkovaya A O Gudima |
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Institution: | 1. Vernadsky Institute of General and Inorganic Chemistry, National Academy of Sciences of Ukraine, pr. akademika Palladina 32/34, Kiev, 252142, Ukraine
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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?C2; q = 0?C2) 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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