Abstract
The structures of EDTA complexes of transition-metal ions in aqueous solution have been investigated by n.m.r. It is shown that whereas complexes with Fe3+ and Mn2+ possess a single water molecule in their coordination spheres, the coordination number of water in complexes of Co2+, Ni2+ and Cu2+ are 0.19, 0.33 and 0.38, respectively. These are interpreted in terms of a dynamic equilibrium between two complexes, one containing hexa-coordinate EDTA and the other penta-coordinate EDTA. It appears that the predominant solution structures adopted by these complexes are similar to those determined for the crystals. Although the coordinated water becomes replaced by a hydroxyl group for the EDTA complex of Fe3+ above pH 7, this did not occur for complexes of divalent ions below pH 10.
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Schedule a callMore From: Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases
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