Etude par RMN. de polyaminocarboxylates de terres rares,II. Nitrilotriacétates de scandium,yttrium, lanthane et lutécium |
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Authors: | A Merbach F Gnaegi |
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Abstract: | Proton nuclear magnetic resonance has been used to study the chemistry of the diamagnetic nitrilotriacetate complexes of scandium, yttrium, lanthanum and lutecium in aqueous solution. Complexes with ligand-to-metal ratios of 1 and 2 are present depending of the solution conditions. The ligand exchanges by spontaneous and by acid catalysed dissociation of the metal-bis-nitrilotriacetate, and also by a bimolecular process involving the free ligand and the complex. The ligand exchange rate constants decrease with the ionic radii:lanthanum > yttrium > lutecium > scandium. |
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