Solution kinetic behaviour of lanthanide (III) polyaminocarboxylates from oxygen-17 NMR studies

We review 17O NMR studies of water exchange kinetics on the lanthanide(III) ions and their complexes with a series of polyaminocarboxylate ligands. The complexes show a wide range of water exchange rates. Variable pressure measurements yield the activation volume for the water exchange process, and...

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Bibliographic Details
Published in:Journal of alloys and compounds 1995-07, Vol.225 (1), p.246-252
Main Authors: Hugh Powell, D., Favre, Michel, Graeppi, Nicole, Ni Dhubhghaill, Orla M., Pubanz, Dirk, Merbach, AndréE.
Format: Article
Language:English
Subjects:
Kinetic behaviour
Lanthanide(III)
Magnetic resonance imaging
Nuclear magnetic resonance studies
Polyaminocarboxylates
Water exchange
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Summary:We review 17O NMR studies of water exchange kinetics on the lanthanide(III) ions and their complexes with a series of polyaminocarboxylate ligands. The complexes show a wide range of water exchange rates. Variable pressure measurements yield the activation volume for the water exchange process, and allow these variations to be rationalised in terms of reaction mechanism and the accessibility of transition states of different coordination number. The results have special significance for the use of gadolinium complexes as contrast agents in medical magnetic resonance imaging, since the slow water exchange observed on these complexes will in some cases limit their proton relaxivity.
ISSN:0925-8388
1873-4669
DOI:10.1016/0925-8388(94)07115-2