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High Pressure Research
An International Journal
Volume 13, 1994 - Issue 1-3
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H - Spectroscopy at High Pressure

High-pressure NMR study of water exchange on magnetic resonance imaging contrast agents

Lothar Helm Institut de Chimie Mintrale et Analytique, Université de Lausanne Place du Château 3, CH-1005, Lausanne, Switzerland
,
D. Hugh Powell Institut de Chimie Mintrale et Analytique, Université de Lausanne Place du Château 3, CH-1005, Lausanne, Switzerland
,
Andre E. Merbach Institut de Chimie Mintrale et Analytique, Université de Lausanne Place du Château 3, CH-1005, Lausanne, Switzerland
,
Karoly Micskei Institut of Inorganic Chemistry, Kossuth University, Debrecen, Hungary
&
Ernö Brücher Institut of Inorganic Chemistry, Kossuth University, Debrecen, Hungary
Pages 109-113 | Published online: 19 Aug 2006
 
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Abstract

The knowledge of water exchange reaction mechanism in aqueous solutions of Gd3+ polyaminocarboxylates is important for the understanding of the relatively slow water exchange rates measured for these complexes. Variable ressure measurements show a change of mechanism from associatively activated on [Gd(H2O)8]3+ and [Gd(PDTA)(H2O2)2]− to probably limiting dissociative on the MRI contrast agents [Gd(DOTA)(H2O)]−, [Gd(DTPA)(H2O)]2− and [Gd(DTPA-BMA)(H2O)].

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