An unexpectedly slow exchange rate has been observed for the coordinated water molecule of [Yb(AAZTA)(H2O)]− using 1H-NMR and CEST-MRI studies. This made it possible for the first time to exploit the bound water molecule of a LnIII complex with carboxylic donor groups for CEST imaging. This result envisages the development of a new family of thermodynamically stable ParaCEST probes based on anionic chelates.
![Graphical abstract: [Yb(AAZTA)(H2O)]−: an unconventional ParaCEST MRI probe](/en/Image/Get?imageInfo.ImageType=GA&imageInfo.ImageIdentifier.ManuscriptID=C8CC00193F&imageInfo.ImageIdentifier.Year=2018)
D. Delli Castelli, L. Tei, F. Carniato, S. Aime and M. Botta, Chem. Commun., 2018, 54, 2004 DOI: 10.1039/C8CC00193F
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