Water exchange in lanthanide complexes for MRI applications. Lessons learned over the last 25 years

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Abstract
The water exchange rates of water molecules coordinated to the metal ion in lanthanide complexes have been profusely investigated during the last 25 years, especially in the case of Gd3+ and Eu3+ complexes. This is mainly related to the important application of some Gd3+ complexes as contrast agents in magnetic resonance imaging (MRI), and the intensive investigation of Eu3+ complexes as contrast agent candidates providing contrast through the chemical exchange saturation transfer mechanism (CEST). Both applications require a fine tunning of the exchange rate of the coordinated water molecule to yield optimal response. Herein we review the progress made in this field to control water exchange in a rational way through ligand design, providing relationships between the observed trends, the structures of the complexes and the mechanisms responsible for the water exchange reaction.
Funding Information
  • Ministerio de Economía y Competitividad (CTQ2016-76756-P)
  • Ministerio de Ciencia, Innovación y Universidades (PRX18/00201)
  • National Institute of Biomedical Imaging and Bioengineering (R01EB009062)
  • National Institute of Diabetes and Digestive and Kidney Diseases (U01DK104302)
  • NIH Office of the Director (S10OD010650)
  • NIH Office of the Director (S10OD025234)
  • Consellería de Cultura, Educación e Ordenación Universitaria, Xunta de Galicia (ED431B 2017/59)
  • Consellería de Cultura, Educación e Ordenación Universitaria, Xunta de Galicia (ED431D 2017/01)
  • Fulbright Association

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