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Updated: May 29, 2026

Preparation, Purification, and Characterization of Lanthanide Complexes for Use as Contrast Agents for Magnetic Resonance Imaging
Published on: July 21, 2011
Coordinating ability of anions and solvents towards transition metals and lanthanides
Raúl Díaz-Torres1, Santiago Alvarez
1Departament de Química Inorgànica and Institut de Química Teòrica i Computacional, Universitat de Barcelona, Martí i Franquès 1-11, 08028, Barcelona, Spain.
Abstract:
A scale that attempts to quantify the weakly coordinating character of a variety of solvents and anions is presented. For each group (solvent or anion), a coordinating ability index has been calculated, based on the probability of it being coordinated in the presence of a transition metal atom, compared to the probability of finding it as a solvation molecule or as non-coordinating counterion in a crystal structure. The corresponding index is also defined for the same groups in the presence of lanthanides, and the similarities and differences are discussed.
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