Inner- and Outer-Sphere Coordination of Acido and Neutral N,O-Donor Ligands in the Rare-Earth Metal Complexes

The data on the rare-earth metal complexes with the anionic (halides, NCS) and neutral N,O-donor ligands are systematized and generalized. The influence of the ionic radius of the complexing agent and the ligand nature (donor characteristics, steric features, nonvalent interactions) on the formation of the coordination sphere with the inner- or outer-sphere position of the ligands is monitored. The transitions of the ligands from the outer-sphere position to the first coordination sphere are considered.