Nature of the Magnetic Interaction in the (Cu2+, Ln3+) Pairs: An Empirical Approach Based on the Comparison Between Homologous (Cu2+, Ln3+) and (NiLS2+, Ln3+) Complexes

The magnetic interaction in a series of isomorphous Cu2+–Ln3+ complexes (1) is antiferromagnetic for LnCe, Nd, Sm, Tm, Yb and ferromagnetic for Ln=Gd, Tb, Dy, Ho, Er, while no interaction is operative for Ln=La, Pr, Eu, Lu.