Copper(II) Simple and Mixed Complexes Containing Tridentate Ligands with O, S, Se Donor Atoms in Aqueous Solution. Spectroscopic Investigations and Thermodynamic Considerations.

Spectroscopic (epr and electronic) investigations have been carried out in solution on the simple and mixed ligand complexes of copper(II) containing oxydiacetate, thiodiacetate or selenodiacetate and 2,2′-bipyridyl or 2,2′,2 - {combining double acute accent}terpyridyl. On the ground of the data obtained it is pointed out that the slight differences present along the series of the simple complexes are suppressed in the ternary ones. Pseudooctahedral geometries are suggested for all these complexes. These results are compared with the thermodynamic parameters previously published