Structure and stability of carboxylate complexes. XIX. The structures of diamminebis(glycolato)copper(II), tetraamminebis(ethoxyacetato)copper(II), bis(glycolato)bis(pyridine)copper(II) and bis(ethoxyacetato)bis(pyridine)copper(II)

The copper(II) ion is in an elogated tetragonally distorted octahedral environment in all four compounds. The ethoxyacetate ligand is unidentate in the tetraammine compound, but the hydroxy- and alkoxycarboxylate ligands from trans-planar five-membered chelate rings in the other three compounds. Cooperative variations in the dimensions of the copper(II) coordination sphere may be ascribed to the different σ donors powers of the ligand