M. Melnik et M. Kabesova, Copper(III) coordination compounds: Classification and analysis of crystallographic and structural data, J COORD CH, 50(3-4), 2000, pp. 323-338
Copper is classed as a transition metal both from its physico-chemical prop
erties and its biochemical behavior. This review includes thirty formally c
opper(III) compounds where crystal structure has been determined. Coordinat
ion number four dominates with mostly a square-planar arrangement about the
copper(III) atom. Sulfur donor ligands by far prevail. In general the Cu-L
bond distance elongated with a decreased oxidation state of copper in the
sequence: Cu(III)-L < Cu(II)-L < Cu(I)-L. Examples of distortion isomerism
exist.