ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Mutually related effect of ligands in copper(II) complexes

J. Gažo

Slovak Technical University, Bratislava

Abstract: The relation of oxidn.-redn. reactions in Cu(II) complexes to the mutually related effect of ligands over the central atom is described. When some ligands enter the inner co.ovrddot.ordination sphere of Cu(II)-X (X = Cl, Br, I, CN, SCN) Cu(II) is reduced to Cu(I) and bound X- is oxidized to X (CuCl₂, CuBr₂, and Cu(SCN)₂ with Me₂CO). Some ligands (NH₃) stabilize Cu(II)-X against oxidn.-redn. changes, which explains the relative stability of CuI₂(NH₃)₂. If the inner co.ovrddot.ordination sphere of a Cu(II) complex is homogeneous, the conditions are not favorable for the change in Cu(II)-X, which explains the relative stability of Cu(CN)₄^2-. Decreasing electron release of X toward Cu(II) is in the order: thiourea and some org. C:S compds., ketones (Me₂CO, methyl ethyl ketone, diethyl ketone), ether, alcs., H₂O, NH₃, and pyridine, and some org. compds. bound to Cu through N. 66 references.

Full paper in Portable Document Format: 151a20.pdf (in Slovak)

Chemical Papers 15 (1) 20–35 (1961)