Thermische und photochemische Eigenschaften von Chloro-Kupfer(II)-Komplexen in Acetonitril. I

Thermal and Photochemical Properties of Chloro Copper (II) Complexes in Acetonitrile. I. In the systems CuCl₂? AN spontaneous redox changes take place. Acetonitrile as a ligand with π-acceptor properties causes a mutual interaction of ligands in the coordination sphere; the Cu^II gets reduced to Cu^I while the chloro ligand is oxidized. Probably the system σ (Cu→N) and π (Cu→N) is formed. Spectrophotometrically has been found that the concentration of [CuCl₃(AN)]-ions, which above all undergo redox reactions, as also that of the ions [CuCl(AN)₃]⁺ increase with increasing temperature while the concentration of CuCl₂(AN)₂ decreases. The relationship between the composition of the coordination sphere and the redox properties of chloro copper(II) complexes in acetonitrile was proved.