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Effects of triphenylphosphine and its derivatives on the redox properties of cobalt and copper complexes with Schiff base ligands

A. Kotočová, D. Valigura, P. Fodran, and J. Šima

Department of Inorganic Chemistry, Slovak Technical University, CS-812 37 Bratislav

Abstract: The redox properties of N,N'-ethylenebis(thioacetylacetoniminato)cobalt(II) and N,N'-ethylenebis(thioacetylacetoniminato)copper(II) complexes (CoN₂S₂ and CuN₂S₂, resp.) were studied by cyclic voltammetry at a Pt electrode in MeOH soln. In the presence of triphenylphosphine, tritolylphosphine, and tris(3-chlorophenyl)phosphine, which are supposed to enter the coordination sphere of complexes, the redox potential of the electrode reaction {CoN₂S₂}⁺ + e^- ⇄ CoN₂S₂ was shifted to lower values (as a consequence of the preferential coordination of arylphosphine to {CoN₂S₂}). In this case also the effect of a substituent on the benzene ring of arylphosphine was studied. The redox potential of the reaction {CuN₂S₂}⁺ + e^- ⇄ CuN₂S₂ was analogously influenced by the presence of triphenylphosphine and its derivs., resp., however, not to the extent as for the above complex. In this case, no effect of the remote substituent was obsd.

Full paper in Portable Document Format: 381a67.pdf

Chemical Papers 38 (1) 67–73 (1984)