Collect. Czech. Chem. Commun. 1998, 63, 1963-1968

Electrochemical Studies of the Stability of Copper β-Diketone Chelates

Wulfhard Mickler, Anke Mönner and Erhard Uhlemann

Universität Potsdam, Institut für Anorganische Chemie und Didaktik der Chemie, PF 60 15 53, D-14415 Potsdam, Germany


The voltammetric reduction of copper β-diketone chelates was used to get information on their complex stability. 1,1,1-Trifluoropentane-2,4-dione, pentane-2,4-dione, 1-phenylbutane-1,3-dione, 1,3-diphenylpropane-1,3-dione and 2,2,6,6-tetramethylheptane-3,5-dione were chosen as model ligands. The complexes were reduced in two separate steps the first of which proved to be reversible. The experimental data are suitable for calculation of the relative stability constants of corresponding Cu(I) and Cu(II) complexes. The data well correlate with the overall stability constants determined potentiometrically. The results were applied to some new hydrophobic β-diketones which are not accessible to potentiometric measurements.

Keywords: Electrochemistry; Voltammetry; Complex stability constants; Copper complexes; β-Diketones; Chelates.