ELECTROCHEMICAL APPROACH TO MONITORING METAL EXCHANGE-REACTION OF ACETYLACETONATE COMPLEXES WITH CADMIUM, COPPER AND ZINC IONS

Metal exchange reactions of acetylacetonate complexes with Cd(II), Cu( II) and Zn(II) ions were investigated by using cadmium and copper ion selective electrodes. Changes in the electrode potential and pH of the solutions were monitored upon adding the pertinent metal Zn(II) of th e acetylacetonate (AA) complexes. In the reverse system in which a sta ble Cu-AA complex exists in the solution prior to adding a secondary m etal ion (Cd(II) or Zn(II)), no Cu(II) was replaced by either ion. In the systems containing Cd(II) and Zn(II) as a complexed form with AA o r as free ions, the exchange reactions were not explained by consideri ng the equilibrium stability constants of the Cd-AA and Zn-AA complexe s.