Polarography of Iron(III)- and Europium(III)-Acetylacetonate Complexes in <i>N</i>,<i>N</i>-Dimethylformamide

Abstract

Abstract The reduction potentials of Fe(acac)3 and Eu(acac)3 in DMF are shifted to more positive potentials by the addition of cations (Li+ and Mg2+) to the supporting electrolyte of tetraethylammonium perchlorate. Studies of the complexes show that the effect is caused by coordinative relaxation reaction of the Fe(acac)3− reduction product in which acetylacetonate ligand becomes transferred to the cation. However, in the case of Eu(acac)3−, acetylacetonate ligands seemed to be completely stripped off. Cyclic voltammetric data indicate reduction and reoxidation processes of the complexes.