Département de chimie moléculaire

The electrochem. behavior of the iron(III) complexes [Fe(L)2Cl2]+ and [Fe2O(L)4Cl2]2+ [L = 2,2'-bipyridine (bpy) and 4,4'-dimethyl-2,2'-bipyridine (dmbpy)] was studied in acetonitrile. Their redn. leads to the iron(II) complex ion [Fe(L)3]2+, accompanied by the release of Cl- ions and the formation of [FeCl4]- ions or by the formation of an unidentified Fe(III) chloro oxide, depending on the starting complex. These two new chloro complexes can be further reduced into Fe(II) species at a more neg. potential. [Fe(L)2Cl2]+ can be obtained in good yield via the electrochem. oxidn. of [Fe(L)3]2+ in the presence of free Cl- anions, at least for L = dmbpy. The crystal structure of the new mono- and binuclear dmbpy complexes was detd. by x-ray diffraction. [on SciFinder(R)]