Synthesis, Characterization and Crystal Structure Determination of Iron(III) Complexes: [Fe(5,5 -dmbipy)2Cl2]Cl, [Fe(5,5 -dmbipy)2Cl2][FeCl4] and [Fe(5,5 -dmbipy)2Cl2]ClO4

Bipyridine and analogous ligands such as phenanthroline are commonly used in the formation of different complexes with a general variety of transition metals [1]. Studies of these transition metal complexes are important in understanding electron transfer processes, mixed valence complexes, magnetic coupling and magnetic transitions [2]. Although bipyridine coordination to iron has been widely investigated, most complexes are iron (II) complexes, little attention has been paid to bipyridine iron (III) complexes [3-5]. In order to expand this field, [Fe(5,5 -dmbipy)2Cl2]Cl complex (1), [Fe(5,5 -dmbipy)2Cl2][FeCl4] complex (2) and [Fe(5,5 -dmbipy)2Cl2]ClO4 complex (3) (5,5 -dmbipy is 5,5 -dimethyl-2,2 -bipyridine) were prepared from reaction of FeCl3.6H2O with 5,5 -dimethyl-2,2 -bipyridine in methanol, hydrochloric acid 0.1 M and sodium perchlorate respectively. These complexes were characterized by elemental analysis, IR, UV-Vis and 1H-NMR spectroscopy and their structures were studied by single-crystal diffraction method. In these complexes, FeIII ion is six-coordinated in a distorted octahedral environment.