BIMETALLIC REACTIVITY - OXO TRANSFER-REACTIONS WITH A HETEROBIMETALLIC COMPLEX OF IRON(II) AND VANADIUM(III)

Several mono- and bimetallic complexes of Fe(II) and V(III) with binuc leating macrocyclic systems have been prepared. Electrochemical studie s of complexes containing Fe(II) in the 6-coordinate site have shown t hat the FE(II/III) potential is affected by the length of the diamine chelate in this sin and by the occupancy of the open site. Oxidation o f the Fe-II-V-III complex, A, with 2,4,6-trimethyliodosobenzene produc ed the Fe-II-V-III complex, B. Both A and B have been characterized by X-ray crystallography, cyclic voltammetry, and infrared and electroni c spectroscopy. The origins of deactivation of two-metal oxidation in bimetallic complexes an discussed primarily in terms of the ligand reo rganizational energy, which is caned mechanical coupling.