Synthesis and crystal structure of a new dinuclear iron(III) complex: [Fe2O(PhCO2)2(2,2′-bpy) 2(N3)2]?H2O

Article abstract of DOI:10.1002/zaac.201000081

By using a precursor complex [Fe₃O(PhCO₂) ₆(H₂O)₃]NO₃ as starting material and 2,2′-bpy (= 2,2′-bipyridine) as rigid chelating ligand, the new dinuclear iron-oxido complex [Fe₂O(PhCO₂) ₂(2,2′-bpy)₂(N₃)₂]?H ₂O (1) was synthesized and structurally characterized. The reaction of [Fe₃O(PhCO₂)₆(H₂O) ₃]NO₃ with 2,2′-bpy and sodium azide in 1:3:3 ratio gave the dinuclear complex 1, whereas a 1:6:3 ratio reaction system only gave the complex [Fe(2,2′-bpy)₃]³⁺, which indicated that 2,2′-bipyridine plays a crucial function in the nuclear forming procedure. Meanwhile, the N₃^- ligands take up the chelating domain of oxygen and reduce the nucleation. Different π-π interactions exist in 1, which extend its structure to a three dimensional supramolecular framework.