Study of [FeII(bpy)3]2+ complex encapsulated in zeolite Y

Tris complex of FeII with 2,2′ bipyridine (bpy) ligand, has been encapsulated in the supercages of zeolite Y and characterized by powder X-ray diffraction, Infrared spectroscopy, 57Fe Mössbauer, effect measurements and multinuclear NMR spectroscopy. The complex was prepared in the supercages of Zeolite Y by exchanging the cations of zeolite Y with FeII and its subsequent complexing with bpy ligand. Based on the comparison of the results obtained for [FeII(bpy)3](ClO4)2 and the [Fe(bpy)3]Y complexes, it has been inferred that there is significant structural distortion for the encapsulated complex and all Fe is present as FeII in low spin state, which is characterized by isomer shift, δ = 0.37 mm s−1 and quadrupole splitting, ΔEq = 0.81 mm s−1 as revealed by 57Fe Mössbauer spectroscopic measurements.