Tris complex of Fe^II 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 Fe^II and its subsequent complexing with bpy ligand. Based on the comparison of the results obtained for [Fe^II(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 Fe^II in low spin state, which is characterized by isomer shift, d = 0.37 mm s^-1 and quadrupole splitting, DE_q = 0.81 mm s^-1 as revealed by ⁵⁷Fe Mössbauer spectroscopic measurements.