Spectroscopic studies of tris(2,2′-bipyridine)ruthenium(II) intercalated to modified α-zirconium phosphate

This paper presented the absorption and fluorescence spectra as well as luminescence lifetime of tris(2,2′-bipyridine)ruthenium(II) (abbreviated as Ru(bpy)32+) intercalated to modified α-zirconium phosphate in aqueous media. The results showed extensive red shifts of the absorption band of the metal complex (from 454 to 482 nm) and blue shifts of the emission maximum (from 610 to 582 nm) as compared to that of free chromophore. On the other hand, the luminescence intensities and the excited-state lifetimes of the metal complex were dramatically increased. X-ray diffraction (XRD) patterns of the powder samples indicated that intercalation of Ru(bpy)32+ into modified α-zirconium phosphate reduced somewhat the interlayer separation from 18.6 to 17.1 Å. In addition, spectroscopic measurements for Ru(bpy)32+ with modified α-zirconium phosphate in ethanol media were also proceeded. No significant difference was observed, which implied that Ru(bpy)32+ could not enter into modified α-zirconium phosphate in ethanol media.