Abstract
Absorption spectroscopic studies on the mixed-ligand complexes of Pr (III) and Nd (III) with 2,2′-bipyridyl and thiocyanate in pyridine, DMSO, DMF and methanol are presented. The oscillator strengths for the hypersensitive and non-hypersensitive transitions have been calculated and variation in the oscillator strength and band shapes with respect to solvent type is rationalized in terms of solvent structures and coordinating properties. A comparison is made with 1,10-phenanthroline complexes and has been shown that bpy is a weaker ligand than phen for these ions. Pyridine has been found most effective in promoting 4f–4f intensity and the increase in the oscillator strength in this solvent is due to dynamic ligand polarization mechanism.
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