Comparative 4f-4f Absorption Spectral Approach to Study the Complexation of Pr (iii) with Guanosine and Guanosine Tri Phosphate (gtp) in the Presence and Absence of Ca (ii)

The interactions of Pr (III) with some selected nucleosides and nucleotides have been studied in presence and absence of Ca (II) employing the comparative absorption spectroscopy involving the 4f-4f transitions in different organic solvents. The mode of binding of Pr(III) with different ligands (i.e. Guanosine and Guanosine Tri Phosphate (GTP) were interpreted from the evaluated various spectral parameters like Slater-Condon (Fk), Racah (E k ), Lande parameter (ξ4f), Nephelauxatic ratio (β), bonding parameter (b 1/2 ), Percentage covalency (δ). The variations in the values of intensiry parameters like Oscillator strength (P) and Judd Ofelt electric dipole intensity parameters (Tλ, λ= 2, 4, 6) are being used to investigate the nature of complexation of Lanthanides with the ligands.