Computation of spectral parameters for the complexation of Pr(III) with L-Histidine through 4f-4f transition spectra: Further analysis of its kinetic and thermodynamic parameters

Abstract

The interaction of Pr(III) with L-Histidine has been analysed through 4f-4f transition spectra in different solvents. Mode of binding of Pr(III) with L-Histidine is interpreted considering the variations in evaluated values of intensity parameters like oscillator strength (P) and Judd Ofelt electric dipole intensity parameters ‘Tλ’ (λ = 2,4,6). Energy interaction parameters like Slater–Condon (Fk's), Lande factor (ξ4f), Racah energy (Ek), nephelauxetic effect (β), bonding (b1/2) and percent covalency (δ). It is further studied through kinetics, subsequently activation energy (Ea), pre-exponential factor (A), specific rate constant/rate constant (k) and thermodynamic parameters viz, ΔH°, ΔG°, ΔS° etc., has been evaluated from which detailed thermodynamical information for the complexation of Pr(III) with L-Histidine in DMF solvent can be explored. Solution spectral studies through kinetic approach could provide pertinent information about the mechanism, reaction pathways, and also about the mode of chemical bond.