Absorption spectral and thermodynamic analysis for the complexation of Pr3+ with L-phenylalanine in the presence/absence of Mg2+ using 4f–4f transitions spectra as probe

Herein, we delineate the complexation of Pr 3+ with L-phenylalanine in the presence/absence of Mg 2+ by computing the absorption spectral parameters, such as the energy interaction parameters: Slater–Condon factor ( F k ), Lande spin–orbit interaction ( ξ 4f ), Racah ( E k ), percent covalency ( δ ), bonding parameter ( b 1 / 2 ), and nephelauxetic ratio ( β ), as well as the intensity parameters: oscillator strength ( P ) and Judd–Ofelt intensity parameters T λ ( λ = 2, 4, 6) in various aqueous solutions of CH 3 CN, DMF, CH 3 OH, and C 4 H 8 O 2 at pH 4. The results of the interaction of metal with ligand, studied through 4f–4f transition spectra, were clearly shown by the variations in the calculated values of the intensity as well as energy interaction parameters. Pre-exponential factor ( A ), activation energy ( E a ), rate constant ( k ), and thermodynamic parameters: ΔSº, ΔGº, and ΔHº have been computed to analyze the reaction strategies as well as the thermodynamic properties of the complexation process of the metal (Pr 3+ ) with ligands (L-phenylalanine and Mg 2+ ). Graphical abstract