Calculation and Comparison of Energy Interaction and Intensity Parameters for the Interaction of Nd(III) with DL-Valine, DL-Alanine and β-Alanine in Presence and Absence of Ca2+/Zn<

Abstract

Absorption difference and comparative absorption spectrophotometric studies involving 4f-4f transitions of Nd(III) and different amino acids: DL-valine, DL-alanine, and β-alanine in presence and absence of Ca(II) and Zn(II) in aqueous and different aquated organic solvents have been carried out. Variations in the spectral energy parameters: Slater-Condon (F K ) factor, Racah (E K ) , Lande factor (ξ 4f ), nephelauxetic ratio (β), bonding (b 1/2 ), percentage covalency (δ) are calculated to explore the mode of interaction of Nd(III) with different amino acids: DL-valine, DL-alanine, and β-alanine. The values of experimentally calculated oscillator strength (P) and computed values of Judd-Ofelt electric dipole intensity parameters, T λ (λ = 2,4,6), are also determined for different 4f-4f transitions. The variation in the values of P and T λ parameters explicitly shows the relative sensitivities of the 4f-4f transitions as well as the specific correlation between relative intensities, ligand structures, and nature of Nd(III)-ligand interaction.

Electronic Spectral Characterization and Antibacterial Activity of Lanthanide (Iii) - Ceftazidime Complexes

“…For all complexes, F k parameters follow the order: F 2 > F 4 > F 6 and E k values follow the order E 1 > E 3 > E 2 , which are in agreement with the finding of earlier workers [43]. There is a small decrease in value of F k , E k and ζ 4f parameters as compared to corresponding parameters of the free ion which suggesting the expansion of the central metal ion orbital on complexation [44]. The values of β are found to be less than unity and the values of the covalency factor b 1/2 and Sinha's parameter δ% are found to be positive in these complexes which is indicating convalent characters in the lanthanide-ligand bonding [45].…”

4f–4f Spectral Analysis and Solvent Effect for the Interaction of Pr(III) with l-Tryptophan Using Different Aquated Solvents in the Presence and Absence of Zn(II)

“…This intensification of peaks are more even when Zn(II) is added to the mixture of Pr(III) and l-tryptophan. The more intensified peaks in the presence of Zn(II) may be due to their preference to interact with the amino group of l-tryptophan and formation of heterobimetallic complexation of Pr(III):ltryptophan:Zn(II) [8,15]. The calculated energy parameters are shown in Table 1.…”

“…The spectral analysis of 4f-4f transitions can provide an insight into the structure of a lanthanide complex [10]. The analysis of spectral properties of pseudo-hypersensitive and hypersensitive transitions for complexes formed between Pr(III)/Nd(III) with amino acids, polypeptides and other O/N-donor ligands in different organic solvents have been carried out using 4f-4f absorption spectral data and energy interaction parameters were also calculated between the lanthanide ions and ligands [11][12][13][14][15]. The binding behavior of amino acid during the interaction between Pr(III) with lysozyme were studied [16].…”