Abstract
Complexation study of acetohydroxamic (AHA) ligand with La(III), Nd(III), Eu(III), Er(III), and Lu(III), as representative of lanthanide (Ln) series, has been described, in presence of pure nitrate and combination of nitrate and perchlorate ions using various spectroscopic analysis and density functional theory (DFT) calculations. Nuclear magnetic resonance (NMR) spectroscopy reports the bidentate mode of coordination of Z-Keto tautomer of AHA monomer with La(III). Formation of 1:3 Nd(III)-AHA complexes in presence of pure nitrate and a combination of nitrate and perchlorate ions has been observed from ultraviolet-visible (UV-Vis) spectroscopy analysis. The geometrical parameter analysis exhibit the bidentate mode coordination fashion of the AHA monomer which corroborates the NMR results. The geometrical parameter, frontier orbital(HOMO-LUMO), global reactivity descriptors and local reactivity descriptors analysis supports the findings of the spectroscopy titration methods that stability of Ln-AHA complexes decreases in the presence of pure nitrate ions than in presence of both perchlorate and nitrate ions. The trend of theoretical NMR chemical shifts of AHA and La(III)-AHA complexes support the experimental NMR chemical shifts. This work helps to measure subtle differences in complexation behaviour of AHA with Ln in presence of pure nitrate and a combination of nitrate and perchlorate ions quantitatively, providing information about the Ln-AHA structural environment.
Graphic abstract
Various spectroscopic methods (UV-Vis, NMR, and Fluorescence spectroscopy) and density functional theory (DFT) calculations have been implemented for structural characterization of lanthanides (Ln(III))-acetohydroxamic acid(AHA) complexes in the presence of a combination of both perchlorate and nitrate ions and in pure nitrate ions. The Ln(III)-AHA complexes show more stability in the presence of a combination of both perchlorate and nitrate ions than in the presence of nitrate ions which is supported by DFT calculations.
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20 July 2021
A Correction to this paper has been published: https://doi.org/10.1007/s12039-021-01948-9
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The original online version of this article was revised: to include the author Snehanshu Pal and to include the affiliation for author T. K. Kundu.
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Pati, A., Bhattacharyya, A., Pujari, P.K. et al. Investigation of lanthanide complexation with acetohydroxamic acid in nitrate medium: experimental and DFT studies. J Chem Sci 133, 60 (2021). https://doi.org/10.1007/s12039-021-01927-0
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DOI: https://doi.org/10.1007/s12039-021-01927-0