Spectroscopic study of americium(III) complexes with nitrogen containing organic model ligands
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Publication Details
Output type: Journal article
Author list: Raditzky B, Sachs S, Schmeide K, Barkleit A, Geipel G, Bernhard G
Publisher: Elsevier
Publication year: 2013
Journal: Polyhedron (0277-5387)
Volume number: 65
Start page: 244
End page: 251
Number of pages: 8
ISSN: 0277-5387
eISSN: 1873-3719
Languages: English-Great Britain (EN-GB)
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Open access status: closed
Abstract
For the first time, the complexation of Am(III) with low molecular weight nitrogen containing aromatic model ligands, representing structural building blocks of humic acid, has been investigated using time-resolved laser-induced fluorescence spectroscopy (TRLFS). The complex formation with anthranilic acid and picolinic acid was studied at pH 3.8 and 6.0 at an ionic strength of 0.1 M (NaClO4) and room temperature. At pH 3.8, where both investigated ligands occur as zwitterionic species, a 1:1 Am(III) picolinate complex is formed with a stability constant of log beta(11) = 3.81 +/- 0.44. The Am(III) complexation with anthranilic acid in its zwitterionic form seems to be hindered, due to electrostatic repulsion between the protonated amino group and the metal ion. With both ligands, Am(III) complexes could be identified at pH 6.0, where the fully deprotonated species of anthranilic acid and picolinic acid occur. Under the given experimental conditions, a 1:1 Am(III) anthranilate complex with log beta(11) = 3.70 +/- 0.11 is formed. For the Am(III) picolinate system 1:1 and 1:2 complexes with log beta(11) = 3.83 +/- 0.22 and log beta(12) = 7.34 +/- 0.04, respectively, were identified. For comparison, the complex formation of Am(III) was also studied with phthalic acid as an example for the interaction of Am(III) with carboxylic groups. (C) 2013 Elsevier Ltd. All rights reserved.
Keywords
Americium(III), Anthranilic acid, Complexation, Nitrogen containing model ligands, Phthalic acid, Picolinic acid, TRLFS, UV-Vis
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