Interaction of uranium(VI) with nitrogen containing model ligands studied by laser-induced fluorescence spectroscopy

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Publication Details

Output type: Journal article

Author list: Raditzky B., Schmeide K., Sachs S., Geipel G., Bernhard G.

Publisher: Elsevier

Publication year: 2010

Journal: Polyhedron (0277-5387)

Volume number: 29

Issue number: 1

Start page: 620

End page: 626

Number of pages: 7

ISSN: 0277-5387

eISSN: 1873-3719

URL: http://api.elsevier.com/content/abstract/scopus_id:79551655713

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Open access status: closed

Abstract

The complexation of uranium(VI) with two nitrogen containing organic ligands, representing model substances for humic acid building blocks, has been investigated at pH values between 1.5 and 4.5 and an ionic strength of 0.1 M (NaClO ). Using two independent fluorescence spectroscopic methods, time-resolved laser-induced fluorescence spectroscopy (TRLFS) and TRLFS with ultrafast pulses (fs-TRLFS), the complex formation of uranium(VI) with anthranilic and nicotinic acid in aqueous solution was studied. In both systems a decrease in the luminescence intensity was observed with increasing ligand or metal ion concentration. Uranium(VI) complexes of the type M L H were identified. Anthranilic acid forms a 1:1 complex under the given experimental conditions with a stability constant of log β = 8.00 ± 0.31. For the uranium(VI) nicotinate system 1:1 and 1:2 complexes could be identified. The corresponding formation constants were calculated to be log β = 8.59 ± 0.17 and log β = 17.18 ± 0.35. © 2009 Elsevier Ltd. All rights reserved.

Keywords

Anthranilic acid, Complexation, fs-TRLFS, Nicotinic acid, TRLFS, Uranium(VI)

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