Recognition of Some Lanthanides, Actinides, and Transition- and Heavy-Metal Cations by N-Donor Ligands: Thermodynamic and Kinetic Aspects

The remarkable actinide(III) selectivity of the polyaromatic N-donors bis-triazine-pyridines (BTPs), hemi-bis-triazine-pyridines (hemi-BTPs) and bis-triazine-bipyridines (BTBPs) make these ligands the most promising candidates in partitioning and transmutation processes developed so far to better ma...

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Published in:Inorganic chemistry 2010-02, Vol.49 (4), p.1363-1371
Main Authors: Hubscher-Bruder, Véronique, Haddaoui, Jaouad, Bouhroum, Saliha, Arnaud-Neu, Françoise
Format: Article
Language:English
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Summary:The remarkable actinide(III) selectivity of the polyaromatic N-donors bis-triazine-pyridines (BTPs), hemi-bis-triazine-pyridines (hemi-BTPs) and bis-triazine-bipyridines (BTBPs) make these ligands the most promising candidates in partitioning and transmutation processes developed so far to better manage nuclear waste. The interactions of n-Pr-BTP, C5-hemi-BTP, and the two most extensively investigated BTBPs (C5-BTBP and CyMe4-BTBP) have been studied with some representative lanthanide(III), uranyl, thorium, and transition- and other heavy-metal cations in methanol. The formation of complexes of different stoichiometries, the stability of which depended on both the ligands and the cations, was shown using UV absorption spectrophotometry. Study of the complexation reactions of La3+, Eu3+ and Yb3+ with these four ligands by stopped-flow spectrophotometry allowed determination of the rate constants and postulation of possible complexation mechanisms.
ISSN:0020-1669
1520-510X
DOI:10.1021/ic9010899