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, International Union of Pure and Applied Chemistry
, Résumé en français
Ces éléments se caractérisent par une toxicité chimique et radiologique é levé e. Pour des raisons de sûreté , il est indispensable de disposer de données thermodynamiques et structurales sur les complexes d'actinides susceptibles d'être présents afin de disposer de modèles prédictifs de leur comportement dans l'environnement. Par ailleurs, ces actinides du dé but de sé rie se caracté risent par une chimie complexe en raison de leur aptitude à exister sous différents degrés d'oxydation (+III à +VI) en solution aqueuse, chacun pré sentant une ré activité spé cifique, Les applications civiles et militaires de l'énergie nucléaire sont à l'origine d'une dissémination d'actinides dans l'environnement ,
, La complexation des actinides par des ligands organiques en milieu aqueux a fait l'objet de nombreuses é tudes qui ont permis la cré ation de bases de donné es thermodynamiques. Cependant, des incohérences peuvent être relevées, notamment lorsqu'il s'agit d'acides organiques faibles pour lesquels il existe
, Ces composé s, sé cré té s par des microorganismes tels que des bacté ries et des levures, sont de puissants ché lateurs du fer qui, en permettant la solubilisation d'hydroxydes ferriques, assurent leur approvisionnement en fer. Les sidé rophores peuvent ê tre divisé s en trois classes principales selon leur groupe fonctionnel : hydroxamate (figure 1a), caté cholate et carboxylate. Les sidé rophores hydroxamates sont le plus souvent observé s dans les eaux naturelles. Ils forment des complexes trè s stables avec le fer(III), la complexation s'effectuant de manière bidentate. Le rapport charge/taille similaire pour Fe 3+ et Pu 4+ , et la ré activité des actinides té travalents, laissent supposer une coordination voisine pour les deux é lé ments et une stabilité é levé e des complexes formé s, en particulier avec la desferrioxamine B (DFB, figure 1b). La DFB possè de en effet trois groupes hydroxamates pouvant se lier aux ions mé talliques. La formation de ces ché lates trè s stables peut ainsi favoriser la migration des actinides dans la gé osphè re, Ce travail de thèse est axé sur l'étude de la complexation d'actinides tri-et té tra-valents avec un ligand organique naturel appartenant à la classe des sidé rophores
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