Speciation Techniques and Facilities for Radioactive Materials at Synchrotron Light Sources
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چکیده
The chemistry of the actinide family is surprisingly rich. In order to better understand the affinity of specific chelates as in the case of ionic selective recognition or uptake by specific biomolecules, it is essential to better understand the intramolecular interactions. Although this has long been done for widely investigated transition metals, very few studies have been devoted to complexation mechanisms of radionuclides by active chelation sites. In this field, X-ray absorption spectroscopy has been extensively used as a structural and electronic metal cation probe. The two examples that are presented here explore two domains of structural complexity: on the one hand small hydrate and hydroxide adducts of uranyl and neptunyl have been probed in order to extract physical chemical information on the actinide cation; on the other hand large complex systems as uranyl uptake by serum transferrin have been investigated in order to characterise the cation binding site.
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