NUCL 118 |
| The focus of our research is the study of structure, bonding and dynamics of reactions in aqueous solutions by nuclear magnetic resonance (NMR) spectroscopy. Our targets are actinides, mainly uranium and thorium, and their reactions with natural ligands. The focus is on fundamental understanding, but this provides the basis also for understanding the behavior of these elements in engineering. NMR spectroscopy is an excellent tool to provide information on both the structure of complexes and rates and mechanisms of ligand exchange. The reactions may occur between ligands within the complex and/or between the coordinated ligands and the free ligand. The rate depends on all dynamic events in the coordination sphere. The mobility of multidentate ligands is smaller than that of water. Hence, the investigation of ternary complexes with no, or a small number of coordinated water molecules, provides insight on isomer formation and inter- and intra-molecular ligand exchange. The talk will summarize the most important NMR parameters, methods and their applications to study structure and ligand exchange in binary and ternary uranium(VI) systems. Complexes of type, UO22+-F-Ln-, where the ligand Ln- is a bidentate ligand will be discussed. Recent results on uranium(VI) complexes formed with multidentate ligands of biological interest will also be presented. |
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Developments in Advanced Characterization Techniques in Actinide and Transactinide Science
1:30 PM-4:30 PM, Thursday, April 10, 2008 Morial Convention Center -- Rm. 252, Oral
Division of Nuclear Chemistry & Technology |