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See detailApplications de la résonance magnétique nucléaire à la chimie des actinides et au retraitement des combustibles nucléaires.
Vidick, Geoffrey ULg

Doctoral thesis (2012)

This research work is dedicated to develop and bring to light the contribution of nuclear magnetic resonance (NMR) in the study of the actinide ions and their complexes in aqueous or in organic solvents ... [more ▼]

This research work is dedicated to develop and bring to light the contribution of nuclear magnetic resonance (NMR) in the study of the actinide ions and their complexes in aqueous or in organic solvents. We use several advanced NMR techniques. The dispersion of the longitudinal relaxation time T1 of solvent nuclei with the magnetic field (NMRD) yields information on the magnetic properties of paramagnetic actinide ions. The sensitivity of NMR to the exact nature of the ground state of actinide ions is also illustrated by detailed studies on the complexes of U, Np, Pu, Am and Cm in different oxidation states. It will be shown that the paramagnetic shifts induced by the actinide ions originate from both a through space dipolar contribution and a through bonds contact contribution. The latter gives access to delocalized unpaired electron densities that are directly related to the covalency of the actinide-ligand bonds. However, electronic densities can only be obtained after separation of the two contributions. This separation made thanks three different methods based on studies with variable temperature and by synthesizing highly symmetric and anisotropic complexes. The use of dipolar contribution can be, as for her, related to the geometry of complexes formed in solution. This method of determination of solution structure is illustrated in the case of four specially designed N-polyaromatic ligands actinide/lanthanide partitioning by liquid-liquid extraction, an essential step for the ultimate nuclear fuel reprocessing. Besides their structure determination, the use of NMR techniques allowed of determined the stoechiometry and speciation in solution of these complexes. [less ▲]

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See detailNuclear Magnetic Resonance and Nuclear Waste Reprocessing.
Vidick, Geoffrey ULg; Bouslimani, Nouri; Desreux, Jean-François ULg

Poster (2011, November 22)

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See detailNMR investigation of the lanthanide and actinide complexes of bis-triazine extracting agents
Desreux, Jean-François ULg; Vidick, Geoffrey ULg; Bouslimani, Nouri

in Valuenza, Fernando L.; Moyer, Bruce A. (Eds.) 19th International Solvent Extraction Conference (2011, October 07)

Nuclear magnetic resonance spectroscopy (NMR) is applied to unravel the solution structure and the stoichiometry of the complexes formed between bis-triazine extracting agents (BTP and BTBP) and ... [more ▼]

Nuclear magnetic resonance spectroscopy (NMR) is applied to unravel the solution structure and the stoichiometry of the complexes formed between bis-triazine extracting agents (BTP and BTBP) and paramagnetic lanthanide ions. Highly rigid lanthanide perchlorate tris-complexes of threefold symmetry are formed by the pyridine bis-triazine BTP¿s while the bipyridine analogues (BTBP) form bis-complexes with a more open structure that leaves enough space for solvent molecules or anions. The nitrate ion is unable to enter the first coordination sphere of the tris-BTP complexes but the structure and stoichiometry of the bis-BTBP chelates are profoundly modified in presence of this ion. The NMR analysis is extended to actinides in various oxidation states despite technical difficulties. The NpO2+ ion is shown to form a 1:1 BTP complex in which the ligand is located in the plane perpendicular to the dioxo unit. No covalency contribution could be detected in the NMR spectra but such a contribution is clearly visible in the case of Am3+ and Cm3+. The latter induces very large paramagnetic shifts with a large contact contribution. [less ▲]

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See detailHighly Efficient Separation of Actinide from Lanthanide by a Phenanthroline-Derived Bis-triazine Ligand
Lewis, Frank W.; Harwood, Laurence M.; Hudson, Michael J. et al

in Journal of the American Chemical Society (2011), 133

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See detailNuclear Magnetic Resonance and Nuclear Waste Reprocessing.
Vidick, Geoffrey ULg; Bouslimani, Nouri; Desreux, Jean-François ULg

Poster (2011, April 29)

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See detailNMR Spectroscopy actinide complexes: In search of covalency effects
Desreux, Jean-François ULg; Vidick, Geoffrey ULg; Bouslimani, Nouri et al

Conference (2011, April 05)

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See detailDéveloppements récents dans l’élaboration de composés radiopharmaceutiques au 99mTc.
Vidick, Geoffrey ULg

Scientific conference (2010, December 03)

Nouveaux développements dans la production de radio-pharmaceutiques au 99mTc et mise en perspective de l'apport de la chimie dans ce domaine.

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See detailNMR studies on radioactive actinide complexes. A completely foolish idea?
Vidick, Geoffrey ULg; Bouslimani, Nouri; Desreux, Jean-François ULg

Conference (2010, November 26)

The complete separation of actinides and lanthanides by solvent extraction is an important step in the reprocessing of nuclear wastes. The trivalent ions of these two families of f elements have very ... [more ▼]

The complete separation of actinides and lanthanides by solvent extraction is an important step in the reprocessing of nuclear wastes. The trivalent ions of these two families of f elements have very similar properties and it is only recently that an effective separation method has been developed. It is assumed that this separation can be achieved because of small differences in the covalency of the coordination bonds formed by the f ions but this has not been proved so far. We embarked into the first NMR study of the actinide complexes with the hope of better unravelling their solution structures and of clarifying the role of covalency. Nuclear magnetic resonance has nearly never been used for investigating actinide ions and their complexes not only because of their radioactivity and their toxicity but also because of the lack of dedicated spectrometers. It was also assumed that paramagnetism would cause excessive line broadenings. Many difficulties had thus to be overcome and the first step in our work was to show that well-resolved NMR spectra of actinide complexes (U to Cm) could indeed be obtained. Relatively narrow resonances have been observed for a variety of ions in different oxidation states provided their complexes are stable, symmetric and rigid. We used several advanced NMR techniques in order to fully characterize the actinide ions and their chelates in water or in organic solvents. The dispersion of the longitudinal relaxation time T1 of solvent nuclei with the magnetic field (NMRD) yields information on the magnetic properties and on the dynamic behaviour of paramagnetic species; 17O NMR allows the measurement of the water exchange times and 1H and 13C spectra yield information on the solution structures of the complexes. It will be shown that the paramagnetic shifts induced by the actinide ions originate from both a through space dipolar contribution and a through bonds contact contribution. The latter gives access to delocalized unpaired electron densities that are directly related to the covalency of the metal-ligand bonds. However, electron densities can only be obtained after separation of the two contributions. This could be accomplished thanks to variable temperature studies. In another approach, new ligands with rigid aliphatic substituents have been synthesized and contact contribution were deduced with the assumption that delocalization does not proceed to the 1H nuclei most removed from the metal center. This study has been extended to actinides in the trivalent, tetravalent and hexavalent states and new ligands have been synthesized in order to increase the magnetic anisotropy while keeping the symmetry and the rigidity needed to simplify the NMR analyses. [less ▲]

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See detailStudies on the Interaction of a Novel 6,6¿¿- bis(1,2,4-triazin-3-yl)-,2¿:6¿,2¿¿-terpyridine Ligand with Lanthanide(III) Ions and Americium(III)
Lewis, Frank W.; Harwood, Laurence M.; Hudson, Michael J. et al

Conference (2010, April 01)

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See detailAN NMR INVESTIGATION OF THE ACTINIDE IONS AND THEIR COMPLEXES
Vidick, Geoffrey ULg; Bouslimani, Nouri; Desreux, Jean-François ULg

Poster (2010, January 28)

We currently use several advanced NMR techniques in order to fully characterize actinide ions and their complexes in water or in organic solvents. The dispersion of the longitudinal relaxation time T1 of ... [more ▼]

We currently use several advanced NMR techniques in order to fully characterize actinide ions and their complexes in water or in organic solvents. The dispersion of the longitudinal relaxation time T1 of solvent nuclei with the magnetic field (NMRD) yields information on the magnetic properties and on the dynamic behavior of paramagnetic species. 17O NMR allows the measurement of the water exchange times and 1H and 13C spectra yield information on the solution structures of the complexes and on the covalency of their coordination bonds. The application of NMR in actinide science will be illustrated with studies on the U, Np, Pu and Cm ions in different oxidation states and on their complexes. For instance, Cm3+ ion is the actinide analogue of Gd3+ but is not in a pure 8S state as indicated by much lower relaxation rates and much shortened electronic relaxation rates. In keeping with EPR studies1, Cm3+ does not have a perfectly spherical distribution of its unpaired electronic spins because of a much stronger spin-orbit coupling. Moreover, the Cm3+ relaxivity originates from three different processes: a dipolar coupling between the nuclear and electronic spins, a delocalization of unpaired electronic spins into the solvent orbitals (contact interaction) and a Curie contribution. Each process gives rise to an inflection point in the NMRD curves and the contact interaction reflects the partial covalency of the coordination bonds formed by Cm3+. A contact contribution is also observed in the NMR spectra of Cm3+ complexes. The sensitivity of NMR to the exact nature of the ground state of actinide ions is also illustrated by detailed studies on the U, Np and Pu ions in different oxidation states. For instance, a comparison of the NMRD curves of the 5f2 ions U4+, NpO2+ and PuO22+ indicates that the two dioxo cations have abnormally long electronic relaxation times. However, well-resolved 1H NMR spectra of their complexes can be obtained provided the solution species are sufficiently rigid. It will be shown that NpO2+ and PuO22+ induce dipolar paramagnetic shifts from which the solution structure can be deduced. [less ▲]

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See detailInteraction of 6,6-bis(5,5,8,8-tetramethyl-5,6,7,8-tetrahydro-1,2,4-benzotriazin-3-yl)-2,2:6,2-terpyridine (CyMe4-BTTP) with some trivalent ions such as lanthanide(III) ions and americium(III)
Lewis, Frank; Harwood, Laurance; Hudson, Michael J. et al

in Dalton Transactions (2010), 39

The new solvent extraction reagent 6,6’’-bis(5,5,8,8-tetramethyl-5,6,7,8-tetrahydro-1,2,4-benzotriazin-3-yl)-2,2’:6’,2’’-terpyridine (CyMe4-BTTP) has been synthesized in 4 steps from 2,2’:6’,2’’ ... [more ▼]

The new solvent extraction reagent 6,6’’-bis(5,5,8,8-tetramethyl-5,6,7,8-tetrahydro-1,2,4-benzotriazin-3-yl)-2,2’:6’,2’’-terpyridine (CyMe4-BTTP) has been synthesized in 4 steps from 2,2’:6’,2’’-terpyridine. Detailed NMR and mass spectrometry studies indicate that the ligand forms 1:2 complexes with lanthanide(III) perchlorates where the aliphatic rings are conformationally constrained whereas 1:1 complexes are formed with lanthanide(III) nitrates where the rings are conformationally mobile. An optimized structure of the 1:2 solution complex with Yb(III) was obtained from the relative magnitude of the induced paramagnetic shifts. X-ray crystallographic structures of the ligand and of its 1:1 complex with Y(III) were also obtained. The NMR and mass spectra of [Pd(CyMe4-BTTP)]n2n+ are consistent with a dinuclear double helical structure (n = 2). In the absence of a phase-modifier, CyMe4-BTTP in 1-octanol showed a maximum distribution coefficient of Am(III) of 0.039 (±20%) and a maximum separation factor of Am(III) over Eu(III) of 12.0 from nitric acid. From nitric acid, the metal(III) cations are extracted as the 1:1 complex. The generally low distribution coefficients observed compared with the BTBPs arise because the 1:1 complex of CyMe4-BTTP is considerably less hydrophobic than the 1:2 complexes formed by the BTBPs. In M(BTTP)3+ complexes, there is a competition between the nitrate ions and the ligand for the complexation of the metal. [less ▲]

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See detailNMR Studies of Solutions of Actinide Ions and their Complexes. Relaxation and Spectroscopy
Braekers, Damien; Peters, Christelle; Vidick, Geoffrey ULg et al

Poster (2008, July)

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