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Investigation of the Ligand Configuration in Th(IV) N-Donor Complexes

Sittel, Thomas; Adam, Christian; Geist, Andreas; Panak, Petra J.

For the separation of trivalent actinides and lanthanides highly selective ligands are required. Soft N-donor ligands like bis(triazinyl)pyridines (BTPs) are known for their high separation factors. Though several investigations on the interaction of actinides with these ligands are available, the molecular origin of the selectivity remains largely unclear and a topic of fundamental scientific interest. NMR spectroscopy is a valuable tool to determine interactions between metal ions and donor ligands. For actinides and lanthanides, the interactions are dominated by electrostatic interaction. However, due to the overlap of frontier orbitals, the interaction is also partially covalent, resulting in a change of electron density distribution in the ligand. This corresponds directly to the change of the local magnetic field and is therefore precisely observable by the chemical shift. It was found that the fraction of covalency in the metal nitrogen bond in Am(III) complexes is significantly higher than in similar weak paramagnetic lanthanide complexes [1].
In the present work, we performed NMR investigations on diamagnetic Th(IV) complexes with nPr-BTP and iPr-BTP. ... mehr

Zugehörige Institution(en) am KIT Institut für Nukleare Entsorgung (INE)
Publikationstyp Poster
Publikationsdatum 26.08.2019
Sprache Englisch
Identifikator KITopen-ID: 1000104156
HGF-Programm 32.01.04 (POF III, LK 01) Entw.u.Anpassung v.Speziationsmethoden
Veranstaltung 21th - 15th ISMAR - EUROMAR Joint Conference (2019), Berlin, Deutschland, 25.08.2019 – 30.08.2019
Schlagwörter Thorium, BTP, NMR, N-Donor Ligands
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