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Update on the investigation of the ligand configuration in Th(IV) N-donor ligand complexes

Sittel, Thomas ORCID iD icon 1; Trumm, Michael; Adam, Christian; Geist, Andreas ORCID iD icon 1; Panak, Petra 1
1 Institut für Nukleare Entsorgung (INE), Karlsruher Institut für Technologie (KIT)


For the separation of trivalent actinides and lanthanides highly selective ligands are required. Soft N-donor ligands such as bis(triazinyl)pyridines (BTPs) are known for their high selectivity.1, 2 The molecular origin of the selectivity still is a topic of fundamental scientific interest.

To probe the effect of the cation’s nuclear charge on the bonding properties in actinide N-donor complexes, we extended our studies to tetravalent actinides. Here, we report a NMR spectroscopic and theoretical investigation on the complexation of Th(IV) with nPr-BTP. For the first time we observed the formation of different complex species for [Th(nPr-BTP)3](OTf)4 depending on the solvent used. The higher charge compared to An(III) and Ln(III) results in a stronger complex-solvent interaction which leads to slightly different ligand configurations in the complex.3 The ligand configuration highly depends on the solvent’s ability to actively form H-bonds. This correlation was found by preparing [Th(nPr-BTP)3](OTf)4 in a range of deuterated organic solvents as well as in binary solvent mixtures.

The figure above shows the results of the 15N NMR data analysis of [Th(nPr-BTP)3]4+ in THF-d8 (lower spectrum) and methanol-d4 (upper spectrum). ... mehr

Zugehörige Institution(en) am KIT Institut für Nukleare Entsorgung (INE)
Publikationstyp Poster
Publikationsdatum 21.09.2022
Sprache Englisch
Identifikator KITopen-ID: 1000154337
HGF-Programm 32.11.03 (POF IV, LK 01) Fundamental Scientific Aspects
Veranstaltung Actinides Revisited (2022), Dresden, Deutschland, 21.09.2022 – 23.09.2022
Projektinformation f-Char (BMBF, 02NUK059A)
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