Comparative NMR Study of nPrBTP and iPrBTP |
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| Institution: | 1. Karlsruhe Institute of Technology (KIT), Institute for Nuclear Waste Disposal (INE), Herrmann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany;2. Fraunhofer Institute for Chemical Technology (ICT), Environmental Engineering, Joseph-von-Fraunhofer-Str. 7, 76327 Pfinztal, Germany;3. Helmholtz-Zentrum Dresden - Rossendorf e. V., Institute of Resource Ecology, Bautzner Landstrasse 400, 01328 Dresden, Germany;4. University of Heidelberg, Department of Physical Chemistry, Im Neuenheimer Feld 253, 69120 Heidelberg, Germany |
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| Abstract: | Bistriazinyl-pyridine type ligands are important extracting agents for separating trivalent actinide ions from trivalent lanthanides. The alkyl substituents on the lateral triazine rings have a significant effect on the stability of the ligand against hydrolysis and radiolysis. Furthermore they influence solubility, extraction behaviour and selectivity. TRLFS and extraction studies suggest differences in complexation and extraction behaviour of BTP ligands bearing iso-propyl or n-propyl substituents, respectively. As NMR studies allow insight into the metal-ligand bonding, we conducted NMR studies on a range of 15N-labelled nPrBTP and iPrBTP Ln(III) and Am(III) complexes. Our results show that no strong change in the metal-ligand bonding occurs, thus excluding electronic reasons for differences in complexation behaviour, extraction kinetics and selectivity. This supports mechanistic reasons for the observed differences. |
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| Keywords: | NMR Spectroscopy Bonding Extraction BTP An(III)/Ln(III) separation |
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