Journal
DALTON TRANSACTIONS
Volume 42, Issue 39, Pages 14068-14074Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3dt50953b
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- German Federal Ministry of Education and Research (BMBF) [02NUK012A, 02NUK012D, 02NUK020A]
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The molecular origin of the selectivity of N-donor ligands, such as alkylated bis-triazinyl pyridines (BTPs), for actinide complexation in the presence of lanthanides is still largely unclear. NMR investigations of an Am(nPrBTP)(3)(3+) complex with a N-15 labelled ligand showed that it exhibits large differences in N-15 chemical shift for coordinating N-atoms in comparison to both lanthanide(III) complexes and the free ligand. The temperature dependence of NMR chemical shifts observed for this complex indicates a weak paramagnetism. This fact and the observed large chemical shift for bound nitrogen atoms allow us to conclude that metal-ligand bonding in the reported Am(III) N-donor complex has a larger share of covalence than in lanthanide complexes. This may account for the observed selectivity.
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