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Issue 39, 2013
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Evidence for covalence in a N-donor complex of americium(iii)

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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)33+ complex with a 15N labelled ligand showed that it exhibits large differences in 15N 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.

Graphical abstract: Evidence for covalence in a N-donor complex of americium(iii)

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The article was received on 10 Apr 2013, accepted on 26 May 2013 and first published on 10 Jun 2013

Article type: Paper
DOI: 10.1039/C3DT50953B
Dalton Trans., 2013,42, 14068-14074

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    Evidence for covalence in a N-donor complex of americium(III)

    C. Adam, P. Kaden, B. B. Beele, U. Müllich, S. Trumm, A. Geist, P. J. Panak and M. A. Denecke, Dalton Trans., 2013, 42, 14068
    DOI: 10.1039/C3DT50953B

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