Evidence for covalence in a N-donor complex of americium(III)
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 dif...
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| Hauptverfasser: | , , , , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
10 June 2013
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| In: |
Dalton transactions
Year: 2013, Jahrgang: 42, Heft: 39, Pages: 14068-14074 |
| ISSN: | 1477-9234 |
| DOI: | 10.1039/C3DT50953B |
| Online-Zugang: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1039/C3DT50953B Verlag, lizenzpflichtig, Volltext: https://pubs.rsc.org/en/content/articlelanding/2013/dt/c3dt50953b 
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| Verfasserangaben: | Christian Adam, Peter Kaden, Björn B. Beele, Udo Müllich, Sascha Trumm, Andreas Geist, Petra J. Panak and Melissa A. Denecke |
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| 245 | 1 | 0 | |a Evidence for covalence in a N-donor complex of americium(III) |c Christian Adam, Peter Kaden, Björn B. Beele, Udo Müllich, Sascha Trumm, Andreas Geist, Petra J. Panak and Melissa A. Denecke |
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| 520 | |a 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. | ||
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