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

• Verfasst von: Adam, Christian [VerfasserIn]
• Verfasst von: Kaden, Peter [VerfasserIn]
• Verfasst von: Beele, Björn B. [VerfasserIn]
• Verfasst von: Müllich, Udo [VerfasserIn]
• Verfasst von: Trumm, Sascha [VerfasserIn]
• Verfasst von: Geist, Andreas [VerfasserIn]
• Verfasst von: Panak, Petra [VerfasserIn]
• Verfasst von: Denecke, Melissa A. [VerfasserIn]
• Titel: Evidence for covalence in a N-donor complex of americium(III)
• Verf.angabe: Christian Adam, Peter Kaden, Björn B. Beele, Udo Müllich, Sascha Trumm, Andreas Geist, Petra J. Panak and Melissa A. Denecke
• E-Jahr: 2013
• Jahr: 10 June 2013
• Umfang: 7 S.
• Fussnoten: Gesehen am 05.05.2021
• Titel Quelle: Enthalten in: Dalton transactions
• Ort Quelle: London : Soc., 1972
• Jahr Quelle: 2013
• Band/Heft Quelle: 42(2013), 39, Seite 14068-14074
• ISSN Quelle: 1477-9234
• DOI: doi:10.1039/C3DT50953B
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1757185224

Abstract

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.