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NMR and TRLFS studies of Ln(III) and An(III) C5-BPP complexes

C5-BPP is a highly efficient N-donor ligand for the separation of trivalent actinides, An(III), from trivalent lanthanides, Ln(III). The molecular origin of the selectivity of C5-BPP and many other N-donor ligands of the BTP-type is still not entirely understood. We present here the first NMR studie...

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Hauptverfasser: Adam, Christian (VerfasserIn) , Beele, Björn B. (VerfasserIn) , Geist, Andreas (VerfasserIn) , Müllich, Udo (VerfasserIn) , Kaden, Peter (VerfasserIn) , Panak, Petra (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: 2015
In: Chemical science
Year: 2014, Jahrgang: 6, Heft: 2, Pages: 1548-1561
ISSN:2041-6539
DOI:10.1039/C4SC03103B
Online-Zugang:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1039/C4SC03103B
Verlag, lizenzpflichtig, Volltext: https://pubs.rsc.org/en/content/articlelanding/2015/sc/c4sc03103b
Volltext
Verfasserangaben:Christian Adam, Björn B. Beele, Andreas Geist, Udo Müllich, Peter Kaden and Petra J. Panak

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520 |a C5-BPP is a highly efficient N-donor ligand for the separation of trivalent actinides, An(III), from trivalent lanthanides, Ln(III). The molecular origin of the selectivity of C5-BPP and many other N-donor ligands of the BTP-type is still not entirely understood. We present here the first NMR studies on C5-BPP Ln(III) and An(III) complexes. C5-BPP is synthesized with 10% 15N labeling and characterized by NMR and LIFDI-MS methods. 15N NMR spectroscopy gives a detailed insight into the bonding of C5-BPP with lanthanides and Am(III) as a representative for trivalent actinide cations, revealing significant differences in 15N chemical shift for coordinating nitrogen atoms compared to Ln(III) complexes. The temperature dependence of NMR chemical shifts observed for the Am(III) complex indicates a weak paramagnetism. This as well as the observed large chemical shift for coordinating nitrogen atoms show that metal-ligand bonding in Am(C5-BPP)3 has a larger share of covalence than in lanthanide complexes, confirming earlier studies. The Am(C5-BPP)3 NMR sample is furthermore spiked with Cm(III) and characterized by time-resolved laser fluorescence spectroscopy (TRLFS), yielding important information on the speciation of trace amounts of minor complex species. 
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