A first phosphine oxide-based extractant with high Am/Cm selectivity

A first phosphine oxide-based extractant with high Am/Cm selectivity

A new phosphine oxide ligand demonstrates high selectivity for the Am-Cm pair with SF = 2.9-3.5 and the Am-Eu pair with SF = 7.3-8.5 in a range of 0.1-3 M nitric acid. Thermodynamic measurements show that the entropy factor is responsible for selectivity observed in the extraction experiment. The mo...

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Veröffentlicht in:Dalton transactions : an international journal of inorganic chemistry 2019-02, Vol.48 (8), p.2554-2559
Hauptverfasser: Matveev, P I, Borisova, N E, Andreadi, N G, Zakirova, G G, Petrov, V G, Belova, E V, Kalmykov, S N, Myasoedov, B F
Format: Artikel
Sprache:eng
Schlagworte:
Coordination compounds
Ligands
Nitric acid
Phosphine oxide
Selectivity
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Zusammenfassung:A new phosphine oxide ligand demonstrates high selectivity for the Am-Cm pair with SF = 2.9-3.5 and the Am-Eu pair with SF = 7.3-8.5 in a range of 0.1-3 M nitric acid. Thermodynamic measurements show that the entropy factor is responsible for selectivity observed in the extraction experiment. The most prevalent complexes of all three metal ions were (Ph2PyPO)2M(NO3)3. According to their DFT modelling, the M-N distances for the Cm ion were larger than those for Am, so the last ion enters deeper into the pseudo-cavity of the ligand, which causes the observed selectivity.
ISSN:1477-9226
1477-9234
DOI:10.1039/c8dt04729d