First phosphine oxide-based extractant with high Am/Cm selectivityстатьяИсследовательская статья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 20 мая 2020 г.
Аннотация:A new phosphine oxide ligand demonstrates high selectivity for the Am-Cm pair SF = 2.9-3.5 and the Am-Eu pair 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 the DFT modelling of of them, the M-N distances for the Cm ion were larger than for Am, so the last ion enters deeper into the pseudo-cavity of the ligand, what causes the observed selectivity.