Extraction Properties of P(O)-Modified N-Aryl-Carbamoylmethylphosphine Oxides in Nitric Acid Media

Novel polyfunctional neutral organophosphorus compounds, P(O)-modified N-aryl- carbamoylmethylphosphine oxides, Ph2P(O)CH2C(O)NH-(o-C6H4)(CH2)n-P(O)Ph2 and Ph2P(O)CH2C(O)NH-(m-C6H4)(CH2)n-P(O)Ph2 (n = 1,2), were synthesized and studied as extractants for U(VI), Th(IV) and Ln(III) from HNO3 solutions. The influence of aqueous and organic phases on the extraction efficiency was elucidated and stoichiometry of the complexes extracted was determined. Introduction of an additional phosphoryl group into the phenyl substitutent at the nitrogen atom of diphenyl(N-phenylcarbamoylmethyl)phosphine oxide resulted in an increase of the efficiency of U(VI), Th(IV), Ln(III), and Re(VII) extraction.

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