Effect of the nature of substituents at the phosphorus atom on extraction properties of phosphorylketones toward f-elements

Abstract

Extraction abilities of phosphorylketones with alkyl and cycloalkyl substituents at the phos phorus atom R 2 P(O)CH 2 CH 2 C(O)Me (R = Pr i , Bu t ) and R 2 P(O)CHPhCH 2 C(O)Me (R = Pr i , cyclo C 6 H 11 ) toward U VI , Th IV , and a series of tervalent lanthanides (La III , Nd III , Ho III , Yb III ) were studied. The efficiencies and selectivities of recovery of f elements from nitric acid solutions to chloroform by these ligands were compared with extraction properties of both the model phosphorylketones with phenyl substituents at the phosphorus atom Ph 2 P(O)CH 2 CH 2 C(O)Me and Ph 2 P(O)CHPhCH 2 C(O)Me and other known extractants such as tributyl phosphate (BuO) 3 P(O), trioctylphosphine oxide (C 8 H 17 ) 3 P(O), and carbamoylphos phine oxide Ph 2 P(O)CH 2 C(O)NBu 2 .

Ligands for f-element extraction used in the nuclear fuel cycle

“…On the other hand, the selectivity of ligands BPO-2 and BPO-3 for Yb(III) towards the other metal was good (D Yb E 4, D La and D Nd = 0.4-1 for BPO-2 and BPO-3, respectively, at 4 M HNO 3 ). 103 The reduction of the ketone to an alcohol led to a reversal of the selectivity, compared to phosphorylketones. Ligands BPO-6-8 (Chart 14) showed a preference for light Ln(III) over heavier ones, followed by U(VI).…”