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Extraction of Eu(III) with a synergistic mixture of polydentate  N -phosphorylated bis-ureas with the general formula ( i -PrO) 2 P(O)NHC(O)NHXNHC(O)NHP(O)( Oi -Pr) 2  (X = (CH 2 ) 7 , (CH 2 ) 2 O(CH 2 ) 2  and (CH 2 ) 2 O(CH 2 ) 2 O(CH 2 ) 2 ) and chlorinated cobalt bis(dicarbollide) ion (CCD − ) with formula  closo -[(1,2-C 2 B 9 H 8 Cl 3 ) 2 -3-Co] −  was studied using nitrobenzene as the solvent. Extraction of Eu(III) was very effective up to high concentrations of nitric acid. Eu(III) is most likely extracted into the organic phase as the [EuL 2 ] 3+  species whereas the positive charge of extracted complex is compensated by CCD and/or nitrate anions.

Synergistic extraction of Eu(III) with N -phosphorylated bis-ureas and chlorinated cobalt bis(dicarbollide) ion