Synergistic extraction of alkaline earth cations with 3-phenyl-4-benzoyl-isoxazol-5-one and tri-n-octylphosphine oxide in toluene

Synergistic extraction of some divalent metal cations with 3-phenyl-4-benzoylisoxazol-5-one and P=O donor ligands in chloroform

“…The synergistic extraction of divalent cations (alkaline earths, Cu and less extensively Zn, Mn, Cd, Co, Ni) with HPBI in the presence of TOPO in toluene has been described in recent papers [11,12]. Complementary experiments using toluene as diluent have been performed in the present work, i.e.…”

“…The HPBI-TOPO interactions are quite important (logK int = 1.85) in comparison to the HPMBP-TOPO ones (logK int = 0.85) [11,12]. They must be taken into account to analyse the metal distribution data.…”

“…Nevertheless, only a few papers concerning the synergistic extraction of metal cations with HPBI in the presence of solvating extractants (e.g. trioctylphosphine oxide, TOPO) [5,[8][9][10][11][12] are available. The present work deals with the synergistic extraction of some divalent cations (Cd, Cu, Mn, Zn) with HPBI in the presence of TOPO or of the bidentate ligands, octyl(phenyl)(N,Ndiisobutylcarbamoylmethyl)phosphine oxide (CMPO) or bis(diphenylphosphinyl)methane (BDPPM) in chloroform.…”

“…A previous study of the extraction of the same cations by acylpyrazolones or acylisoxazolones in the presence of TOPO in toluene emphasized the role of the interactions between the extractants upon the extraction efficiency and selectivity. Since chloroform was shown to limit this interaction [11,12] and also to hinder the formation of third phases which often occur in HPBI-toluene extraction systems in absence of synergistic agents [12], it has been chosen for the present study. Some of the extractions described in this paper have also been studied in toluene to allow a better knowledge of the diluent effect.…”

Synergistic Ion-pair Extraction of Strontium Ion with Tri-n-octylphosphine Oxide and Dicyclohexano-18-crown-6

“…In the extraction of Sr, however, TOPO has been used only as a synergistic extraction agent for its chelate extraction. [10][11][12] Our research group has investigated various IL extraction research for metals [13][14][15][16][17][18] including Sr. 19,20 In our fundamental investigation of several extraction separation techniques using a cyclohexane/water/IL triphasic system, 21 we found a clue that two neutral extractants, TOPO and dicyclohexano-18-crown-6 (DC18C6), may show some unique synergistic effect in ion-pair extraction of Sr into cyclohexane using bis(trifluoromethanesulfonyl)imide (Tf2N -), which is well known as an IL anion, as counteranion. In previous, only limited paper 22 was published on the synergistic effect of TOPO and a crown ether with suitable cavity; the researchers discuss ion-pair extraction of silver(I) (ionic radius = 129 nm) into chloroform with TOPO, dibenzo-18-crown-6 and picrate.…”