Synergic Extraction of Divalent Transition Metals With Mixtures of 1-Phenyl-3-Methyl-4 Benzoyl- Pyrazol-5-One and Crown Ethers in Presence of Alkali or Alkaline Earth Ions

Abstract

The extraction of divalent transition metals (M = Cu, Zn, Co, Cd) with mixtures of 1-phenyl-3-methyl-4-benzoylpyrazol-5-one (HL) and crown-ethers (E = B15C5, 18C6, DC18C6, DB18C6, DC24C8, DB24C8 with B = benzo, DB = dibenzo, DC = dicyclohexyl) in chloroform has been studied. From 1.0 M K+ aqueous solutions, EK.ML, ion pairs have been extracted with 18C6 -type crown ether3 that have a good correspondence between their cavity size and the K+ diameter, -and with M = CO and Cd, metals with a higher stability of the ML anion. With B15C5, which has a cavity size too small to accoddate K+, the synergic extraction of Co is explained by the formation of E K.CoL Both CoL2E and EBa(CoL l2 (E = DB18C6)were extracted frgm 0.h~ Ba(N0 l . In all otAer experiments -extractions from 1 .OM LiC1, ~a~l ! t?a~0~ with 815C5, 1.On leave from Escola Tecnica Superior dtEnginyers Industrials de Barcelone (U.P.C.) Diagonal 649, 08028 Barcelona (Spains). SASTRE ET AL.18C6 and 24C8 -type crown ethers, extractions from 1.0 -M KC1 with DB24~8, extractions from 0.33M Ba(N0 1 2 . with B15C5 and -DB24C8 -only MLZE species were extractedl with a negligible influence of the crown ether cavity size. No synergic extraction of copper was observed regardless of the crown ether and the aqueous electrolyte.

Incorporating Size Selectivity into Synergistic Solvent Extraction: A Review of Crown Ether-Containing Systems

“…97 A more complete investigation of aqueous phase cation effects probed Co(II) extraction from Li(I), Na(I), K(I), or Ba(II) aqueous phases into CHCl 3 solutions of B15C5, 18C6, DCH18C6, DB18C6, DCH24C8, or dibenzo-24-crown-8 (DB24C8, Figure 2) and HPMBP. 98 An examination of Co(II) partitioning into 1,2-dichloroethane, CH 2 Cl 2 , or CHCl 3 from aqueous CsCl or CsNO 3 by several 15-24-membered macrocyclic polyethers and 4-acyl-3-methyl-1-phenylpyrazol-5-ones (acyl ) benzoyl, p-tert-butylbenzoyl, stearoyl) is also reported. 99 The influence of the acyl group on the extraction of [Cs(CE) q ][Co(L) 3 ] (q ) 1-2) derives principally from changes in the pK a of the acylpyrazolone and not from the steric bulk.…”

“…A more complete investigation of aqueous phase cation effects probed Co(II) extraction from Li(I), Na(I), K(I), or Ba(II) aqueous phases into CHCl 3 solutions of B15C5, 18C6, DCH18C6, DB18C6, DCH24C8, or dibenzo-24-crown-8 (DB24C8, Figure ) and HPMBP . Partitioning of Co(II) and Cd(II) from KNO 3 was effected as the [K(CE)][M(PMBP) 3 ] ion pair by 18-membered macrocycles because both of these transition-metal cations form stable tris-PMBP - chelate complexes.…”

Crown ethers as synergistic agents in the solvent extraction of trivalent lanthanides with 8-hydroxyquinoline

“…28 However, Ho 3+ and Er 3+ were extracted with Hdcq (5,7-dichloro-8-hydroxyquinoline) as self-adducts of the type Ln(dcq) 3 ·Hdcq. 29 Moreover, in the extraction of Gd 3+ with HQ, as well as Pr 3+ , Dy 3+ and Yb 3+ with Hdcq, 30 the existence of both of the chelates (GdQ 3 or Ln(dcq) 3 ) and the self-adducts (GdQ 3 ·HQ or Ln(dcq) 3 ·Hdcq) were observed. It is further reported 31 that Nd 3+ is extracted as Nd(dbq) 3 , as are other Ln 3+ (La, Gd and Lu) as Ln(dbq) 3 into CHCl 3 .…”

Solvent Extraction of Rhenium(vii) With Crown Ethers and Some Univalent Cations

“…The different extraction behaviors between anion species and alkali picrates are discussed. (11). The AtX2-(X = C1-.…”