Comparing extraction, synergism and separation of lanthanoids using acidic and neutral compounds in chloroform and one ionic liquid: is the latter always “better”?

摘要: The complexation properties of a pyrazolone derivative, 3-methyl-1-phenyl-4-(4-trifluoromethylbenzoyl)-pyrazol-5-one (HL), in chloroform were examined and it was found that possesses improved ability comparison with 4-benzoyl, 4-(4-methylbenzoyl) 4-(4-fluorobenzoyl) derivatives. Mixed ligand chelate extractions trivalent lanthanoids (La, Nd, Eu, Ho Lu) HL 5,11,17,23-tetra-tert-butyl-25,26,27-tris(dimethylphosphinoylpropoxy)-28-hydroxy-calix[4]arene (S1) or 5,11,17,23-tetra-tert-butyl-25,27-bis(dimethylphosphinoylpropoxy)-26,28-dihydroxy-calix[4]arene (S2) as synergistic agents also carried out chloride medium at constant ionic strength μ = 0.1 CHCl3 organic phase. interactions between the extractants deuterochloroform studied by 1H, 13C, 31P NMR. composition extracted species established LnL3·HL (L− represents anion) single extractant, LnL3·S presence phosphorus-containing calix[4]arene. On basis experimental data, values equilibrium constants calculated. influence number PO groups tert-butyl-calix[4]arene on extraction process discussed. enhancement separation factors metals evaluated. Finally, La(III) Eu(III) ions performed using an liquid, 1-butyl-3-methylimidazolium-bis(trifluoromethanesulfonyl)imide, solvent varying type ligands. By to CHCl3, liquid offers increased distribution ratios, expense levelling off factors. Reasons for such phenomenon are