Abstract
ABSTRACT With the aim of improving our knowledge about the extraction of indium from perchlorate media, by 1-phenyl-3-methyl-4-acyl-pyrazol-5-ols, "HL" (HPMBP: acyl = benzoyl, HPMTP: acyl= thenoyl) and their mixtures with tri-n-octylphosphine oxide, "T0P0", in toluene, synthetic and extraction organic phases, and extractable complexes, have been studied by phosphorus-31 and proton NMR, and IR spectroscopy. NMR measurements show that the reaction generally assumed to describe the synergistic effect, does not occur in homogeneous organic phases, which implies an interfacial mechanism for the synergistic extraction. In the extracted complexes, L- behave in all cases as a bidentate ligand. However, while the three chelate rings of In L3 (H2O) are identical, there are only two chelate rings in InL3 (TOPO) 2, the bond of the third acylpyrazololato
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