Design of Highly Selective Recognition and Separation System for Metal Ions

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(1) Several bi- and tridentate ligands had been prepared, and in addition to the monodentate ligand, tri-n-octylphosphine oxide (TOPO), they were applied to the synergistic extraction of alkaline earth metals and lanthanide metals. Bis (diphenylphosphinyl) methane (BDPPM) was found to be the most powerful adduct forming ligand. The compositions of the extracted species were confirmed by a graphical method. The extraction constants were calculated on the basis of the composition of the extracted species and elucidated in terms of the molecular structure.(2) Novel 4-acyl-5-pyrazolones having the crown ether moiety as the intramolecular synergist have been synthesized and the solvent extraction of various metal ions are examined. It is expected that the crown ether moiety could behave as the intramolecular synergist and that the selectivity could be governed by the acylpyrazolone and the crown ether parts. These ligands are powerful and selective extracting reagents for alkali, alkaline earth and divalent transition metal ions, and the selectivity is quite unique depending on the intramolecular synergist.