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A new type of water-soluble sulfonated crown ether has been prepared and utilized as an ion size selective masking reagent with a view to establishing a highly selective extraction-separation system. In the synergistic extraction of alkaline earths with 4-benzoyl-3-methyl-1-phenyl-5-pyrazolone and trioctylphosphine oxide in cyclohexane, the extraction of these with larger ionic radii shifted to a higher pH region on adding the sulfonated crown ether to the aqueous phase, giving improved separations. A similar result was achieved in the extraction of lanthanides into cyclohexane with bis(2-ethylhexyl)phosphoric acid. The complex formation of alkaline earth and lanthanide ions with the sulfonated crown ethers in the aqueous solution were evaluated via the solvent extraction method.

Complex Formation of Metal Ions with Sulfonated Crown Ethers in Water as Ion Size Selective Masking Reagents.