大環状配位子をイオンサイズ選択性マスキング試薬として利用した金属イオンの高選択的溶媒抽出系の設計

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  • Design of Highly Selective Solvent Extraction System of Metal Ions Utilizing Macrocyclic Ligand as Ion-size Selective Masking Reagent
  • ダイカンジョウ ハイイシ オ イオンサイズ センタクセイ マスキング シヤク ト シテ リヨウ シタ キンゾク イオン ノ コウセンタクテキ ヨウバイ チュウシュツケイ ノ セッケイ

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Improved extraction-separation could be achieved in the extraction of alkali, alkaline earth and rare earth metal ions using macrocyclic ligands as ion size selective masking reagents. By adding macrocyclic ligand to the aqueous phase in the conventional chelate extraction system, the extractions of metal ions with larger ionic radii shifted to the higher pH region. Consequently, the separation among the metal ions was enhanced. Diazapolyoxabicyclic ligands (cryptand) exhibit a prominent separation ability for alkali and alkaline earths metal ions. Quantitative separation systems have been successfully developed in the synergistic extraction of alkali and alkaline earth metal ions in the presence of cryptand. A new type of water-soluble sulfonated crownethers have been prepared. The extractive separability of lanthanide ions was found to improve by adding the sulfonated crown ethers into the aqueous phase. The number of water molecules in the first coordination sphere of the central Eu3+ in the complex was determined by a laser-induced luminescence study. In addition, fluorescence spectra were measured to evaluate the structure of the complexes. The stabilization of the complexes formed is discussed taking into account an outer-sphere electrostatic attraction between the sulfonic acid group and the metal ion.

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