Extraction enhancement effect of hydrogen-bond donors in chelate extraction systems.

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Other Title
  • キレート抽出系における水素結合供与体の抽出増大効果
  • キレート チュウシュツケイ ニ オケル スイソ ケツゴウ キョウヨタイ ノ チ
  • キレート抽出系における水素結合供与体の抽出増大効果(関東支部創立40周年記念)

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Abstract

Effect of phenols as organic hydrogen-bond donors on the chelate extraction of metal ions was thoroughly investigated. A remarkable enhancement of extractability was found in various chelate extraction systems in the presence of phenols. The selectivity of the effect is quite different from the conventional synergistic effect of neutral electron donors such as tributyl phosphate. From spectroscopic measurements, this effect was ascribed to the association of extracted chelates with phenols through hydrogen bonding in the organic phase. Compositions of the association complexes formed, their stability constants (association constants) and thermodynamic parameters were systematically determined from analysis of the extraction equilibria. On the basis of the association constants obtained, factors governing the hydrogen-bond acceptor ability of metal chelates were elucidated. In this study, an important contribution of hydrogen bonding to chelate extraction was clearly demonstrated.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 44 (12), 1001-1012, 1995

    The Japan Society for Analytical Chemistry

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