Extraction of lanthanoids(III) with several .BETA.-diketones and the formation of aqueous chelates

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  • OGA Azusa
    Department of Chemistry, Faculty of Science, Science University of Tokyo
  • YAMAOKA Kazuaki
    Department of Chemistry, Faculty of Science, Science University of Tokyo
  • ITANO Kazuyuki
    Department of Chemistry, Faculty of Science, Science University of Tokyo
  • HASEGAWA Yuko
    Department of Chemistry, Faculty of Science, Science University of Tokyo

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Other Title
  • β‐ジケトン類によるランタノイド（ＩＩＩ）の抽出と水相内キレート生成
  • β-ジケトン類によるランタノイド(III)の抽出と水相内キレート生成
  • ベータ ジケトンルイ ニ ヨル ランタノイド 3 ノ チュウシュツ ト スイソウ ナイ キレート セイセイ

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Abstract

The extraction constants represented by Kex=[LnA3]o[H+]3[Ln3 +]−3[HA]o−3 were determined across the lanthanoid series, in the extraction of lanthanoids(III) with acetylacetone (Haa), benzoylacetone (Hbza), benzoyltrifluoroacetone (Hbfa), and hexafluoroacetylacetone (Hhfa) from 0.1 mol dm−3 NaClO4 into CHCl3 at 25°C. The extraction constants increased along with increasing the lanthanoid atomic number. However, the degree of the variation of the extraction between adjacent lanthanoids decreased in the sequence of Haa—∼Hbza>Hbfa>Hhfa, i.e., the extraction constants with β -diketones, possessing a smaller number of F atoms, showed the larger variation for the lanthanoid. In addition, when the stability constants of the aqueous chelates of lanthanoids(III) with Hhfa and Haa were determined by potentiometric titration and the solvent-extraction technique, the constants of the aa chelates increased along with the atomic number, while those of the hfa chelates did not change over the series. Accordingly, it was concluded that the increase of Kex with Haa for the lanthanoid series depends on the change in the stability constants as well as the distribution constants of the extracted species, while the similar values of Kex with Hhfa across the series was contributed by similar stability constants.<br>

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 53 (11), 1199-1206, 2004

    The Japan Society for Analytical Chemistry

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