高等学校化学学报

高等学校化学学报 ›› 1999, Vol. 20 ›› Issue (S1): 203.

• Chromatography and Separation Sciences • 上一篇    下一篇

Thermodynamic and Spectroscopic Study of the Adduct Formation of Tris(β-diketonato)lanthanoids with Heteroamines

Takashi Ito, Kiyotaka Nakaya, Natsumi Ugawa, Yuko Hasegawa   

  1. Department of Chemistry, Science University of Tokyo, Tokyo, 162-8601, Japan
  • 出版日期:1999-12-31 发布日期:1999-12-31

Thermodynamic and Spectroscopic Study of the Adduct Formation of Tris(β-diketonato)lanthanoids with Heteroamines

Takashi Ito, Kiyotaka Nakaya, Natsumi Ugawa, Yuko Hasegawa   

  1. Department of Chemistry, Science University of Tokyo, Tokyo, 162-8601, Japan
  • Online:1999-12-31 Published:1999-12-31

PDF (PC)

摘要：

A remarkable enhancement of the extraction of lanthanoids(Ⅲ)(Ln) with β-diketones in the presence of a Lewis base, so-called synergistic effects, would be caused by the adduct formation of the β-diketonates with the Lewis base. The trend of the variation of the adduct formation constants across the lanthanoid series may be different among β-diketones used. It has also been observed that the trend across lanthanoid series and also the values of the enthalpy change in the adduct formation of the 2-thenoyltrifluoroacetonates(TTA) with 1,10-phenanthroline(phen) are very similar to those with 2,25-bipyridyl(bpy), although the values of the adduct formation constants with the former are larger than those with the latter.

Abstract:

A remarkable enhancement of the extraction of lanthanoids(Ⅲ)(Ln) with β-diketones in the presence of a Lewis base, so-called synergistic effects, would be caused by the adduct formation of the β-diketonates with the Lewis base. The trend of the variation of the adduct formation constants across the lanthanoid series may be different among β-diketones used. It has also been observed that the trend across lanthanoid series and also the values of the enthalpy change in the adduct formation of the 2-thenoyltrifluoroacetonates(TTA) with 1,10-phenanthroline(phen) are very similar to those with 2,25-bipyridyl(bpy), although the values of the adduct formation constants with the former are larger than those with the latter.

TrendMD: