Several factors influencing the stability of extracted species in synergistic extraction of lanthanide(3) with pivaloyltrifluoroacetone and 2,2'-bipyridyl

SAITO Tadahisa, SATO Kazuaki, MIRATSU Mitsunobu, MATSUBAYASHI Izuru, INOUE Masayuki, HASEGAWA Yuko

doi:10.2116/analsci.26.1187

Several factors influencing the stability of extracted species in synergistic extraction of lanthanide(3) with pivaloyltrifluoroacetone and 2,2'-bipyridyl

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SAITO Tadahisa

Department of Chemistry, Faculty of Science, Science University of Tokyo
SATO Kazuaki

Department of Chemistry, Faculty of Science, Science University of Tokyo
MIRATSU Mitsunobu

Department of Chemistry, Faculty of Science, Science University of Tokyo
MATSUBAYASHI Izuru

Department of Chemistry, Faculty of Science, Science University of Tokyo
INOUE Masayuki

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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タイトル別名

Several Factors Influencing the Stability of Extracted Species in Synergistic Extraction of Lanthanide(III) with Pivaloyltrifluoroacetone and 2,2'-Bipyridyl
Several Factors Influencing the Stability of Extracted Species in Synergistic Extraction of Lanthanide(III) with Pivaloyltrifluoro acetone and 2,2′-Bipyridyl

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The stability constants and the hydration number of a complex between tris(pivaloyltrifluoroacetonato)lanthanide(III) (LnA₃) and 2,2′-bipyridyl (B), LnA₃B, and the complexation heat were determined across the Ln series by a solvent-extraction technique, Karl Fischer coulometry, and calorimetry, successively. The number of water molecules released from LnA₃ upon the complexation with B as well as the values of the stability constant increased along with increasing Ln atomic number to around Dy(III); via a maximum, it decreased. It is concluded that the largest stability constant of the complex of Ho(III) or this vicinity is derived from the strongest bond energy, due to the fitness between LnA₃ and B. This conclusion was supported by the trend of the variation of the entropy change as well as that of the hydration number across the Ln series.