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Extraction and complexation studies of N-methyl-N-phenyl-2-(1H-benzimidazol-2-yl)pyridine-6-carboxamide with trivalent lanthanide

Akutsu, Kazuhiro*; Suzuki, Shinichi; Kobayashi, Toru ; Shiwaku, Hideaki   ; Okamoto, Yoshihiro  ; Yaita, Tsuyoshi

The extractability and complexation properties of trivalent lanthanides with N-methyl-N-phenyl-2-(1H-benzimidazol-2-yl)pyridine-6-carboxamide (MePhBIZA) were investigated. The MePhBIZA, containing two aza-aromatic donors and an oxygen donor in the molecule, was designed with regard to 2-(2-pyridyl)benzimidazole (Biz) and newly synthesized as an extractant for trivalent lanthanides, Ln$$^{3+}$$, and actinides, An$$^{3+}$$. The MePhBIZA exhibited satisfactory extractability of Eu$$^{3+}$$ even under acidic conditions. A speciation diagram, based on the formation constants determined by spectroscopic titration experiments, indicated that the MePhBIZA formed complexes with Eu$$^{3+}$$ in acidic solution. These results showed that the addition of the amide group promotes ligand coordination with Eu$$^{3+}$$ over the competing protonation reaction in relatively acidic solution in comparison with Biz.

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