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Fully chelating N$$_{3}$$O$$_{2}$$-pentadentate planar ligands designed for the strongest and selective capture of uranium from seawater

海水ウランに対する強い選択性を有する平面五座N$$_{3}$$O$$_{2}$$配位子の設計

水町 匠*; 佐藤 みなみ*; 金子 政志   ; 竹山 知志*; 津島 悟*; 鷹尾 康一朗*

Mizumachi, Takumi*; Sato, Minami*; Kaneko, Masashi; Takeyama, Tomoyuki*; Tsushima, Satoru*; Takao, Koichiro*

海水中のウランに対して強力かつ選択的に錯体を生成する平面五座配位子H$$_{2}$$saldian及びその誘導体を開発した。模擬海水条件において、saldian$$^{2-}$$はウランに対して非常に高い安定度定数を示し、従来開発されてきたアミドキシム型配位子よりも10桁以上の錯生成能を達成した。海水中に存在する他の夾雑イオンに対するウランの選択性についても、良好な結果が得られた。

Based on unique 5-fold equatorial coordination of UO$$_{2}$$$$^{2+}$$, water-compatible pentadentate planar ligands, H$$_{2}$$saldian and its derivatives, were designed as strong and selective capture of UO$$_{2}$$$$^{2+}$$ in seawater. In the simulated seawater condition (0.5 M NaCl + 2.3 mM HCO$$_{3}$$$$^{-}$$/CO$$_{3}$$$$^{2-}$$, pH 8), saldian$$^{2-}$$ shows the strongest complexation with UO$$_{2}$$$$^{2+}$$ to form UO$$_{2}$$(saldian) (log$$beta$$$$_{11}$$ = 28.05 $$pm$$ 0.07), which is more than 10 order of magnitude greater than amidoxime-based or -inspired ligand systems most commonly employed for U capture from seawater. Good selectivity for UO$$_{2}$$$$^{2+}$$ from other metal ions coexisting in seawater was also demonstrated.

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パーセンタイル:36.89

分野:Chemistry, Inorganic & Nuclear

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