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構成アニオンの側鎖長が異なるイオン液体への三価ランタノイドの抽出

Extraction of trivalent lanthanoids into ionic liquids having different side chain lengths in anions

江口 綾乃 ; 岡村 浩之   ; 杉田 剛   ; 上田 祐生   ; 森田 耕太郎*; 下条 晃司郎   ; 長縄 弘親  ; 平山 直紀*

Eguchi, Ayano; Okamura, Hiroyuki; Sugita, Tsuyoshi; Ueda, Yuki; Morita, Kotaro*; Shimojo, Kojiro; Naganawa, Hirochika; Hirayama, Naoki*

本研究では、抽出溶媒としてイオン液体(IL)アニオンのパーフルオロアルキル(Rf)基の炭素数が異なる4種類(n =1-4)のILを合成し、ILキレート抽出へのILアニオンのRf鎖長の効果を検討した。キレート抽出剤、2-テノイルトリフルオロアセトンによる三価ランタノイドイオン(Ln(III)=La, Nd, Eu, Dy, Lu)の抽出を調べたところ、Rf鎖長nの偶奇によって抽出錯体が異なることが明らかとなった。

In this study, the effect of the perfluoroalkyl (Rf) chain length of the ionic liquid (IL) anion on the IL chelate extraction was investigated. Four 1-butyl-3-methylimidazolium bis(perfluoroalkanesulfonyl)imides with different Rf chain length (n = 1 - 4) were synthesized and used as extraction solvents. Herein, the extraction of trivalent lanthanoids (Ln(III) = La, Nd, Eu, Dy and Lu) with an extractant, 2-thenoyltrifluoroacetone, was studied. It was revealed that the extracted complex depends on even or odd number of the Rf chain length n.

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