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Haraga, Tomoko; Sato, Yoshiyuki; Ouchi, Kazuki; Shibukawa, Masami*; Ishimori, Kenichiro; Kameo, Yutaka; Saito, Shingo*
no journal, ,
no abstracts in English
Asai, Shiho; Ohata, Masaki*; Yomogida, Takumi; Saeki, Morihisa*; Oba, Hironori*; Hanzawa, Yukiko; Horita, Takuma; Kitatsuji, Yoshihiro
no journal, ,
Eguchi, Ayano; Morita, Kotaro*; Okamura, Hiroyuki; Hirayama, Naoki*
no journal, ,
In chelate extraction of metal ions into conventional organic solvents, the metals are generally extracted as uncharged complexes. Moreover, coordinatively saturated (unhydrated) complexes are preferable as extracted species. In ionic liquid (IL) chelate extraction, on the contrary, also charged species or coordinatively unsaturated (hydrated) species can be extracted. In this study, we investigated the IL chelate extraction behavior of trivalent metal ions, Fe(III), Al(III), Ga(III) and In(III), into 1-alkyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imides ([Cmim][TfN], n = 2, 4, 8) using 8-quinolinol (HQ) and 2-mercaptopyridine -oxide (HSPyO) as bidentate ligands. In the case of HQ, only uncharged MQ was extracted into chloroform, whereas coordinatively unsaturated cationic complex [MQ] was also extracted into ILs by ion exchange. In the case of HSPyO, it was implied that uncharged M(SPyO) was extracted into both chloroform and ILs. Therefore, the extracted species depends on the ligands in ILs.