Extraction behavior of trivalent metals in ionic liquid chelate extraction using bidentate ligands

Eguchi, Ayano ; Morita, Kotaro*; Okamura, Hiroyuki ; Hirayama, Naoki*

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 ([C $_{n}$ mim][Tf $_{2}$ N], n = 2, 4, 8) using 8-quinolinol (H $^{+}$ Q $^{-}$ ) and 2-mercaptopyridine -oxide (H $^{+}$ SPyO $^{-}$ ) as bidentate ligands. In the case of H $^{+}$ Q $^{-}$ , only uncharged M $^{3+}$ Q $_{3}$ $^{3-}$ was extracted into chloroform, whereas coordinatively unsaturated cationic complex [M $^{3+}$ Q $_{2}$ $^{2-}$ ] $^{+}$ was also extracted into ILs by ion exchange. In the case of H $^{+}$ SPyO $^{-}$ , it was implied that uncharged M $^{3+}$ (SPyO) $_{3}$ $^{3-}$ was extracted into both chloroform and ILs. Therefore, the extracted species depends on the ligands in ILs.

Language	:	English
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Meeting title	:	RSC Tokyo International Conference 2017
Held date	:	2017/09
Location (city)	:	Chiba
Location (country)	:	Japan
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Cooperating Institute	:	東邦大学

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Registration No. : BB20171134
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