Laser-induced fluorescence and infrared spectroscopic studies on the specific solvation of tris(1-(2-thienyl)-4,4,4-trifluoro-1,3-butanedionato)europium(III) in an ionic liquid

Okamura, Hiroyuki ; Sakae, Hiroki*; Kidani, Keiji*; Hirayama, Naoki*; Aoyagi, Noboru ; Saito, Takumi*; Shimojo, Kojiro ; Naganawa, Hirochika ; Imura, Hisanori*

The extraction constant and the two-phase stability constant of tris(2-thenoyltrifluoroacetonato) europium(III) between 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide ([C $_{4}$ mim][Tf $_{2}$ N]) as an ionic liquid and an aqueous phase were determined by considering the extraction equilibria. Specific solute-solvent interactions between the neutral Eu(III) chelate and [C $_{4}$ mim][Tf $_{2}$ N] molecules were revealed from the relationships between the distribution constant of the enol form of 2-thenoyltrifluoroacetone (Htta) and the distribution constant ( $_{rm D,M}$ ) of the neutral Eu(III) chelate. The coordination environment of Eu $^{3+}$ in the neutral Eu(III) chelate in [C $_{4}$ mim][Tf $_{2}$ N] was investigated by time-resolved laser-induced fluorescence spectroscopy and infrared absorption spectroscopy. Both methods consistently indicated that not only the Eu(III)chelate extracted but also Eu(tta) $_{3}$ (H $_{2}$ O) $_{3}$ synthesized as a solid crystal were almost completely dehydrated in [C $_{4}$ mim][Tf $_{2}$ N] saturated with water. Consequently, the higher $_{rm D,M}$ or extractability of the neutral Eu(III) chelate in the [C $_{4}$ mim][Tf $_{2}$ N] system can be ascribed to the dehydration of the Eu(III) chelate, which is caused by the specific solvation with [C $_{4}$ mim][Tf $_{2}$ N] molecules.

Language	:	English
Journal	:	Polyhedron
Volume	:	31
Number	:	1
Pages	:	p.748 - 753
Publication Year/Month	:	2012/01
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Paper URL	:	https://doi.org/10.1016/j.poly.2011.10.031
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Keywords	:	no keyword
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Cooperating Institute	:	金沢大学

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Registration No. : AA20111070
JAEA Abstracts No. : 40000612
Paper Submission No. : 10524

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