Intramolecular cooperative effect of a macrocyclic receptor bearing -diketone fragments on the extraction of strontium into an ionic liquid

Okamura, Hiroyuki ; Naganawa, Hirochika ; Imura, Hisanori*; Shimojo, Kojiro

The macrocyclic receptor (H $_{2}$ DA18C6) composed of diaza-18-crown-6 and two molecules of 4-acyl-5-pyrazolone was synthesized for the extraction of Sr(II) into ionic liquids (ILs). The extraction performance of H $_{2}$ DA18C6 in 1-alkyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide ([C $_{n}$ mim][Tf $_{2}$ N]) was remarkably enhanced by the intramolecular cooperative effect compared with that in chloroform. From the equilibrium analysis, the neutral complex, Sr(DA18C6), was extracted into [C $_{2}$ mim][Tf $_{2}$ N]. The shortening of the average Sr-O distance in the Sr-DA18C6 complex in the IL was revealed from the extended X-ray absorption fine structure spectroscopy. This is the cause of the intramolecular cooperative effect in the IL.

Language	:	English
Journal	:	Proceedings of 20th International Solvent Extraction Conference (ISEC 2014)
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Pages	:	p.1046 - 1051
Publication Year/Month	:	2014/09
Meeting title	:	20th International Solvent Extraction Conference (ISEC 2014)
Held date	:	2014/09
Location (city)	:	Wrlzburg
Location (country)	:	Germany
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Keywords	:	福島第一原子力発電所事故; Fukushima Daiichi Nuclear Power Station Accident
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Article of JAEA R&D Review	:
Cooperating Institute	:	金沢大学

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Registration No. : BB20141065
JAEA Abstracts No. : 43000298
Paper Submission No. : 15421

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