Specific cooperative effect of a macrocyclic receptor for metal ion transfer into an ionic liquid

イオン液体への金属イオン抽出における大環状レセプターの特異的協同効果

岡村浩之 ; 池田篤史* ; 斉藤拓巳*; 青柳登 ; 長縄弘親 ; 平山直紀*; 梅谷重夫*; 井村久則*; 下条晃司郎

Okamura, Hiroyuki; Ikeda, Atsushi*; Saito, Takumi*; Aoyagi, Noboru; Naganawa, Hirochika; Hirayama, Naoki*; Umetani, Shigeo*; Imura, Hisanori*; Shimojo, Kojiro

An intramolecular cooperative extraction system for the removal of strontium cations (Sr $^{2+}$ ) from water by use of a novel macrocyclic receptor (H $_{2}$ DA18C6) composed of diaza-18-crown-6 and two -diketone fragments in ionic liquid (IL) is reported, together with X-ray spectroscopic characterization of the resulting extracted complexes in the IL and chloroform phases. The covalent attachment of two -diketone fragments to a diazacrown ether resulted in a cooperative interaction within the receptor for Sr $^{2+}$ transfer, which remarkably enhanced the efficiency of Sr $^{2+}$ transfer relative to a mixed -diketone and diazacrown system. The intramolecular cooperative effect was observed only in the IL extraction system, providing a 500-fold increase in extraction performance for Sr $^{2+}$ over chloroform. Slope analysis and potentiometric titration confirmed that identical extraction mechanisms operated in both the IL and chloroform systems. Extended X-ray absorption fine structure spectroscopy revealed that the average distance between Sr $^{2+}$ and O atoms in the Sr $^{2+}$ complex was shorter in IL than in chloroform. Consequently, Sr $^{2+}$ was held by H $_{2}$ DA18C6 more rigidly in IL than in chloroform, representing an important factor dominating the magnitude of the intramolecular cooperative effect of H $_{2}$ DA18C6 for Sr $^{2+}$ .

使用言語	:	English
掲載資料名	:	Analytical Chemistry
巻	:	84
号	:	21
ページ数	:	p.9332 - 9339
発行年月	:	2012/11
発表会議名	:
開催年月	:
開催都市	:
開催国	:
キーワード	:	no keyword

特許データ	:
PDF	:

論文URL	:	https://doi.org/10.1021/ac302015h
研究データの公開先DOI	:
使用施設	:
広報プレスリリース	:
論文解説記事 (成果普及情報誌)	:	大環状化合物を使ってストロンチウムを抽出除去; イオン液体溶媒の利用による抽出能向上を発見[/]
受委託・共同研究相手機関	:	金沢大学

Access	:	- Accesses
Web of Science® Times Cited Count	:	被引用回数：評価・統計等のため最新の被引用回数を確認したい場合は、直接Web of Science®をご確認ください。 http://www.webofknowledge.com/wos
InCites™	:	パーセンタイル：62.46 分野：Chemistry, Analytical
Altmetrics	:

登録番号 : AA20120704
抄録集掲載番号 : 41000015
論文投稿番号 : 11567

[CLARIVATE ANALYTICS], [WEB OF SCIENCE], [HIGHLY CITED PAPER & CUP LOGO] and [HOT PAPER & FIRE LOGO] are trademarks of Clarivate Analytics, and/or its affiliated company or companies, and used herein by permission and/or license.