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Calix[4]arene diglycolamic acid derivative; Application to lanthanide extraction

Shimojo, Kojiro   ; Yabe, Makoto*; Sugita, Tsuyoshi   ; Okamura, Hiroyuki   ; Ohashi, Akira*; Naganawa, Hirochika  

Solvent extraction is an effective method for the separation and purification of metal ions. The extractant plays a key role in the extraction efficiency and the separation operation. In this study, we have synthesized calix[4]arene diglycolamic acid derivative as a novel extractant and have investigated extraction behavior of lanthanide ions. It was found that the pre-organization of four diglycolamic acid groups in the cyclic structure can improve remarkably extraction performance and separation ability for lanthanide ions.

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