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Selective Anion Extraction and Recovery Using a Fe II 4 L 4 Cage
Author(s) -
Zhang Dawei,
Ronson Tanya K.,
Mosquera Jesús,
Martinez Alexandre,
Nitschke Jonathan R.
Publication year - 2018
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201800459
Subject(s) - nitromethane , chemistry , extraction (chemistry) , acetonitrile , selectivity , salt (chemistry) , solvent , cage , ethyl acetate , inorganic chemistry , solubility , ion , chromatography , nuclear chemistry , organic chemistry , catalysis , mathematics , combinatorics
Selective anion extraction is useful for the recovery and purification of valuable chemicals, and in the removal of pollutants from the environment. Here we report that Fe II 4 L 4 cage 1 is able to extract an equimolar amount of ReO 4 − , a high‐value anion and a nonradioactive surrogate of TcO 4 − , from water into nitromethane. Importantly, the extraction was efficiently performed even in the presence of 10 other common anions in water, highlighting the high selectivity of 1 for ReO 4 − . The extracted guest could be released into water as the cage disassembled in ethyl acetate, and then 1 could be recycled by switching the solvent to acetonitrile. The versatile solubility of the cage also enabled complete extraction of ReO 4 − (as the tetrabutylammonium salt) from an organic phase into water by using the sulfate salt of 1 as the extractant.