Selective Anion Extraction and Recovery Using a Fe II 4 L 4 Cage

Dawei Zhang (1) , Tanya K. Ronson (1) , Jesús Mosquera (1) , Alexandre Martinez (2) , Jonathan R. Nitschke (1)

1 CAM - University of Cambridge [UK]
2 ISM2 - Institut des Sciences Moléculaires de Marseille

Selective anion extraction is useful for the recovery and purification of valuable chemicals,a nd 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 À ,ahigh-value anion and an onradioactive surrogate of TcO 4 À ,f rom water into nitromethane.I mportantly,t he extraction was efficiently performed even in the presence of 10 other common anions in water,h ighlighting the high selectivity of 1 for ReO 4 À .The extracted guest could be released into water as the cage disassembled in ethyl acetate,a nd then 1 could be recycled by switching the solvent to acetonitrile.T he versatile solubility of the cage also enabled complete extraction of ReO 4 À (as the tetrabutylammonium salt) from an organic phase into water by using the sulfate salt of 1 as the extractant.

Domaines: Chimie

Dawei Zhang, Tanya K. Ronson, Jesús Mosquera, Alexandre Martinez, Jonathan R. Nitschke. Selective Anion Extraction and Recovery Using a Fe II 4 L 4 Cage. Angewandte Chemie International Edition, 2018, 57 (14), pp.3717-3721. ⟨10.1002/anie.201800459⟩. ⟨hal-02091951⟩