Extraction of iridium(<scp>iv</scp>) from aqueous solutions using hydrophilic/hydrophobic ionic liquids

Abstract

Removal of iridium(<sc>iv</sc>) using hydrophilic or hydrophobic ionic liquids was studied. IrCl₆²⁻anionic metal complexes were precipitated out from water using bromide-based ionic liquids, yielding water-insoluble salts with low<italic>K</italic>_svalues. Liquid–liquid extraction of Ir(<sc>iv</sc>) using [NTf₂]-based ionic liquids yielded distribution coefficients up to 70 with [OMIM][NTf₂] at pH 2.