We demonstrate that a tripodal hexaurea receptor can selectively bind PO anions 12 hydrogen bonds with up to 3.8 × 10 M binding affinity in DMSO, which is 38-fold stronger than SO. This receptor facilitates the extraction of PO from strongly basic aqueous solutions into chloroform using liquid-liquid extraction, followed by its release as the HPO anion into an acidic solution. This pH-dependent phosphate extraction successfully enables selective separation of phosphate and sulfate anions.
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