Valence Selective Gold Precursor Synthesis From Electronic Waste via Programmable Coordination Chemistry.

]), representing Au(III) and Au(I) salts. The material demonstrates a gold absorption capacity of 837 mg/g and retains extraction efficiencies near 98% despite the presence of surplus competing metal ions. All gold precursors are acquired with quantitative yield and purity exceeding 99.9%, while the hydrogel maintains efficacy during numerous successive cycles. This work establishes a scalable route for transforming electronic waste into value-added gold feedstocks, advancing sustainable chemical manufacturing and circular materials design.