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Precipitation processes are increasingly popular and are reliant on designing and understanding chemical recognition to achieve selectivity. Here we show that a simple tertiary diamide precipitates gold selectively from aqueous acidic solutions, including from aqua regia solutions of electronic waste. The X-ray crystal structure of the precipitate displays an infinite chain of diamide cations interleaved with tetrachloridoaurate. Gold is released from the precipitate on contact with water, enabling ligand recycling. The diamide is highly selective, with its addition to 29 metals in 2\u2009M HCl resulting in 70% gold uptake and minimal removal of other metals. At 6\u2009M HCl, complete collection of gold, iron, tin, and platinum occurs, demonstrating that adaptable selective metal precipitation is controlled by just one variable. This discovery could be exploited in metal refining and recycling processes due to its tuneable selectivity under different leaching conditions, the avoidance of organic solvents inherent to biphasic extraction, and the straightforward recycling of the precipitant.<\/jats:p>","DOI":"10.1038\/s41467-021-26563-7","type":"journal-article","created":{"date-parts":[[2021,10,29]],"date-time":"2021-10-29T10:02:46Z","timestamp":1635501766000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":122,"title":["Tuneable separation of gold by selective precipitation using a simple and recyclable diamide"],"prefix":"10.1038","volume":"12","author":[{"given":"Luke M. 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