Quantitative, room‐temperature, solvent-free mechanochemical oxidation of elemental gold into organosoluble gold salts

19 December 2022, Version 1
This content is a preprint and has not undergone peer review at the time of posting.


Gold is highly valued for its wide-ranging commercial and technological use and is currently almost exclusively processed via aggressive reaction conditions that produce water soluble salts. Oxidative mechanochemistry has previously been shown as a rapid, mild, and room-temperature alternative for chemically activating and transforming gold into water soluble species in the presence of potassium and ammonium halides. Demonstrated here is the extension of this strategy in the presence of tetraalkylammonium halides to directly and efficiently produce salts soluble in pure organic solvents and aqueous alcoholic media. This method affords gold salts that are rapidly and easily purified from byproducts using benign and easily recycled solvents and can be readily used for subsequent materials synthesis such as Au(I) salts and gold nanoparticles.


solvent-free chemistry
green chemistry

Supplementary materials

Supplementary Information
Material and methods, experimental conditions, 1H NMR spectra, HR-MS data, FT-IR spectra, details of X-ray single crystal diffraction analysis, powder X-ray diffraction analysis, and XPS data.


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