Ammonium tetrachloroaurate is an inorganic chemical compound with the chemical formula .
Synthesis Ammonium tetrachloroaurate can be obtained by reacting a saturated solution of gold(III) chloride with ammonium chloride in hydrochloric acid.
Physical properties The compound is slightly soluble in water and ethanol. It forms hydrates.
Ammonium tetrachloroaurate forms orange-yellow crystals. The hydrate has a monoclinic crystal structure with the space group C 2/ c (space group no. 15).
Ammonium tetrachloroaurate decomposes in air at temperatures from 230 to 350 °C . The decomposition reaction is endothermic.
Uses The hydrate is used to prepare Pd-Au alloy films.
Ammonium tetrachloroaurate can be used to produce gold nanoparticles.
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