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Oxidation of solid gold was studied in chloroform solutions of cetyltrimethylammonium bromide (CTAB). We observed that, upon sonication, solid gold is oxidized and cetyltrimethylammonium tetrabromo aurate is formed. The Br − ions act as a nucleophile that lowers the reduction potential of gold and molecular oxygen from the air acts as an oxidant. Addition of hydrazine to the sonicated solution...
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