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To determine which of the two known gold sulfides (containing either mono- or trivalent gold) are formed by reacting trivalent gold with differnt allotropes of sulfur, experiments were made using three different sources of sulfur. When trivalent gold in the form of Au 2 (SO 4 ) 3  in concentrated acid is reacted with electrolytically formed short-chain sulfur, monovalent gold sulfide (Au 2 S) is formed. If hydrogen sulfide gas reacts with the same solution, trivalent gold sulfide (Au 2 S 3 ) is produced. Alternatively, if ordinary a-sulfur (ring structure) is used, a 50/50 mixture of Au 2 S and Au 2 S 3  is formed. The synthesis procedure for the two gold sulfides is substantially simpler than previously reported methods of preparation

Synthesis of Au 2 S and Au 2 S 3 Using H 2 S, Short-Chain and Ring-Structured Sulfur as Sulfur Sources