Compounds with Br, I, the Chalcogens (S, Se, Te, Po), B, and C

Gold-bromine chemistry is analogous to gold-chlorine chemistry: both AuI and AuIII compounds are stable. In contrast, AuI3 spontaneously decomposes to AuI and I2, and AuIII is stable only in complexes such as ÄAuI4Ü-. The ÄAu12-Se8Ü4- cluster is an example of an inorganic cryptate. The telluride AuTe2 recently attracted interest after its structure was shown to be incommensurately modulated. No stable gold carbide is known. However, much studied are gold-carbon interfaces: atoms, clusters, fullerenes such as C60 and C70, and thin films on gold surfaces. The mechanism of the adsorption of ÄAu(CN)2Ü- on activated carbon, one step in the carbon-in-pulp process of recovering gold, has been studied extensively.