Aurous cyanide

Some of the single cyanides, as potassic cyanide, are readily decomposed by acids others, os ferrous and aurous cyanides, may be boiled with moderately strong acids without decom position. 

Aurous cyanide, AuCN.—The cyanide is produced by the interaction of hydrogen cyanide and auric hydroxide8 by double decomposition... 

Aurous cyanide forms yellow, microscopic laminae, very slightly soluble in Water. It is more stable than aurous iodide, but at red heat is decomposed into gold and cyanogen. Its insolubility renders it immune to the action of dilute acids and hydrogen sulphide, but solutions of ammonia, potassium hydroxide, ammonium sulphide, and sodium thiosulphate dissolve it, probably forming complex derivatives. In aurous cyanide the tendency to form complex compounds is much more marked than in the corresponding chloride, bromide, and iodide.3 Its interaction with potassium ferrocyanide has been studied by Beutel.4... 

Double decomposition of ammonium sulphate and potassium aurocyanide yields ammonium aurocyanide, NH4Au(CN)2. This substance begins to decompose at 100° C. into aurous cyanide, hydrogen cyanide, and ammonia.7 Sodium aurocyanide, NaAu(CN)2, resembles the corresponding potassium salt in both preparation and properties. Salts of the aurocyanic radical, Au(CN)2, with other metals are also known.8 The compound HAu(CN)2 has not been isolated, since it decomposes readily with production of hydrogen cyanide. 

Metallurgy of gold. Aurous chloride, aurous bromide, aurous iodide, potassium aurous cyanide, auric chloride, hydrogen aurichloride. 

Aurous Cyanide Barium Chloride Polyamide, Nylon 2... 

Gold(i) Complexes. There are several aurous complexes stable in aqueous solution, the most important ones being Au(CN)J, AuCl2 and the thiosulfate species. The cyanide complex is very stable (K — 4x 1028) and is formed when AuCN is treated with an excess of cyanide or, more usually, when gold is treated with an alkali cyanide in presence of air or hydrogen peroxide. Crystalline compounds such as K[Au(CN)2] can be obtained, and the free acid, HAu(CN)2, is isolable by evaporation of its solutions as in other free cy ano acids, a hydrogen-bonded lattice with —CN—H—N C— bonds is formed. 

Aurous acetylide does not form when passing acetylene through an aqueous solution of auric chloride. Instead metallic gold precipitates. Precipitation does not occur when introducing acetylene into a solution of auric chloride alkalized by potassium hydroxide nor into aqueous or ammoniacal solutions of potassium auric cyanide [67]. Unwanted formation of aurous acetylide has been reported during preparation of some alkynylgold(I) complexes [68]. 

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