506-65-0 gold cyanide

Cyan-essigsaure, /. cyanoacetic acid, -gas, n. cyanogen gas. -gold, n. gold cyanide, -gold-kalium, n. potassium auri- or aurocyanide, potassium cyanoaurate. 

Although 6 Is most prevalent, a coordination number of 4 Is also common, and several important complexes have a coordination number of 2. In addition, a few complexes display coordination numbers of 3, 5, and 7. Examples of coordination number 2 include the silver-ammonia complex and the gold-cyanide complex, both described in Chapter 18. To minimize ligand-ligand repulsions, a complex with a coordination number of 2 is invariably linear, as Figure 20-6 shows. 

Hakala, M. and Pyykkd, P. (2006) Gold as intermolecular glue a predicted triaurotriazine, C3AU3N3, isomer of gold cyanide. Chemical Communications, (27), 2890-2892. 

Lapidus, G. Unsteady-state model for gold cyanidation on a rotating disk. Hydrometallurgy 1995, 39, 251-263. 

Kumar, A. Haddad, R. Benzal, G. Sastre, A. M. Dispersion-free solvent extraction and stripping of gold cyanide with LIX79 using hollow fiber contactors Optimization and modeling. Ind. Eng. Chem. Res. 2002, 41, 613-623. 

As in previous volumes,1 2 the solution chemistry of gold cyanides as well as the solid-state chemistry of binary and polynary gold cyanides and carbides have been excluded from this review. 

In the elucidation of the X-ray structure of hCP by the method of isomorphous replacement, gold and mercury heavy atom derivatives were utilized. In the case of the mercury derivative, p-chloromercury-benzoate, the heavy atom bound to the free sulphydryl residue, C221, but for the gold cyanide derivative the gold atom was found to bind in the vicinity of the trinuclear copper cluster. A realistic explanation of this... 

Merrill-Crowe An improvement on the cyanide process for extracting gold from rock. The solution of gold cyanide is reduced with zinc dust, thereby precipitating the gold as a fine powder which is filtered off and smelted. Operated in South Africa. 

Morphology of gold nanoparticles synthesised from gold chloride and gold cyanide complexes under evaporative conditions... 

No modification is observed in the dimensionality compared with that of the parent gold cyanide complex, but an increment in the thermal stability is described in the final compound. In the structure of [Cu(tmeda)][Au(CN)2]2 (tmeda = N,N,N, N -tetramethylenediamine) aurophilic interactions connect ID chains which contain copper(II)-bridging and pendant [Au(CN)2] units. In this case the aurophilic interactions increase the structural dimensionality from one to three. The compound is synthesized by reaction of Cu(C104)2.6H20, tmeda (tetramethylethylenediamine) and K[Au(CN)2]. The structure of Au2Cu(CN)4(tacn)] (tarn = 1,4,7- triazacyclono-nane) contains two different sort of chains. One of them contains gold atoms in an ABCDABCD- pattern (Figure 2.16a), and the other is built from two kinds of... 

Manganous acetylacetonate Manganic acetylacetonate Ferrous acetylacetonate Ferric acetylacetonate Cobaltic acetylacetonate Rhodium chloride Nickel acetylacetonate Potassium platinous chloride Tetrammine copper (II) sulfate Potassium gold cyanide... 

The resins can absorb approximately 25 - 30 g of gold cyanide for each liter of resin per regeneration cycle. It should be underlined that the FTS Distillation unit does not destroy the cyanide ions, but reduces their volume as far as possible. This gives the following advantages ... 

An example of chemical destruction of an anionic species is the elution of aurocyanide from an anion-exchange resin with thiourea, a neutral ligand that reacts with gold cyanide in the presence of acid to form a cationic complex. The elution reaction can be described by the following equation ... 

Far less selectivity can be achieved in cyanide solution because many metals, both precious and base, form anionic complexes in even very dilute cyanide solution. This is illustrated by the equilibrium absorption isotherms for various metal ions in a leach liquor from a gold cyanidation plant on a strong-base resin (Figure 14).358... 

Magnesium reacts with incandescence on heating with cadmium cyanide, cobalt cyanide, copper cyanide, lead cyanide, nickel cyanide and zinc cyanide. With gold cyanide or mercury cyanide, the cyanogen released by thermal decomposition of these salts reacts explosively with magnesium. 

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