Aqueous chemistry, gold compound

Alkene complexes Alkynyl complexes Ammine complexes Aqueous chemistry Arsine complexes Auranofin Auride ion Aurophilicity Binary compounds Bond lengths acetylacetonate complex alkyls and aryls ammine complexes carboxylates cyanide complexes dialkyl sulphide complexes dithiocarbamates to gold... 

Compounds in oxidation states —I through V are known. The conunon and stable oxidation states that dominate the aqueous chemistry of gold are Au(I) and Au(III). The aquated ions are unstable to reduction, but many complexes are stabihzed by a variety of soft hgands. The remaining oxidation states (—1, II, IV, V) exhibit interesting chemical and physicochemical properties, but have not yet found medicinal applications. 

Other complexes with tetraaza macrocycles have been prepared by reaction of [Au(en)2]Cl3, ethylenediamine, or nitroethane and formaldehyde, although with nitroethane an acyclic ligand was also obtained (293).1715,1716 A gold(III) complex with a hexaaza macrocycle (1,8-dimethyl-1,3,6,8,10,13-hexaazacyclotetradecane) has been obtained by a transmetallation reaction from the nickel compound [NiL]2+ by reaction with [AuC14], 1717 The chemistry of tetraazamacrocycles in aqueous solution has been reported.1718... 

The chemistry of gold is complex. Gold can exist in seven oxidation states -1,0, - -1, -1-2, +3, +4, and - -5. Apart fromAu in the colloidal and elemental forms, only Au+ and Au+ are known to form compounds that are stable in aqueous media and important in medical applications. The remaining oxidation states of -1, +2, +4, and +5 are not presently known to play a role in biochemical processes related to therapeutic uses of gold. Neither Au+ or Au+ forms a stable aquated ion ([Au(OH2)+ ] or [Au(OH2)4 ], respectively)... 

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