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Gold compounds are compounds by the element gold (Au). Although gold is the most noble of the noble metals , [ 1 ] [ 2 ] it still forms many diverse compounds. The oxidation state of gold in its compounds ranges from −1 to +5, but Au(I) and Au(III) dominate its chemistry.
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Organogold chemistry is the study of compounds containing gold–carbon bonds. They are studied in academic research, but have not received widespread use otherwise. The dominant oxidation states for organogold compounds are I with coordination number 2 and a linear molecular geometry and III with CN = 4 and a square planar molecular geometry.
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Gold(III) oxide (Au 2 O 3) is an inorganic compound of gold and oxygen with the formula Au 2 O 3.It is a red-brown solid that decomposes at 298 °C. [3]According to X-ray crystallography, Au 2 O 3 features square planar gold centers with both 2- and 3-coordinated oxides.
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Gold(I) sulfide, Au 2 S. Formed by reaction of hydrogen sulfide with gold(I) compounds. Gold(III) sulfide, Au 2 S 3, claimed material but unsubstantiated. Gold tellurides: Au 2 Te 3, Au 3 Te 5, and AuTe 2 (approximate formulas) are known as non-stoichiometric compounds. They show metallic conductivity. Au 3 Te 5 is a superconductor at 1.62 K. [1]
Gold(III) phosphate is a chemical compound with the formula AuPO 4. It is a pale yellow solid that is insoluble in water and acetone . It decomposes at 450 °C into gold metal, phosphorus pentoxide , and oxygen .