Gold chalcogenides

Gold chalcogenides are compounds formed between gold and one of the chalcogens, elements from group 16 of the periodic table: oxygen, sulfur, selenium, or tellurium.

Gold(III) oxide, Au₂O₃. Decomposes into gold and oxygen above 160 °C, and dissolves in concentrated alkalis to form solutions which probably contain the [Au(OH)₄]⁻ ion
Gold(I) sulfide, Au₂S. Formed by passing hydrogen sulfide through solutions of gold(I) compounds.
Gold(III) sulfide, Au₂S₃, unstable in the presence of water.
Gold tellurides: Au₂Te₃, Au₃Te₅, and AuTe₂ (approximate formulæ) are known as non-stoichiometric compounds. They show metallic conductivity. One telluride of gold is a superconductor at very low temperatures: Au₃Te₅ (1.62 K).^[1]

Natural gold tellurides, like calaverite and krennerite (AuTe₂), petzite ( Ag₃AuTe₂), and sylvanite (AgAuTe₄), are minor ores of gold (and tellurium). See telluride minerals for more information on individual naturally occurring tellurides.

References

^ Luo, H.L.; Merriam, M.F.; Hamilton, D.C. (1964). "Superconducting Metastable Compounds". Science. 145 (3632): 581–583. Bibcode:1964Sci...145..581L. doi:10.1126/science.145.3632.581. PMID 17735806.

Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 978-0-08-037941-8.

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[1] Luo, H.L.; Merriam, M.F.; Hamilton, D.C. (1964). "Superconducting Metastable Compounds". Science. 145 (3632): 581–583. Bibcode:1964Sci...145..581L. doi:10.1126/science.145.3632.581. PMID 17735806.

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