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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 ()− 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. Two tellurides of gold are superconductors at very low temperatures: AuTe3 (2.6 K) and Au3Te5 (1.62 K). 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. A gold-sulfur bond is strong, not only involving inorganic sulfur ligands (Sx2−) but also thiolates. Gold has a high electronegativity (2.4 on the Pauling scale). It forms moderately strong bonds to sulfur (126-146 kJ/mol). This bond is widely employed to attach biological linkers, functional groups and other molecules to colloidal gold nanoparticles for research purposes, especially live-cell microscopic imaging that depend on gold's surface plasmon resonance. ==References== * 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Gold chalcogenides」の詳細全文を読む スポンサード リンク
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