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CsAu
Caesium auride is the inorganic compound with the formula CsAu. It is the Cs+ salt of the unusual Au− anion. __TOC__ Preparation and reactions CsAu is obtained by heating a stoichiometric mixture of caesium and gold. The two metallic-yellow liquids react to give a transparent yellow product. Despite being a compound of two metals, CsAu lacks metallic properties since it is a salt with localized charges; it instead behaves as a semiconductor with band gap 2.6 eV. The compound hydrolyzes readily, yielding caesium hydroxide, metallic gold, and hydrogen. :2 CsAu + 2 H2O → 2 CsOH + 2 Au + H2 The solution in liquid ammonia is brown, and the ammonia adduct is blue; the latter has ammonia molecules intercalated between layers of the CsAu crystal parallel to the (110) plane. Solutions undergo metathesis with tetramethylammonium loaded ion exchange resin to give tetramethylammonium auride Tetramethylammonium auride, , is an ionic compound containing tetramethylammonium as cat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gold(−I) Compounds
Gold is a chemical element; it has chemical symbol Au (from Latin ) and atomic number 79. In its pure form, it is a bright, slightly orange-yellow, dense, soft, malleable, and ductile metal. Chemically, gold is a transition metal, a group 11 element, and one of the noble metals. It is one of the least reactive chemical elements, being the second-lowest in the reactivity series. It is solid under standard conditions. Gold often occurs in free elemental (native state), as nuggets or grains, in rocks, veins, and alluvial deposits. It occurs in a solid solution series with the native element silver (as in electrum), naturally alloyed with other metals like copper and palladium, and mineral inclusions such as within pyrite. Less commonly, it occurs in minerals as gold compounds, often with tellurium (gold tellurides). Gold is resistant to most acids, though it does dissolve in aqua regia (a mixture of nitric acid and hydrochloric acid), forming a soluble tetrachloroaurate anio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
