Caesium auride

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Caesium auride
Jmol-3D images Image 1
Molecular formula CsAu
Appearance Yellow crystals
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
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Infobox references

Caesium auride (CsAu) is an ionic compound containing the unusual Au ion. It is obtained by heating a stoichiometric mixture of caesium and gold; the two metallic-yellow liquids react to give a clear product. The solution in liquid ammonia is brown, and the solid is yellow; the ammonium adduct is dark blue.

The compound reacts violently with water, yielding caesium hydroxide, metallic gold, and hydrogen gas; in liquid ammonia it can be reacted with a caesium-specific ion exchange resin to produce tetramethylammonium auride.[1]


  1. ^ Jansen, Martin (2005-11-30). "Effects of relativistic motion of electrons on the chemistry of gold and platinum". Solid State Sciences 7 (12): 1464–1474. doi:10.1016/j.solidstatesciences.2005.06.015.