Auride

from Wikipedia, the free encyclopedia

Aurides are chemical compounds of the element gold , which is in the position of the single negatively charged anion Au - . It is one of the very rare metal anions and, besides platinum, the only known subgroup element that can exist as an anion. The very inert gold is usually dignified in nature and rarely occurs as a cation.

The first known aurid is cesium aurid CsAu, which was discovered in 1978 in the Joseph Lagowski laboratory . Moreover were rubidium auride RbAu and Tetramethylammonium auride, (CH 3 ) 4 NAU described. The Au - ion also occurs in the compound cesium auride oxide, Cs 3 AuO. A hypothetically possible Franciumaurid woman was due to the low half-life of francium not be synthesized. In certain cases the auride ion can also be obtained by disproportionation of elemental gold. When gold melts together with alkali metal and alkali metal oxide, M 7 Au 5 O 2 (M = Cs, Rb; corresponds to: (MAu) 4 (M 3 AuO 2 )) is formed. These auride aurates contain both positive gold (I) in the (AuO 2 ) 3− -anion (aurate -anion) and the negative auride-anion in one crystal , without forming elemental gold.

Chemical properties

Aurides react extremely violently with oxidizing agents and water and can only be used in a protective atmosphere, e.g. B. be kept under argon.

Individual evidence

  1. ^ William J. Peer, JJ Lagowski: Metal-Ammonia Solutions. 11. Au - , a solvated transition metal anion . In: Journal of the American Chemical Society . tape 100 , no. 19 , 1978, p. 6260-6261 , doi : 10.1021 / ja00487a064 .
  2. ↑ Cesium Auride Has Relativistic Electrons? In: quirkyscience.com. August 20, 2014, accessed December 12, 2016 .
  3. ↑ Anja-Verena Mudring, Martin Jansen: Base-induced disproportionation of elemental gold . In: Angewandte Chemie . tape 112 , no. 17 , 2000, pp. 3194-3196 , doi : 10.1002 / 1521-3757 .
  4. ↑ Martin Jansen: The chemistry of gold as an anion . In: Chemical Society Reviews . tape 37 , 2008, p. 1826-1835 , doi : 10.1039 / B708844M .