Gold(I) sulfide

Gold(I) sulfide
Names
IUPAC name
Gold(I) sulfide
Other names
Aurous sulfide
Identifiers
ECHA InfoCard 100.013.749
Properties
Au2S
Molar mass 425.998 g/mol
Insoluble
Related compounds
Other anions
 Copper(I) sulfide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Gold(I) sulfide is the inorganic compound with the formula Au2S. It is one of two principal sulfides of gold, the other being Au2S3. Both materials are unstable with respect to the elements.

Structure and preparation

The compound crystallizes in the motif seen for cuprous oxide: gold is 2-coordinate, sulfur 4-coordinate, and the S-Au-S linkage is linear.[1] Linear coordination geometry is typically adopted by gold(I) compounds, such as the coordination complex chloro(dimethyl sulfide)gold(I).

It can be prepared by treating gold chloride with hydrogen sulfide[2] It also arises by treating dicyanoaurate:

H2S + 2 KAu(CN)2 → Au2S + 2 KCN + 2 HCN

This product is described as "initially dark reddish-brown" solid that turns "steel-gray".[3][4]

References

  1. ↑ Wells, A.F. (1984) Structural Inorganic Chemistry, Oxford: Clarendon Press. ISBN 0-19-855370-6.
  2. ↑ N. N. Greenwood, A. Earnshaw, Chemistry of the Elements, 2nd ed., Butterworth-Heinemann, Oxford, UK, 1997.
  3. ↑ Faltens, Marjorie O. (1970). "Mössbauer Spectroscopy of Gold Compounds". The Journal of Chemical Physics. 53 (11): 4249. Bibcode:1970JChPh..53.4249F. doi:10.1063/1.1673931.
  4. ↑ Ishikawa, K.; Isonaga, T.; Wakita, S.; Suzuki, Y. (1970). "Structure and Electrical Properties of Au2S". Solid State Ionics. 79: 60–66. doi:10.1016/0167-2738(95)00030-A.
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