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(Top) 1 Structure and preparation 2 References

Gold(I) sulfide

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Gold(I) sulfide
Names

IUPAC name Gold(I) sulfide
Other names Aurous sulfide
Identifiers
CAS Number	1303-60-2^Y
3D model (JSmol)	Interactive image
ChemSpider	14028556^Y
ECHA InfoCard	100.013.749
EC Number	215-123-7
PubChem CID	22904715
UNII	03VC3O9F7W
CompTox Dashboard (EPA)	DTXSID2061648
InChI InChI=1S/2Au.S/q2*+1;-2 Key: YVIYNOINIIHOCG-UHFFFAOYSA-N
SMILES [S-2].[Au+].[Au+]
Properties
Chemical formula	Au₂S
Molar mass	425.998 g/mol
Density	11 g/cm³^[1]
Melting point	240 °C (464 °F; 513 K)
Solubility in water	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). Y verify (what is ^YN ?) Infobox references

Gold(I) sulfide is the inorganic compound with the formula Au₂S. It is the principal sulfideofgold. It decomposes to gold metal and elemental sulfur, illustrating the "nobility" of gold.

Structure and preparation[edit]

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.^[2] Linear coordination geometry is typical of gold(I) compounds, e.g. the coordination complex chloro(dimethyl sulfide)gold(I). The structure is similar to the α form of silver sulfide (argentite), which only exists at high temperatures.^[3]

It can be prepared by treating gold chloride with hydrogen sulfide^[4] It also arises by sulfiding dicyanoaurate:

H₂S + 2 K[Au(CN)₂] → Au₂S + 2 KCN + 2 HCN

This product is described as "initially dark reddish-brown" solid that turns "steel-gray".^[5]^[3]

References[edit]

^ Perry, Dale, ed. (1995). Handbook of Inorganic Compounds. p. 184. ISBN 9780849386718.

^ Wells, A.F. (1984) Structural Inorganic Chemistry, Oxford: Clarendon Press. ISBN 0-19-855370-6.

^ ^a ^b Ishikawa, K. (1995). "Structure and Electrical Properties of Au₂S". Solid State Ionics. 79: 60–66. doi:10.1016/0167-2738(95)00030-A.

^ N. N. Greenwood, A. Earnshaw, Chemistry of the Elements, 2nd ed., Butterworth-Heinemann, Oxford, UK, 1997.

^ Faltens, Marjorie O. (1970). "Mössbauer Spectroscopy of Gold Compounds". The Journal of Chemical Physics. 53 (11): 4249–4264. Bibcode:1970JChPh..53.4249F. doi:10.1063/1.1673931.