Gold(I) sulfide

Gold(I) sulfide
Names
	IUPAC name Gold(I) sulfide
	Other names Aurous sulfide
Identifiers
CAS Number	1303-60-2 ;
3D model (JSmol)	Interactive image;
ChemSpider	14028556 ;
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). verify (what is ?) Infobox references

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

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.[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

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.
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.

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[hic-1] Perry, Dale, ed. (1995). Handbook of Inorganic Compounds. p. 184. ISBN 9780849386718.

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

[Ishikawa-3] Ishikawa, K. (1995). "Structure and Electrical Properties of Au₂S". Solid State Ionics. 79: 60–66. doi:10.1016/0167-2738(95)00030-A.

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

[5] 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.