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Gold(II) sulfate

Structure of gold(II) sulfate(Red spheres: Au; Yellow spheres: S; Blue spheres: O)
Names
Other names Gold sulfate Digold disulfate
Identifiers
CAS Number	371777-29-6
3D model (JSmol)	Interactive image
InChI InChI=1S/2Au.2H2O4S/c;;2*1-5(2,3)4/h;;2*(H2,1,2,3,4)/q2*+2;;/p-4Key: AVQFVNHKHZLJOY-UHFFFAOYSA-J
SMILES S(=O)(=O)..S(=O)(=O)
Properties
Molar mass	293.03 g/mol
Appearance	Red crystals
Density	5.51 g/cm
Structure
Crystal structure	Orthorhombic
Space group	Pbca
Lattice constant	a = 854.9 pm, b = 824.9 pm, c = 1001.4 pm
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). Infobox references

Gold(II) sulfate is the chemical compound with the formula AuSO₄ or more correctly Au₂(SO₄)₂. This compound was previously thought to be a mixed-valent compound as AuAu(SO₄)₂. But later, it was shown that it contained the diatomic cation, Au
₂ which made it the first simple inorganic gold(II) compound. The bond distance between the gold atoms in the diatomic cation is 249 pm.

Production and properties

Gold(II) sulfate is produced by reaction of sulfuric acid and gold(III) hydroxide. Gold(II) sulfate is unstable in air and oxidizes to hydrogen disulfoaurate(III)(HAu(SO₄)₂).

References

1. ^ Wickleder, Mathias S. (2001). "AuSO₄: A True Gold(II) Sulfate with an Au₂ Ion". Journal of Inorganic and General Chemistry. 627 (9): 2112–2114. doi:10.1002/1521-3749(200109)627:9<2112::AID-ZAAC2112>3.0.CO;2-2.
2. Wickleder, Mathias S. (2007). Devillanova, Francesco A. (ed.). Handbook of chalcogen chemistry: new perspectives in sulfur, selenium and tellurium. Royal Society of Chemistry. pp. 359–361. ISBN 978-0-85404-366-8.

• Gold compounds
• Sulfates