Gold(II) sulfate
# Gold(II) sulfate

Gold(II) sulfate is the chemical compound with the formula $AuSO_4$ or more correctly $Au_2(SO_4)_2.$ This compound was previously thought to be a mixed-valent compound as $Au^IAu^{III}(SO_4)_2.$ But later, it was shown that it contained the diatomic cation, $Au^{4+}$ $_2$ 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 $disulfoaurate(III)(HAu(SO_4)_2).$

