Gold(I) chloride

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Gold(I) chloride
Crystal AuCl.jpg
Other names
Gold(I) chloride
10294-29-8 N
ChEBI CHEBI:30078 YesY
ChemSpider 25464 YesY
Jmol-3D images Image
PubChem 27366
Molar mass 232.423 g/mol
Appearance yellow solid
Density 7.6 g/cm3 [1]
Melting point 170 °C (338 °F; 443 K)
Boiling point 298 °C (568 °F; 571 K) (decomposes)
very slightly soluble
Solubility soluble in HCl, HBr organic solvents
Crystal structure Tetragonal, tI16
Space group I41/amd, No. 141
NFPA 704
Flammability code 0: Will not burn. E.g., water Health code 2: Intense or continued but not chronic exposure could cause temporary incapacitation or possible residual injury. E.g., chloroform Reactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g., liquid nitrogen Special hazards (white): no codeNFPA 704 four-colored diamond
Except where noted otherwise, data is given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
 N verify (what isYesY/N?)
Infobox references

Gold(I) chloride is a compound of gold and chlorine with the chemical formula AuCl.


Gold(I) chloride is prepared by thermal decomposition of gold(III) chloride.


Although there is a region of stability at higher temperatures at the appropriate chlorine vapor pressures, the compound is metastable at ambient conditions. When heated with water, the compound disporpotionates to metallic gold and gold(III) chloride in an autoredox reaction:

3 AuCl → 2 Au + AuCl3

Reaction with potassium bromide yields potassium auric bromide and potassium chloride with separation of metallic gold:

3 AuCl + 4 KBr → KAuBr4 + 2 Au + 3 KCl


Gold(I) chloride may irritate the skin and eyes, damage kidney function, and reduce white blood cell counts.


  1. ^ Pradyot Patnaik. Handbook of Inorganic Chemicals. McGraw-Hill, 2002, ISBN 0-07-049439-8