Gold(I) chloride

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Gold(I) chloride
Crystal AuCl.jpg
Other names
Gold(I) chloride
3D model (JSmol)
ECHA InfoCard 100.030.583
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
−67.0·10−6 cm3/mol
Tetragonal, tI16
I41/amd, No. 141
Safety data sheet MSDS
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 otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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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