Sodium_tetrachloroaurate

Sodium tetrachloroaurate

Sodium tetrachloroaurate

Chemical compound

Sodium tetrachloroaurate is an inorganic compound with the chemical formula NaAuCl4. It is composed of the ions Na+ and AuCl4−. It exists in the anhydrous and dihydrate states. At room temperature, it exists as a golden-orange solid. The anhydrous and dihydrate forms are available commercially.[1]

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Preparation

The conventional method of preparation of sodium tetrachloroaurate involves the addition of tetrachloroauric acid solution to sodium chloride or sodium carbonate to form a mixture. The mixture is stirred at 100 °C, and then subjected to evaporation, cooling, crystallization, and drying to obtain the orange crystals of sodium tetrachloroaurate.[4][6]

H[AuCl4] + NaCl → Na[AuCl4] + HCl
2 H[AuCl4] + Na2CO3 → 2 Na[AuCl4] + H2O + CO2

However, more efficient preparation methods have been discovered recently. These are the addition of gold with sodium oxy-halogen salts and hydrochloric acid.[6]

Uses

It is used in a wide range of applications. For example, it is used as a catalyst for the hydrochlorination of acetylene, or the oxidation of sulfides.[4]

References

  1. [1]
    PubChem. "Sodium tetrachloroaurate". pubchem.ncbi.nlm.nih.gov. Retrieved 2019-05-19.
  2. [2]
    Jones, P. G.; Hohbein, R.; Schwarzmann, E. (1988-07-15). "Anhydrous sodium tetrachloroaurate(III)". Acta Crystallographica Section C Crystal Structure Communications. 44 (7). International Union of Crystallography (IUCr): 1164–1166. Bibcode:1988AcCrC..44.1164J. doi:10.1107/s0108270188002756. ISSN 0108-2701.
  3. [3]
    Perry, Dale L. (2011). Handbook of Inorganic Compounds. CRC Press; 2 edition (May 18, 2011). p. 380. ISBN 9781439814611.
  4. [4]
    Westcott, Stephen A. (2001), "Sodium Tetrachloroaurate(III)", Encyclopedia of Reagents for Organic Synthesis, American Cancer Society, doi:10.1002/047084289x.rs108, ISBN 9780470842898
  5. [5]
    "Sodium Tetrachloroaurate". www.espimetals.com. Retrieved 2019-05-20.
  6. [6]
    US 10046976, Lu, Lin; Wang, Chen-Hsiang & Fan, Kuei-Sheng et al., "Method of making inorganic gold compound", published 2018-08-14, assigned to Tripod Technology Corp.
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