A straightforward route to tetrachloroauric acid from gold metal and molecular chlorine for nanoparticle synthesis

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Abstract

Aqueous solutions of tetrachloroauric acid of high purity and stability were synthesised using the known reaction of gold metal with chlorine gas. The straightforward procedure developed here allows the resulting solution to be used directly for gold nanoparticle synthesis. The procedure involves bubbling chlorine gas through pure water containing a pellet of gold. The reaction is quantitative and progressed at a satisfactory rate at 50 °C. The gold(III) chloride solutions produced by this method show no evidence of returning to metallic gold over at least twelve months. This procedure also provides a straightforward method to determine the concentration of the resulting solution using the initial mass of gold and volume of water.

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King, S. R., Massicot, J., & McDonagh, A. M. (2015). A straightforward route to tetrachloroauric acid from gold metal and molecular chlorine for nanoparticle synthesis. Metals, 5(3), 1454–1461. https://doi.org/10.3390/met5031454

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