Ammonium hexachloroplatinate

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Ammonium hexachloroplatinate
Ammonium hexachloroplatinate
Identifiers
CAS number 16919-58-7
ChemSpider 10628022 YesY
ChEBI CHEBI:59604 YesY
Jmol-3D images Image 1
Properties
Molecular formula (NH4)2PtCl6
Molar mass 443.87 g/mol
Density 3.07 g/cm3
Solubility in other solvents 0.5 g/ mL (20 °C)
3.365 g/100 mL (100 °C)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
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Infobox references

Ammonium hexachloroplatinate, also known as ammonium chloroplatinate, is a chemical compound with the formula [NH4]2[PtCl6]. It is a rare example of a soluble platinum(IV) salt that is not hygroscopic. It forms intensely yellow solutions in water. In the presence of 1M NH4Cl, its solubility is only 0.0028 g/100 mL.

Preparation and structure[edit]

The compound consists of separate tetrahedral ammonium cations and octahedral [PtCl6]2− anions. It is usually generated as a fine yellow precipitate by treating a solution of hexachloroplatinic acid with a solution of an ammonium salt.[1] The complex is so poorly soluble that this step is employed in the isolation of platinum from ores and recycled residues.[2]

Uses and reactions[edit]

Ammonium hexachloroplatinate is used in platinum plating.

Heating [NH4]2[PtCl6] under a stream of hydrogen at 200 °C produces platinum sponge. Treating this with chlorine gives H2PtCl6.[1]

References[edit]

  1. ^ a b George B. Kauffman; Thurner, Joseph J.; Zatko, David A. (1967). "Ammonium Hexachloroplatinate(IV)". Inorganic Syntheses. Inorganic Syntheses 9: 182–185. doi:10.1002/9780470132401.ch51. ISBN 978-0-470-13240-1. 
  2. ^ Cotton, S. A. Chemistry of Precious Metals, Chapman and Hall (London): 1997. ISBN 0-7514-0413-6.