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| Names | |
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| IUPAC name
Ammonium hexachloroplatinate(IV)
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| Other names
ammonium chloroplatinate
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| Identifiers | |
3D model (JSmol)
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| ChemSpider | |
| ECHA InfoCard | 100.037.233 |
CompTox Dashboard (EPA)
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| Properties | |
| [NH4]2[PtCl6] | |
| Molar mass | 443.87 g/mol |
| Density | 3.07 g/cm3 |
| Solubility in other solvents | 0.5 g/100 mL (20 °C) 3.365 g/100 mL (100 °C) |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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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
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
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
- ^ a b George B. Kauffman; Thurner, Joseph J.; Zatko, David A. (1967). "Ammonium Hexachloroplatinate(IV)". Inorganic Syntheses. 9: 182–185. doi:10.1002/9780470132401.ch51.
- ^ Cotton, S. A. Chemistry of Precious Metals, Chapman and Hall (London): 1997. ISBN 0-7514-0413-6.