Ammonium hexachloroplatinate
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| Ammonium hexachloroplatinate | |
|---|---|
| Image:Ammonium hexachloroplatinate.png | |
| IUPAC name | Ammonium hexachloroplatinate(IV) |
| Identifiers | |
| CAS number | [16919-58-7] |
| Properties | |
| Molecular formula | (NH4)2PtCl6 |
| Molar mass | 443.87 g/mol |
| Density | 3.07 g/cm3 |
| Melting point |
°C |
| Solubility in other solvents | 0.5 g/100 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, 100 kPa) Infobox disclaimer and references |
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Ammonium hexachloroplatinate, also known as ammonium chloroplatinate, is an inorganic compound with the formula (NH4)2PtCl6. 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 0.0028g/100 mL.
[edit] Preparation and structure
The compound consists of separate ammonium cations and octahedral [PtCl6]2- anions. It is usually generated by treating a solution of chloroplatinic acid with a solution of an ammonium salt.[1] The fine yellow salt precipitates. The complex is so poorly soluble that this step is employed in the isolation of platinum from ores and recycled residues.[2]
[edit] Uses and reactions
This yellow powder is used in platinum plating.
Heating (NH4)2PtCl6 under a stream of hydrogen at 200 °C produces platinum sponge. Treatment with chlorine gives H2PtCl6.[1]
[edit] References
- ^ a b Kauffman, G. B. "Ammonium Hexachloroplatinate" Inorganic Syntheses McGraw-Hill: New York, 1967, IX, pages 182-4.
- ^ Cotton, S. A. Chemistry of Precious Metals, Chapman and Hall (London): 1997. ISBN 0-7514-0413-6.
