Names | |
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IUPAC name
Ammonium hexachloroplatinate(IV)
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Other names
ammonium chloroplatinate
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Identifiers | |
16919-58-7 | |
3D model (Jmol) | Interactive image |
ChEBI | CHEBI:59604 |
ChemSpider | 10628022 |
ECHA InfoCard | 100.037.233 |
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Properties | |
(NH4)2PtCl6 | |
Molar mass | 443.87 g/mol |
Appearance | yellow crystals |
Odor | odorless |
Density | 3.065 g/cm3 |
Melting point | 380 °C (716 °F; 653 K) decomposes |
0.289 g/100ml (0 °C) 0.7 g/100ml (15 °C) 0.499 g/100ml (20 °C) 3.36 g/100ml (100 °C) |
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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what is ?) | (|
Infobox references | |
Ammonium hexachloroplatinate, also known as ammonium chloroplatinate, is the inorganic 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.
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. The complex is so poorly soluble that this step is employed in the isolation of platinum from ores and recycled residues.
As analyzed by X-ray crystallography, the salt crystallizes in a cubic motif reminiscent of the fluorite structure. The [PtCl6]2− centers are octahedral. The NH4+ centers are hydrogen bonded to the chloride ligands.
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.