2PtCl6.svg) | |
 | |
| Names | |
|---|---|
| IUPAC name Ammonium hexachloroplatinate(IV) | |
| Other names ammonium chloroplatinate | |
| Identifiers | |
3D model (JSmol) | |
| ChEBI | |
| ChemSpider |
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| ECHA InfoCard | 100.037.233 |
| EC Number |
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| UNII | |
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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)[1] 0.499 g/100ml (20 °C) 3.36 g/100ml (100 °C) | |
| Hazards | |
| GHS labelling: | |
   | |
| Danger | |
| H290,H301,H317,H318,H334 | |
| P234,P261,P264,P270,P272,P280,P285,P301+P310,P302+P352,P304+P341,P305+P351+P338,P310,P321,P330,P333+P313,P342+P311,P363,P390,P404,P405,P501 | |
| Lethal dose or concentration (LD, LC): | |
LD50 (median dose) | 195 mg/kg rat |
Except where otherwise noted, data are given for materials in theirstandard state (at 25 °C [77 °F], 100 kPa). | |
Ammonium hexachloroplatinate, also known as ammonium chloroplatinate, is theinorganic compound with the formula (NH4)2[PtCl6]. It is a rare example of a solubleplatinum(IV)salt that is nothygroscopic. It forms intensely yellow solutions in water. In the presence of 1MNH4Cl, its solubility is only 0.0028 g/100 mL.
The compound consists of separatetetrahedralammoniumcations andoctahedral [PtCl6]2−anions. It is usually generated as a fine yellow precipitate by treating a solution ofhexachloroplatinic acid with a solution of an ammonium salt.[2] The complex is so poorly soluble that this step is employed in the isolation of platinum from ores and recycled residues.[3]
As analyzed byX-ray crystallography, the salt crystallizes in a cubic motif reminiscent of thefluorite structure. The [PtCl6]2− centers are octahedral. The NH4+ centers arehydrogen bonded to thechlorideligands.[4]
Ammonium hexachloroplatinate is used in platinum plating. Heating (NH4)2[PtCl6] under a stream ofhydrogen at 200 °C producesplatinum sponge. Treating this with chlorine gives H2[PtCl6].[2]
Ammonium hexachloroplatinatedecomposes to yield platinum sponge when heated to high temperatures:[2][5]
Dust containing ammonium hexachloroplatinate can be highly allergenic. "Symptoms range from irritation of skin and mucous membranes to life-threatening attacks of asthma."[6]
