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==Preparation and structure== |
==Preparation and structure== |
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The compound consists of separate [[tetrahedral molecular geometry|tetrahedral]] [[ammonium]] cations and [[octahedral molecular geometry|octahedral]] [PtCl<sub>6</sub>]<sup>2−</sup> anions. It is usually generated as a fine yellow precipitate by treating a solution of [[chloroplatinic acid|hexachloroplatinic acid]] with a solution of an ammonium salt.<ref name=Kauuf>{{cite journal | title = Ammonium Hexachloroplatinate(IV) | author = [[George B. Kauffman]] | year = 1967 | journal = [[Inorganic Syntheses]] | volume = 9 | pages = 182–185 | doi = 10.1002/9780470132401.ch51 | last2 = Thurner | first2 = Joseph J. | last3 = Zatko | first3 = David A.}}</ref> The complex is so poorly soluble that this step is employed in the isolation of platinum from ores and recycled residues.<ref>Cotton, S. A. Chemistry of Precious Metals, Chapman and Hall (London): 1997. ISBN 0-7514-0413-6.</ref> |
The compound consists of separate [[tetrahedral molecular geometry|tetrahedral]] [[ammonium]] cations and [[octahedral molecular geometry|octahedral]] [PtCl<sub>6</sub>]<sup>2−</sup> anions. It is usually generated as a fine yellow precipitate by treating a solution of [[chloroplatinic acid|hexachloroplatinic acid]] with a solution of an ammonium salt.<ref name=Kauuf>{{cite journal | title = Ammonium Hexachloroplatinate(IV) | author = [[George B. Kauffman]] | year = 1967 | journal = [[Inorganic Syntheses]] | volume = 9 | pages = 182–185 | doi = 10.1002/9780470132401.ch51 | last2 = Thurner | first2 = Joseph J. | last3 = Zatko | first3 = David A. | series = Inorganic Syntheses | isbn = 9780470132401}}</ref> The complex is so poorly soluble that this step is employed in the isolation of platinum from ores and recycled residues.<ref>Cotton, S. A. Chemistry of Precious Metals, Chapman and Hall (London): 1997. ISBN 0-7514-0413-6.</ref> |
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==Uses and reactions== |
==Uses and reactions== |
Revision as of 04:33, 9 January 2012
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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ChEBI | |
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. Inorganic Syntheses. 9: 182–185. doi:10.1002/9780470132401.ch51. ISBN 9780470132401.
- ^ Cotton, S. A. Chemistry of Precious Metals, Chapman and Hall (London): 1997. ISBN 0-7514-0413-6.