Ammonium Hexachloroplatinate - Leather Digital Watch - Digital Dive Watches Manufacturer

Ammonium hexachloroplatinate

Ammonium hexachloroplatinate

IUPAC name

Ammonium hexachloroplatinate(IV)

other names

ammonium chloroplatinate

Identifiers

CAS number

16919-58-7

ChemSpider

10628022

SMILES

[NH4+].[NH4+].Cl[Pt-2](Cl)(Cl)(Cl)(Cl)Cl

InChI

1/6ClH.2H3N.Pt/h6*1H;2*1H3;/q;;;;;;;;+4/p-4/rCl6Pt.2H3N/c1-7(2,3,4,5)6;;/h;2*1H3/q-2;;/p+2

InChI key

PCCGQTHFYHJATL-WPAIPAOFAY

Properties

Molecular formula

[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 noted otherwise, data are given for materials in their standard state (at 25C, 100kPa)

Infobox references

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 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.

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. Platinum salts are sensitizing agents and should only be handled by experts due to the very small exposure limit which may cause platinosis.

References

^ a b George B. Kauffman (1967). "Ammonium Hexachloroplatinate(IV)". Inorganic Syntheses 9: 182185. doi:10.1002/9780470132401.ch51.

^ Cotton, S. A. Chemistry of Precious Metals, Chapman and Hall (London): 1997. ISBN 0-7514-0413-6.

Categories: Platinum compounds | Ammonium compounds

by: gaga

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