Potassium tetrachloroplatinate

Potassium tetrachloroplatinate

IUPAC name	Potassium tetrachloroplatinate(II)
Other names	Potassium tetrachloroplatinate Potassium Chloroplatinite
Identifiers
CAS number	10025-99-7
Properties
Molecular formula	Cl₄K₂Pt
Molar mass	415.09
Appearance	reddish solid
Density	3.38 g/cm³
Solubility in water	0.93 g/100 mL (16 °C) 5.3/100 mL (100 °C)
Hazards
Main hazards	allegenic
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox disclaimer and references

Potassium tetrachloroplatinate is the chemical compound with the formula K₂PtCl₄. This reddish pink-colored salt is an important reagent for the preparation of other coordination complexes of platinum. It consists of potassium cations and the square planar dianion PtCl₄^2-.

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K₂PtCl₄ is prepared by reduction of K₂PtCl₆ with hydrazine.^[1] K₂PtCl₆ is one of the salts that is most easily obtained from platinum ores. The complex is appreciably soluble only in water. Treatment with alcohols, especially in the presence of base, causes reduction to platinum metal. Conversion to organic salts, such as [PPN]₂PtCl₄ are soluble in chlorocarbons. ^[2]

The chloride ligands on PtCl₄^2- are displaced by many other ligands to afford derivatives:

K₂PtCl₄ + 2 PPh₃ → cis-PtCl₂(PPh₃)₂ + 2 KCl

The anti-cancer drug Cisplatin can similarly be prepared:^[1]

K₂PtCl₄ + 2 NH₃ → cis-PtCl₂(NH₃)₂ + 2 KCl

References

^ ^a ^b Keller, R. N.; Moeller, T. ”Potassium Tetrachloroplatinate(II)" Inorganic Syntheses 1963, volume VII, pp.247-250.
^ Elding, L. I.; Oskarsson, A.; Kukushkin, V. Yu "Platinum Complexes Suitable as Precursors for Synthesis in Nonaqueous Solvents" Inorganic Syntheses, 1997, volume 31, pp 276-279.SBN: 9780471152880.

Categories: Platinum compounds | Chlorides | Metal halides | Potassium compounds