Potassium tetrachloroplatinate

Potassium tetrachloroplatinate

Chembox new
ImageFile = K2PtCl4.png ImageSize = 200px
IUPACName = Potassium tetrachloroplatinate(II)
OtherNames = Potassium tetrachloroplatinate Potassium Chloroplatinite
Potassium tetrachloridoplatinate
Section1 = Chembox Identifiers
CASNo = 10025-99-7
PubChem =
SMILES =
Section2 = Chembox Properties
Formula = Cl4K2Pt
MolarMass = 415.09
Appearance = reddish solid
Density = 3.38 g/cm3
MeltingPt =
BoilingPt =
Solubility = 0.93 g/100 mL (16 °C) 5.3/100 mL (100 °C)
Section3 = Chembox Hazards
MainHazards = allegenic
FlashPt =
Autoignition =

Potassium tetrachloroplatinate(II) 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 PtCl42-. Related salts are also known including K2PtCl4, which is brown-colored and soluble in alcohols, and quaternary ammonium salts, which are soluble in a broader range of organic solvents.

Preparation

Potassium tetrachloroplatinate is prepared by reduction of the corresponding hexachloroplatinate salt with hydrazine.cite journal | author = Keller, R. N.; Moeller, T. | title = Potassium Tetrachloroplatinate(II) | journal = Inorg. Synth. | year = 1963 | volume = 7 | pages = 247-250 | doi = 10.1002/9780470132333.ch79] 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. [cite journal | author = Elding, L. I.; Oskarsson, A.; Kukushkin, V. Yu | title = Platinum Complexes Suitable as Precursors for Synthesis in Nonaqueous Solvents | journal = Inorg. Synth. | year = 1997 | volume = 31 | pages = 276-279 | doi = 10.1002/9780470132623.ch47]

Reactions

The chloride ligands on [PtCl4] 2- are displaced by many other ligands to afford derivatives::PtCl42− + 2 PPh3 → "cis"-PtCl2(PPh3)2 + 2 Cl−The anti-cancer drug Cisplatin can similarly be prepared::PtCl42− + 2 NH3 → "cis"-PtCl2(NH3)2 + 2 Cl−Dithiolates displace all four chloride ligands to give bis(dithiolene) complexes. [Scott D. Cummings, Richard Eisenberg "Acid-Base Behavior of the Ground and Excited States of Platinum(II) Complexes of Quinoxaline-2,3-dithiolate" Inorganic Chemistry 1995, vol. 34, p 3396-3403.] Reduction gives colloidal platinum of potential interest in for catalysis. [Ahmadi, T. S. "Science" volume 272, page 1924ff (1996)]

References


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