Potassium tetrachloroplatinate
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| Potassium tetrachloroplatinate | |
|---|---|
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| IUPAC name | Potassium tetrachloroplatinate(II) |
| Other names | Potassium tetrachloroplatinate Potassium Chloroplatinite Potassium tetrachloridoplatinate |
| 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 |
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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.
[edit] Preparation
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]
[edit] 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:[1]
- PtCl42− + 2 NH3 → cis-PtCl2(NH3)2 + 2 Cl−
Dithiolates displace all four chloride ligands to give bis(dithiolene) complexes.[3] Reduction gives colloidal platinum of potential interest in for catalysis.[4]
[edit] References
- ^ a b Keller, R. N.; Moeller, T. ”Potassium Tetrachloroplatinate(II)" Inorganic Syntheses 1963, volume VII, pp.247-250.doi:10.1002/9780470132333.ch79
- ^ 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. doi:10.1002/9780470132623.ch47.
- ^ 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.
- ^ Ahmadi, T. S. Science volume 272, page 1924ff (1996)
