Platinum tetrafluoride
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| Names | |
|---|---|
| IUPAC name
platinum(IV) fluoride
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| Identifiers | |
| 13455-15-7 | |
| PubChem | 139460 |
| Properties | |
| F4Pt | |
| Molar mass | 271.078[1] |
| Appearance | red-orange solid[1] |
| Density | 7.08 g/cm3 (calc.)[2] |
| Melting point | 600 °C (1,112 °F; 873 K)[1] |
| Structure | |
| Orthorombic, oF40 | |
| Fdd2, No. 43[2] | |
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a = 0.9284 nm, b = 0.959 nm, c = 0.5712 nm
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| Vapor pressure | {{{value}}} |
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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| Infobox references | |
Platinum tetrafluoride is the inorganic compound with the chemical formula PtF
4. In the solid state, the compound features platinum(IV) in octahedral coordination geometry.[2]
Preparation
The compound was first reported by Henri Moissan by the fluorination of platinum metal in the presence of hydrogen fluoride.[3] A modern synthesis involves thermal decomposition of platinum hexafluoride.[4]
Properties
Platinum tetrafluoride vapour at 298.15 K consists of individual molecules. The enthalpy of sublimation is 210 kJmol−1.[5] Original analysis of powdered PtF4 suggested a tetrahedral molecular geometry, but later analysis by several methods identified it as octahedral, with four of the six fluorines on each platinum bridging to adjacent platinum centres.[6]
Reactions
A solution of platinum tetrafluoride in water is coloured reddish brown, but it rapidly decomposes, releasing heat and forming an orange coloured platinum dioxide hydrate precipitate and fluoroplatinic acid.[7] When heated to a red hot temperature platinum tetrafluoride decomposes to platinum metal and fluorine gas. When heated in contact with glass, silicon tetrafluoride gas is produced along with the metal.[7]
Platinum tetrafluoride can form adducts with selenium tetrafluoride and bromine trifluoride.[7] Volatile crystalline adducts are also formed in combination with BF3, PF3, BCl3, and PCl3.[7]
Related compounds
The fluoroplatinates are salts containing the PtF62− ion. Fluoroplatinic acid H2PtF6 forms yellow crystals, that absorb water from the air. Ammonium, sodium, magnesium, calcium, strontium, and rare earth including lanthanum fluoropalatinate salts are soluble in water.[7] potassium, rubidium, caesium, and barium salts are insoluble in water.[7]
References
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