![]() | |
Names | |
---|---|
IUPAC name Platinum(IV) fluoride | |
Other names Platinum tetrafluoride Platinous fluoride | |
Identifiers | |
3D model (JSmol) | |
ChemSpider | |
PubChem CID | |
CompTox Dashboard (EPA) | |
| |
| |
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] |
+455.0·10−6 cm3/mol | |
Structure | |
Orthorhombic, oF40 | |
Fdd2, No. 43 [2] | |
a = 0.9284 nm, b = 0.959 nm, c = 0.5712 nm | |
Related compounds | |
Other anions | Platinum(IV) bromide Platinum(IV) chloride |
Related compounds | Platinum(V) fluoride Platinum(VI) fluoride |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). |
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]
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]
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]
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]
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]