Platinum hexafluoride

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Platinum hexafluoride
PtF6.png
Identifiers
ChemSpider 21106464 YesY
Jmol-3D images Image 1
Properties
Molecular formula PtF6
Molar mass 309.07 g/mol
Appearance dark-red crystals
Density 3.83 g/cm3
Melting point 61.3 °C
Boiling point 69.14 °C
Solubility in water reacts violently
Structure
Crystal structure Orthorhombic, oP28
Space group Pnma, No. 62
Coordination
geometry
octahedral (Oh)
Dipole moment 0
Hazards
Main hazards oxidizer
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
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Infobox references

Platinum hexafluoride is the chemical compound with the formula PtF6. It is a dark-red volatile solid that forms a red gas. The compound is a unique example of platinum in the +6 oxidation state. With only four d-electrons, it is paramagnetic with a triplet ground state. PtF6 is a strong oxidant and a strong fluorinating agent. PtF6 is octahedral in both the solid state and in the gaseous state. The Pt-F bond lengths are 185 picometers.[1]

Synthesis[edit]

PtF6 was first prepared by reaction of fluorine with platinum metal.[2] This route remains the method of choice.[1]

Pt + 3 F2 → PtF6

PtF6 can also be prepared by disproportionation of PtF5. The required PtF5 can be obtained by fluorinating PtCl2:

2 PtCl2 + 5 F2 → 2 PtF5 + 2 Cl2
2 PtF5 → PtF6 + PtF4

Hexafluoroplatinates[edit]

Platinum hexafluoride can gain an electron to form the hexafluoroplatinate anion, PtF
6
. It is formed by reacting platinum hexafluoride with relatively uncationisable elements and compounds, for example with xenon to form "XePtF
6
" (actually a mixture of XeFPtF
5
, XeFPt
2
F
11
, and Xe
2
F
3
PtF
6
), known as xenon hexafluoroplatinate. The discovery of this reaction in 1962 proved that noble gases form chemical compounds. Previous to the experiment with xenon, PtF
6
had been shown to react with oxygen to form [O2]+[PtF6], dioxygenyl hexafluoroplatinate.

See also[edit]

References[edit]

  1. ^ a b Drews, T.; Supel, J.; Hagenbach, A.; Seppelt, K. “Solid State Molecular Structures of Transition Metal Hexafluorides” Inorganic Chemistry 2006, volume 45, pp 3782-3788.doi:10.1021/ic052029f
  2. ^ Weinstock, B.; Claassen, H. H.; Malm, J. G. “Platinum Hexafluoride” Journal of the American Chemical Society 1957, volume 79, pp 5832 - 5832. doi:10.1021/ja01578a073

General reading[edit]

  • Holleman, A. F.; Wiberg, E. "Inorganic Chemistry" Academic Press: San Diego, 2001. ISBN 0-12-352651-5.