| |||
| Names | |||
|---|---|---|---|
| IUPAC name Dioxygenyl hexafluoroplatinate | |||
| Other names Dioxygenyl hexafluoroplatinate(V) | |||
| Identifiers | |||
3D model (JSmol) | |||
| |||
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| Properties | |||
| F6O2Pt | |||
| Molar mass | 341.072 g·mol−1 | ||
Except where otherwise noted, data are given for materials in theirstandard state (at 25 °C [77 °F], 100 kPa). | |||
Dioxygenyl hexafluoroplatinate is acompound with formula O2PtF6. It is ahexafluoroplatinate of the unusualdioxygenyl cation, O2+, and is the first known compound containing this cation.[1] It can be produced by the reaction ofdioxygen withplatinum hexafluoride. The fact thatPtF
6 is strong enough to oxidiseO
2, whose firstionization potential is 12.2 eV, ledNeil Bartlett to correctly surmise that it might be able to oxidisexenon (first ionization potential 12.13 eV). This led to the discovery ofxenon hexafluoroplatinate,[2] which proved that thenoble gases, previously thought to be inert, are able to form chemical compounds.
Dioxygenyl hexafluoroplatinate can be synthesized from the elements by the action of a mixture ofoxygen andfluorine gas onplatinum sponge at 450 °C.[1] It can also be prepared by the reaction ofoxygen difluoride (OF
2) withplatinum sponge. At 350 °C,platinum tetrafluoride is produced; above 400 °C, dioxygenyl hexafluoroplatinate is formed.[1]
Bartlett demonstrated that it can be synthesized at room temperature by the reaction of oxygen gas withPtF
6.[1]
Dioxygenyl hexafluoroplatinate(V) has arhombohedral crystal structure at low temperatures, and a cubic structure at high temperatures,[3] isomorphous topotassium hexafluoroplatinate(V),KPtF
6. Its ionic lattice is indicated by its insolubility incarbon tetrafluoride. In its cubic form, thePtF−
6 octahedra are slightly compressed along the three-fold rotational axis, along which the long axis of the[O
2]+
cations also lies. EachO+
2 cation is surrounded by 12 fluorine atoms, 6 of which surround it in a puckered six-membered ring, and of the remaining 3 each belong to the twoPtF−
6 octahedra lying along the long axis of the cation.[1]
Dioxygenyl hexafluoroplatinate(V) is a convenient route to prepare other platinum(V) compounds, such as potassium hexafluoroplatinate(V) via reaction withpotassium fluoride iniodine pentafluoride (IF
5) solution[3] in whichiodine heptafluoride is produced:
