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Dioxygenyl
From Wikipedia, the free encyclopedia
The dioxygenyl ion, O2+, is a rarely-encountered oxocation in which both oxygen atoms have an oxidation state of +½. It can be considered to be formally derived from dioxygen by the removal of an electron:
- O2 → O2+ + e−
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O2+ has a bond order of 2.5, and O−O distance of 112.3 pm, a molar bond energy of 625.1 kJ mol−1 and stretching frequency of 1858 cm−1.
The reaction of dioxygen, O2, with platinum hexafluoride, PtF6, yields dioxygenyl hexafluoroplatinate, O2[PtF6]:
- O2 + PtF6 → O2[PtF6]
Reactions of this type are rare, as there are very few oxidising agents powerful enough to oxidise O2. PtF6 is, however, one of the few compounds that possess this ability.
Dioxygenyl hexafluoroplatinate played a pivotal role in the discovery of noble gas compounds. After Neil Bartlett found that PtF6 could oxidise O2 to O2+, he investigated its reaction with noble gases and found that Xe[PtF6] could also be generated.
O2+ is also found in the similar compound O2[AsF6], dioxygenyl hexafluoroarsenate.