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  The dioxygenyl ion, O2+, is a rarely-encountered oxycation in which both oxygen atoms have an oxidation state of +½. It is formally derived from oxygen by the removal of an electron:

O2 → O2+ + e

The energy change for this process is called the ionization energy of the oxygen molecule. Relative to most molecules, this ionization energy is very high 1165 kJ/mol.


Structure and molecular properties

O2+ has a bond order of 2.5, and O−O distance of 112.3 pm. It is has the same number of valence electrons as nitric oxide. The bond energy is 625.1 kJ mol−1 and stretching frequency of 1858 cm−1, both of which are high relative to most molecules.


Dioxygenyl hexafluoroplatinate

The reaction of dioxygen, O2, with platinum hexafluoride, PtF6, yields dioxygenyl hexafluoroplatinate, O2[PtF6]:

O2 + PtF6 → O2[PtF6]

PtF6 is one of the few oxidising agents sufficiently powerful to oxidise O2.

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 discovered "xenon hexafluoroplatinate. "

Other compounds

O2+ is also found in the similar compound O2[AsF6], dioxygenyl hexafluoroarsenate.

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Dioxygenyl". A list of authors is available in Wikipedia.
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