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dioxygenyl
The dioxygenyl ion, O2+, is a rarely encountered oxycation in which both oxygen atoms have a formal 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 at 1175 kJ/mol.〔Michael Clugston; Rosalind Flemming (2000). ''Advanced Chemistry'', Oxford University Press, ISBN 0-19-914633-0, ISBN 978-0-19-914633-8, p. 355.〕 As a result, the scope of the chemistry of O2+ is quite limited, acting mainly as a 1-electron oxidiser.
==Structure and molecular properties==
O2+ has a bond order of 2.5, and a bond length of 112.3 pm in solid O2().〔 p. 616〕 It has the same number of valence electrons as nitric oxide and is paramagnetic. The bond energy is 625.1 kJ mol−1 and the stretching frequency is 1858 cm−1, both of which are high relative to most molecules.
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