Dioxygenyl

Dioxygenyl
Names
	IUPAC name Dioxygenyl
Identifiers
CAS Number	12185-07-8 ;
ChEBI	CHEBI:29372;
ChemSpider	4574103;
	InChI InChI=1S/O2/c1-2/q+1 Key: KMHJKRGRIJONSV-UHFFFAOYSA-N;
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

The dioxygenyl ion, O⁺
₂, is a rarely-encountered oxycation in which both oxygen atoms have a formal oxidation state of $+.mw-parser-output .sfrac{white-space:nowrap}.mw-parser-output .sfrac.tion,.mw-parser-output .sfrac .tion{display:inline-block;vertical-align:-0.5em;font-size:85%;text-align:center}.mw-parser-output .sfrac .num{display:block;line-height:1em;margin:0.0em 0.1em;border-bottom:1px solid}.mw-parser-output .sfrac .den{display:block;line-height:1em;margin:0.1em 0.1em}.mw-parser-output .sr-only{border:0;clip:rect(0,0,0,0);clip-path:polygon(0px 0px,0px 0px,0px 0px);height:1px;margin:-1px;overflow:hidden;padding:0;position:absolute;width:1px}1/2$ . It is formally derived from oxygen by the removal of an electron:

O₂ → O⁺
₂ + 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. As a result, the scope of the chemistry of O⁺
₂ is quite limited, acting mainly as a 1-electron oxidiser.

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