Dioxidanylium

Dioxidanylium
Names
	IUPAC name oxooxidanium
	Other names Hydroperoxy cation; Hydridodioxygen(1+); Dioxidenium; dioxidanylium
Identifiers
CAS Number	71722-67-3;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:29793;
ChemSpider	4574078;
Gmelin Reference	508
PubChem CID	5460577;
	InChI InChI=1S/O2/c1-2/p+1 Key: MYMOFIZGZYHOMD-UHFFFAOYSA-O;
	SMILES [OH+]=O;
Properties
Chemical formula	HO2+
Molar mass	33.005 g·mol−1
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Dioxidanylium, which is protonated molecular oxygen, or just protonated oxygen, is an ion with formula HO⁺
₂. It is formed when hydrogen containing substances combust, and exists in the ionosphere, and in plasmas that contain oxygen and hydrogen. Oxidation by O₂ in superacids could be by way of the production of protonated molecular oxygen.

It is the conjugate acid of dioxygen. The proton affinity of dioxygen (O₂) is 4.4 eV.

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