Dioxidanylium

Dioxidanylium^[1]
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;
CompTox Dashboard (EPA)	DTXSID601336127 ;
	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.^[2] 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.^[3]

^ "HO2+". webbook.nist.gov.
^ Robbe, J.M.; Monnerville, M.; Chambaud, G.; Rosmus, P.; Knowles, P.J. (January 2000). "Theoretical spectroscopic data of the HO⁺
₂ ion". Chemical Physics. 252 (1–2): 9–16. Bibcode:2000CP....252....9R. doi:10.1016/S0301-0104(99)00350-X.
^ Xavier, George D.; Bernal-Uruchurtu, Margarita I.; Hernández-Lamoneda, Ramón (28 August 2014). "Communication: study of O₄H⁺: A tracer molecule in the interstellar medium?". The Journal of Chemical Physics. 141 (8): 081101. doi:10.1063/1.4894068. PMID 25172995.

[1] "HO2+". webbook.nist.gov.

[Robbe000-2] Robbe, J.M.; Monnerville, M.; Chambaud, G.; Rosmus, P.; Knowles, P.J. (January 2000). "Theoretical spectroscopic data of the HO⁺
₂ ion". Chemical Physics. 252 (1–2): 9–16. Bibcode:2000CP....252....9R. doi:10.1016/S0301-0104(99)00350-X.

[xav-3] Xavier, George D.; Bernal-Uruchurtu, Margarita I.; Hernández-Lamoneda, Ramón (28 August 2014). "Communication: study of O₄H⁺: A tracer molecule in the interstellar medium?". The Journal of Chemical Physics. 141 (8): 081101. doi:10.1063/1.4894068. PMID 25172995.

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