Hydroperoxyl

The hydroperoxyl radical, also known as the hydrogen superoxide, is the protonated form of superoxide with the chemical formula HO2, also written HOO•. This species plays an important role in the atmosphere and as a reactive oxygen species in cell biology.

This article is about the radical compound. For hydroperoxide compounds (ROOH) or the anion (OOH−), see Hydroperoxide.
Hydroperoxyl
Names
Preferred IUPAC name
Hydroperoxyl
Systematic IUPAC name
Dioxidanyl
Other names
Peroxyl radical, hydrogen superoxide, hydrogen dioxide
Identifiers
3D model (JSmol)
ChEBI
ChemSpider
506
PubChem CID
  • InChI=1S/HO2/c1-2/h1H Y
    Key: OUUQCZGPVNCOIJ-UHFFFAOYSA-N Y
SMILES
  • [O]O
Properties
HO2
Molar mass 33.006 g·mol−1
Acidity (pKa) 4.88
Basicity (pKb) 9.12 (basicity of superoxide ion)
Conjugate base Superoxide anion
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references
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