Superoxide

Base Information

• Chemical Name: Superoxide
• CAS No.: 11062-77-4
• Molecular Formula: O2
• Molecular Weight: 31.9988
• DSSTox Substance ID: DTXSID30891408
• Wikipedia: Superoxide ion,Superoxide
• NCI Thesaurus Code: C852
• Mol file: 11062-77-4.mol

Synonyms:Superoxide;Superoxide Anion;Superoxide Radical;Superoxides

Chemical Property of Superoxide

Chemical Property:

• Boiling Point: 150.2°Cat760mmHg
• Flash Point: °C
• PSA: 23.06000
• Density: g/cm³
• LogP: -0.23760
• XLogP3: -1
• Hydrogen Bond Donor Count: 0
• Hydrogen Bond Acceptor Count: 1
• Rotatable Bond Count: 0
• Exact Mass: 31.989829239
• Heavy Atom Count: 2
• Complexity: 0

Purity/Quality:

98%,99%, ^*data from raw suppliers

Safty Information:

• Pictogram(s):  
• Hazard Codes: 

MSDS Files:

SDS file from LookChem

Useful:

• Canonical SMILES: [O-][O]
• Description: A compound characterized by the presence in its structure of the O2? ion. The O2? ion has an odd number of electrons (17) and as a result all superoxide compounds are paramagnetic. At room temperature they have a yellowish color. At low temperature many of them undergo reversible phase transitions accompanied by a color change to white. The stable superoxides are sodium superoxide NaO2 potassium superoxide KO2 rubidium superoxide RbO2 cesium superoxide CsO2 calcium superoxide Ca(O2)2 strontium superoxide Sr(O2)2 barium superoxide Ba(O2)2 tetramethylammonium superoxide (CH3)4NO2 In these compounds each oxygen atom has an oxidation number of ?1/2 instead of ?2, as a normal oxide. A product of the univalent reduction of O2 or the univalent oxidation of H2O2. The superoxide radical (O22 ) or its corresponding acid (perhydroxyl radical, HO2; pKa 5 4.8) is generated both enzymatically and nonenzymatically in biological systems. Superoxide can also be produced by cathodic reduction of O2 in an aprotic solvent, as well as by ultrasonication, pulse radiolysis, or photolysis of water. By virtue of a relatively negative dioxygen/superoxide couple (Eo0 5 20.31 V) superoxide is a stronger reductant than it is an oxidant (i.e., it readily reduces oxidized cytochrome C). Detection methods include optical spectroscopy, electron spin resonance, mass spectrometry, and detection of its presence based on its ability to reduce readily measurable oxidants such as cytochrome c or tetrazolium salts. Due to its reductive ability as well as the spontaneous disproportionation that proceeds with a rate constant of about 105 M21 sec21 (O22 1 O22 1 2H1-H2O2 1 O2), the steady-state concentrations of the oxyradicals are usually low at physiological conditions.