What is dioxygen?

Some articles on dioxygen:

Tryptophan 2,3-dioxygenase - Enzyme Mechanism
... formation of the ternary complex (1) occurs by substrate binding, followed by dioxygen binding to the ferrous protein ... mechanisms are possible base-catalysed deprotonation or proton abstraction by bound dioxygen ... However, catalysis by the ironbound dioxygen is generally proposed, as a result of experiments showing that catalytic activity is maintained upon substitution of alanine for His55 (the ...
Molecular Orbital Diagram - Examples of Diatomic MO Diagrams - Dioxygen MO Diagram
... MO treatment of dioxygen is different from that of the previous diatomic molecules because the pσ MO is now lower in energy than the 2π orbitals ... electrons have the same spin, this type of dioxygen called triplet oxygen is a paramagnetic diradical ...
Combustion - Reaction Mechanism
... is explained by the unusual structure of the dioxygen molecule ... The lowest-energy configuration of the dioxygen molecule is a stable, relatively unreactive diradical in a triplet spin state ...
Superoxides
... important as the product of the one-electron reduction of dioxygen O2, which occurs widely in nature ... Whereas molecular oxygen (dioxygen) is a diradical containing two unpaired electrons, the addition of a second electron fills one of its two degenerate molecular orbitals leaving a charged ionic species with ... Both dioxygen and superoxide ion are free radicals that exhibit paramagnetism ...