Английская Википедия:Dioxidanylium

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Шаблон:Short description

Шаблон:Chembox Dioxidanylium, which is protonated molecular oxygen, or just protonated oxygen, is an ion with formula Шаблон:Chem. It is formed when hydrogen containing substances combust, and exists in the ionosphere, and in plasmas that contain oxygen and hydrogen.[1] 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.[2]

Significance

Protonated molecular oxygen is of interest in trying to detect dioxygen in space. Because Earth's atmosphere is full of O2, its spectrum from a space object is impossible to observe from the ground. However Шаблон:Chem should be much more detectable.[3]

Formation

Reaction of dioxygenyl Шаблон:Chem with hydrogen:[4]

Шаблон:Chem + H2Шаблон:Chem + H

The reaction of the trihydrogen cation with dioxygen is approximately thermoneutral:[2]

O2 + Шаблон:ChemШаблон:Chem + H2

When atomic hydrogen, created in an electric discharge is rapidly cooled with oxygen and condensed in solid neon, several reactive ions and molecules are produced. These include HO2 (hydroperoxyl), HOHOH, H2O(HO), HOHO as well as Шаблон:Chem.[5] This reaction also forms hydrogen peroxide (H2O2) and hydrogen tetroxide (H2O4).[6]

Properties

In the infrared spectrum Шаблон:Chem the v1 band due to vibrating O–H has a band head at 3016.73 cm−1.[7]

Reactions

A helium complex (He–O2H+) also is known.[7]

Шаблон:Chem appears to react rapidly with hydrogen:[8]

Шаблон:Chem + H2 → O2 + Шаблон:Chem

Шаблон:Chem also reacts with dinitrogen and water:[8]

Шаблон:Chem + H2O → O2 + H3O+

Related

The protonated molecular oxygen dimer Шаблон:Chem has a lower energy than that of protonated molecular oxygen.[2]

References

Шаблон:Reflist