Dioxidanylium
Ion
From Wikipedia, the free encyclopedia
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.
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| Names | |
|---|---|
| IUPAC name
oxooxidanium | |
| Other names
Hydroperoxy cation; Hydridodioxygen(1+); Dioxidenium; dioxidanylium | |
| Identifiers | |
3D model (JSmol) |
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| ChEBI | |
| ChemSpider | |
| 508 | |
PubChem CID |
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CompTox Dashboard (EPA) |
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| Properties | |
| 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).
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It is the conjugate acid of dioxygen. The proton affinity of dioxygen (O2) is 4.4 eV.[3]
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 HO+
2 should be much more detectable.[4]
Formation
Reaction of dioxygenyl O+
2 with hydrogen:[5]
- O+•
2 + H2 → HO+
2 + H•
The reaction of the trihydrogen cation with dioxygen is approximately thermoneutral:[3]
- O2 + H+
3 → HO+
2 + 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 HO+
2.[6] This reaction also forms hydrogen peroxide (H2O2) and hydrogen tetroxide (H2O4).[7]
Properties
Reactions
Related
The protonated molecular oxygen dimer HO+
4 has a lower energy than that of protonated molecular oxygen.[3]