Dioxidanylium
Ion From Wikipedia, the free encyclopedia
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.
Names | |
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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]
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]
Reaction of dioxygenyl O+
2 with hydrogen:[5]
The reaction of the trihydrogen cation with dioxygen is approximately thermoneutral:[3]
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]
In the infrared spectrum HO+
2 the v1 band due to vibrating O–H has a band head at 3016.73 cm−1.[8]
A helium complex (He–O2H+) also is known.[8]
HO+
2 appears to react rapidly with hydrogen:[9]
HO+
2 also reacts with dinitrogen and water:[9]
The protonated molecular oxygen dimer HO+
4 has a lower energy than that of protonated molecular oxygen.[3]
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