Hydrogen trioxide
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| Names | |
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Preferred IUPAC name
Trioxidane (only preselected name)
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| Other names
Dihydrogen trioxide
Hydrogen trioxide Water-Air Dihydroxy ether |
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| Identifiers | |
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3D model (JSmol)
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| ChEBI | |
| ChemSpider | |
| 200290 | |
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PubChem CID
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| Properties | |
| H2O3 | |
| Molar mass | 50.01 g·mol−1 |
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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 (what is   ?) |
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| Infobox references | |
Trioxidane (also systematically named μ-trioxidanediidodihydrogen), also called hydrogen trioxide or dihydrogen trioxide, is an inorganic compound with the chemical formula H[O]
3H (also written as [H(μ-O
3)H] or [H
2O
3]). It is one of the unstable hydrogen polyoxides (and therefore hydrogen chalcogenides). In aqueous solutions, trioxidane decomposes to form water and singlet oxygen:
The reverse reaction, the addition of singlet oxygen to water, typically does not occur in part due to the scarcity of singlet oxygen. In biological systems, however, ozone is known to be generated from singlet oxygen, and the presumed mechanism is an antibody-catalyzed production of trioxidane from singlet oxygen.
Trioxidane can be obtained in small, but detectable, amounts in reactions of ozone and hydrogen peroxide, or by the electrolysis of water. Larger quantities have been prepared by the reaction of ozone with organic reducing agents at low temperatures in a variety of organic solvents such as the anthraquinone process, and it is also formed during the decomposition of organic hydrotrioxides (ROOOH). Alternatively, trioxidane can be prepared by reduction of ozone with 1,2-diphenylhydrazine at low temperature. Using a resin-bound version of the latter, relatively pure trioxidane can be isolated as a solution in organic solvent. In acetone-d6 at –20 °C, the characteristic 1H NMR signal of trioxidane could be observed at a chemical shift of 13.1 ppm.
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