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Tetraoxidane

Names
IUPAC name Tetraoxidane
Other names Hydroxyperoxide, dihydrogen tetroxide, diperoxide, bisperoxide
Identifiers
CAS Number	29683-94-1
3D model (JSmol)	Interactive image
ChemSpider	4417295
PubChem CID	5250043
InChI InChI=1S/H2O4/c1-3-4-2/h1-2HKey: RSPISYXLHRIGJD-UHFFFAOYSA-N
SMILES OOOO
Properties
Chemical formula	H2O4
Molar mass	66.012 g·mol
Density	1.8±0.1 g/cm
Related compounds
Related compounds	Pentaoxidane
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). Infobox references

Tetraoxidane is an inorganic compound of hydrogen and oxygen with the chemical formula H
₂O
₄. This is one of the unstable hydrogen polyoxides.

Synthesis

The compound is prepared by a chemical reaction between hydroperoxyl radicals (HOO•) at low temperatures:

2 HOO• ⇌ H₂O₄

Physical properties

This is the fourth member of the polyoxidanes. The first three are water , hydrogen peroxide (dioxidane), and trioxidane. Tetraoxidane is more unstable than the previous compounds. The term "tetraoxidane" extends beyond the parent compound to several daughter compounds of the general formula R
₂O
₄, where R can be hydrogen, halogen atoms, or various inorganic and organic monovalent radicals. The two Rs together can be replaced by a divalent radical, so heterocyclic tetraoxidanes also exist.

Ionization

Tetraoxidane autoionizes when in liquid form:

H₂O₄ ⇌ H + HO−4

2 H₂O₄ ⇌ H₃O+4 + HO−4

References

1. Mckay, Daniel J.; Wright, James S. (1 February 1998). "How Long Can You Make an Oxygen Chain?". Journal of the American Chemical Society. 120 (5): 1003–1013. doi:10.1021/ja971534b. ISSN 0002-7863. Retrieved 16 May 2023.
2. "hydroxyperoxide". ChemScr. Retrieved 15 May 2023.
3. The Chemistry of Peroxides, Volume 3. John Wiley & Sons. 20 April 2015. p. 198. ISBN 978-1-118-41271-8. Retrieved 15 May 2023.
4. "Selected ATcT [1, 2] enthalpy of formation based on version 1.122 of the Thermochemical Network [3]". atct.anl.gov. Retrieved 15 May 2023.
5. Levanov, Alexander V.; Sakharov, Dmitri V.; Dashkova, Anna V.; Antipenko, Ewald E.; Lunin, Valeri V. (2011). "Synthesis of Hydrogen Polyoxides H2O4 and H2O3 and Their Characterization by Raman Spectroscopy". European Journal of Inorganic Chemistry. 2011 (33): 5144–5150. doi:10.1002/ejic.201100767.
6. Möller, Detlev (19 February 2019). Fundamentals and Processes. Walter de Gruyter GmbH & Co KG. p. 276. ISBN 978-3-11-056126-5. Retrieved 15 May 2023.
7. Curutchet, Antton; Colinet, Pauline; Michel, Carine; Steinmann, Stephan N.; Le Bahers, Tangui (2020). "Two-sites are better than one: revisiting the OER mechanism on CoOOH by DFT with electrode polarization" (PDF). Physical Chemistry Chemical Physics. 22 (13): 7031–7038. Bibcode:2020PCCP...22.7031C. doi:10.1039/D0CP00281J. PMID 32195492. S2CID 213191538. Retrieved 15 May 2023.

• Inorganic compounds
• Oxides
• Polyoxides
• Oxoacids