Chemistry:Tetraoxidane

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/h1-2H Key: RSPISYXLHRIGJD-UHFFFAOYSA-N
SMILES OOOO
Properties
Chemical formula	H2O4
Molar mass	66.012 g·mol−1
Density	1.8±0.1 g/cm3
Related compounds
Related compounds	Pentaoxidane
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Tetraoxidane is an inorganic compound of hydrogen and oxygen with the chemical formula H₂O₄. This is one of the unstable hydrogen polyoxides.

Synthesis

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

[math]\displaystyle{ \mathrm{2HO_2^\bullet \xrightarrow{} 2H_2O_4} }[/math]

Physical properties

This is the fourth member of the polyoxidanes. The first three are water [(mon)oxidane], hydrogen peroxide (dioxidane), and trioxidane. Tetroxidane is more unstable than the previous compounds. The term "tetraoxidane" extends beyond the parent compound to several daughter compounds of the general formula R₂O₄, 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 tetroxidanes also exist.

Ionization

Tetroxidane autoionizes when in liquid form:

[math]\displaystyle{ \mathrm{H_2O_4 \rightleftarrows H^+ + HO_4^-} }[/math]

[math]\displaystyle{ \mathrm{2H_2O_4 \rightleftarrows H_3O_4^+ + HO_4^-} }[/math]