Dichlorine heptoxide

Dichlorine heptoxide
Names
	IUPAC name Dichlorine heptoxide
	Other names Chlorine(VII) oxide; Perchloric anhydride; (Perchloryloxy)chlorane trioxide
Identifiers
CAS Number	12015-53-1 ;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:52356 ;
ChemSpider	109884 ;
PubChem CID	123272;
UNII	22MM1X86NB ;
CompTox Dashboard (EPA)	DTXSID90152704 ;
	InChI InChI=1S/Cl2O7/c3-1(4,5)9-2(6,7)8 Key: SCDFUIZLRPEIIH-UHFFFAOYSA-N ; InChI=1.001/Cl2O7/c3-1(4,5)9-2(6,7)8 Key: SCDFUIZLRPEIIH-UHFFFAOYAG;
	SMILES O=Cl(=O)(=O)OCl(=O)(=O)=O;
Properties
Chemical formula	Cl2O7
Molar mass	182.901 g/mol
Appearance	colorless liquid, colorless gas
Density	1.9 g/cm3
Melting point	−91.57 °C (−132.83 °F; 181.58 K)
Boiling point	82.07 °C (179.73 °F; 355.22 K)
Solubility in water	hydrolyzes to form perchloric acid
Thermochemistry
Std enthalpy of; formation (ΔfH⦵298)	275.7 kJ/mol
Hazards
	Occupational safety and health (OHS/OSH):
Main hazards	oxidizer, contact explosive
NFPA 704 (fire diamond)	3 0 3 OX
Related compounds
Related compounds	Manganese heptoxide
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Dichlorine heptoxide is the chemical compound with the formula Cl₂O₇. This chlorine oxide is the anhydride of perchloric acid. It is produced by the careful distillation of perchloric acid in the presence of the dehydrating agent phosphorus pentoxide:

2 HClO₄ + P₄O₁₀ → Cl₂O₇ + H₂P₄O₁₁

The chlorine(VII) oxide can be distilled off from the mixture.

It may also be formed by illumination of mixtures of chlorine and ozone with blue light. It slowly hydrolyzes back to perchloric acid.

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