Chlorine perchlorate

Chlorine perchlorate
IUPAC name Chlorine perchlorate
Systematic name Chloro perchlorate[1]
Other names Chlorine (I,VII) oxide Dichlorine tetroxide
Identifiers
CAS number	27218-16-2 Y
PubChem	168667
ChemSpider	147540 N
Jmol-3D images	Image 1
SMILES ClO[Cl](=O)(=O)=O
InChI InChI=1S/Cl2O4/c1-6-2(3,4)5 N Key: JRONPIZRZBBOBR-UHFFFAOYSA-N N
Properties
Molecular formula	Cl2O4
Molar mass	134.9 g mol−1
Exact mass	133.917363902 g mol-1
Appearance	Pale, green liquid
Density	1.81 g cm-3
Melting point	-117 °C, 156 K, -179 °F
Solubility in water	Reacts
Hazards
Main hazards	oxidizer
N perchlorate (verify) (what is: Y/N?) Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Chlorine perchlorate is the chemical compound with the formula Cl₂O₄. This chlorine oxide is an asymmetric oxide, with one chlorine atom in oxidation state +1 and the other +7, with proper formula ClOClO₃. It is produced by the photolysis of chlorine dioxide at room temperature with 436 nm ultraviolet light:^[2][3]

2 ClO₂ → ClOClO₃

Chlorine perchlorate can also be made the following reactions at -45°C.

CsClO₄ + ClOSO₂F → Cs(SO₃)F + ClOClO₃

Chlorine perchlorate is a pale greenish liquid which decomposes at room temperature.

Properties

It is less stable than ClO₂ and decomposes to O₂, Cl₂ and Cl₂O₆ at room temperature.

2 ClOClO₃ → O₂ + Cl₂ + Cl₂O₆

Chlorine perchlorate reacts with metal chlorides forming anhydrous perchlorates:

CrO₂Cl₂ + 2 ClOClO₃ → 2 Cl₂ + CrO₂(ClO₄)₂

TiCl₄ + 4 ClOClO₃ → 4 Cl₂ + Ti(ClO₄)₄

References

1. ^ "Chloro Perchlorate - PubChem Public Chemical Database". The PubChem Project. USA: National Center for Biotechnology Information. http://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?cid=168667. 
2. ^ A. J. Schell-Sorokin, D. S. Bethune, J. R. Lankard, M. M. T. Loy, P. P. Sorokin (1982). "Chlorine perchlorate a major photolysis product of chlorine dioxide". J. Phys. Chem. 86 (24): 4653–4655. doi:10.1021/j100221a001. 
3. ^ M. I. Lopez, J. E. Sicre (1988). "Ultraviolet spectrum of chlorine perchlorate". J. Phys. Chem. 92 (2): 563–564. doi:10.1021/j100313a062.