Chlorine peroxide

Names
IUPAC name

Chlorine peroxide

Other names

Chlorine(I) oxide; ClO dimer

Identifiers

CAS Number

* 12292-23-8

3D model (JSmol)

* Interactive image

ChemSpider |

* 109895

PubChem CID

* 123287

InChI

* InChI=1S/Cl2O2/c1-3-4-2

Key: MAYPHUUCLRDEAZ-UHFFFAOYSA-N

* InChI=1/Cl2O2/c1-3-4-2

Key: MAYPHUUCLRDEAZ-UHFFFAOYAP

SMILES

* ClOOCl

Properties

Chemical formula

| Cl2O2
Molar mass | 102.905 g/mol

Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Infobox references

Tracking categories (test):

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Chlorine peroxide (also known as dichlorine dioxide or ClO dimer) is a molecular compound with formula ClOOCl.[1] Chemically, it is a dimer of the chlorine monoxide radical (ClO·). It is important in the formation of the ozone hole.[2] Chlorine peroxide catalytically converts ozone into oxygen when it is irradiated by ultraviolet light.[3]

## Production

Chlorine peroxide can be produced by laser or ultraviolet photolysis of the chlorine molecule with ozone.[1] The lasers used to break up the chlorine molecule into atoms can be an excimer laser at 248, 308, or 352 nm wavelength.[3] Difluorodichloromethane (CF2Cl2) can also act as a source of chlorine atoms for the formation of the peroxide.[1] Microwave discharge can also break up chlorine molecules into atoms that react with ozone to make chlorine peroxide.[3]

Cl2 \+ hν → 2Cl
Cl + O3 → O2 \+ ClO·
2ClO· + M → ClOOCl + M
ClOOCl + hν → Cl + ClO2
ClO2 \+ M → Cl + O2 \+ M

## Properties

Chlorine peroxide absorbs ultraviolet light with a maximum absorbing wavelength of 245 nm. It also absorbs longer wavelengths up to 350 nm to a lesser extent. This is important as ozone absorbs up to 300 nm.[1]

The Cl−O bond length is 1.704 Å, and the O−O bond is 1.426 Å long.[4] The ClOO bond angle is 110.1°, and the dihedral angle between the two Cl−O−O planes is 81°[4]

## References

1. ↑ 1.0 1.1 1.2 1.3 Pope, Francis D.; Jaron C. Hansen; Kyle D. Bayes; Randall R. Friedl; Stanley P. Sander (2007). "Ultraviolet Absorption Spectrum of Chlorine Peroxide, ClOOCl". The Journal of Physical Chemistry A 111 (20): 4322–4332. doi:10.1021/jp067660w. ISSN 1089-5639. PMID 17474723. Bibcode: 2007JPCA..111.4322P.
2. ↑ Lin, Jim J.; Andrew F Chen; Yuan T. Lee (2011). "UV Photolysis of ClOOCl and the Ozone Hole". Chemistry: An Asian Journal 6 (7): 1664–1678. doi:10.1002/asia.201100151. ISSN 1861-4728. PMID 21538907. http://ntur.lib.ntu.edu.tw/bitstream/246246/239120/-1/106.pdf.
3. ↑ 3.0 3.1 3.2 "UV Absorption Cross Sections of ClOOCl Are Consistent with Ozone Degradation Models". Science 324 (5928): 781–784. 2009. doi:10.1126/science.1171305. ISSN 0036-8075. PMID 19423825. Bibcode: 2009Sci...324..781C.
4. ↑ 4.0 4.1 Inglese, S.; G. Granucci; T. Laino; M. Persico (2005). "Photodissociation Dynamics of Chlorine Peroxide Adsorbed on Ice". The Journal of Physical Chemistry B 109 (16): 7941–7947. doi:10.1021/jp044368k. ISSN 1520-6106. PMID 16851927.

* v
* t
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Chlorine compounds

* ClF
* ClF3
* ClF5
* ClNO3
* ClO
* ClOF3
* Cl2O2
* ClO2
* ClO2F
* ClO3F
* Cl2O
* Cl2O4
* Cl2O6
* Cl2O7
* HCl
* SiCl4

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