Dichlorine monoxide

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Dichlorine monoxide
IUPAC name Oxygen dichloride[note 1]
Other names Chlorine(I) oxide
Hypochlorous anhydride
Dichlorooxidane
Dichloridooxygen
Identifiers
InChI InChI=1/Cl2O/c1-3-2
InChIKey RCJVRSBWZCNNQT-UHFFFAOYAA
Standard InChI InChI=1S/Cl2O/c1-3-2
Standard InChIKey RCJVRSBWZCNNQT-UHFFFAOYSA-N
CAS number [7791-21-1]
EC number 232-243-5
ChemSpider 23048
Properties[3][4]
Chemical formula Cl2O
Molar mass 86.905 g mol−1
Appearance yellow-brown gas
Melting point

−120.6 °C (152.6 K)

Boiling point

2.0 °C (275.2 K)

Structure[5]
Molecular geometry bent: r(Cl–O) = 170.13 pm, θ(Cl–O–Cl) = 110.89°
Thermochemistry[6]
Std enthalpy of formation ΔfHo298 +87.86 kJ mol−1
Standard molar entropy So298 267.89 J K−1 mol−1
Related compounds
Other cations Difluorine monoxide
Dibromine monoxide
Other oxides of chlorine Chlorine dioxide
Dichlorine hexaoxide
Dichlorine heptaoxide
Other compounds Hypochlorous acid
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)

Dichlorine monoxide, Cl2O, is a binary compound of oxygen and chlorine.

Notes and references

Notes

  1. Although oxygen is more electronegative than chlorine on the normal numerical scales,[1] it appears after the halogens on the conventional electronegativity series used in inorganic nomenclature.[2] Hence, OCl2 is considered a chloride of oxygen, and not an oxide of chlorine, for nomenclature purposes.

References

  1. Allred, A. L. Electronegativity values from thermochemical data. J. Inorg. Nucl. Chem. 1961, 17 (3–4), 215–21. DOI: 10.1016/0022-1902(61)80142-5.
  2. Nomenclature of Inorganic Chemistry; IUPAC Recommendations 2005; Royal Society of Chemistry: Cambridge, 2005; p 260. ISBN 0-85404-438-8, <http://www.iupac.org/publications/books/rbook/Red_Book_2005.pdf>.
  3. Greenwood, Norman N.; Earnshaw, A. Chemistry of the Elements; Pergamon: Oxford, 1984; pp 989–90. ISBN 0-08-022057-6.
  4. CRC Handbook of Chemistry and Physics, 62nd ed.; Weast, Robert C., Ed.; CRC Press: Boca Raton, FL, 1981; p B-93. ISBN 0-8493-0462-8.
  5. Xu, Yunjie; McKellar, A. R. W.; Burkholder, James B.; Orlando, J. J. High-Resolution Infrared Spectrum of the ν1 and ν3 Bands of Dichlorine Monoxide, Cl2O. J. Mol. Spectrosc. 1996, 175 (1), 68–72. DOI: 10.1006/jmsp.1996.0010.
  6. Dichlorine monoxide. In NIST Chemistry WebBook; National Institute for Standards and Technology, <http://webbook.nist.gov/cgi/inchi/InChI%3D1S/Cl2O/c1-3-2>. (accessed 31 December 2010).

External links

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