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'Dichlorine monoxide'
Structure of the chlorine dioxide molecule Dichlorine monoxide
Molecular formula	Cl2O
Molar mass	86.9054 g mol−1
CAS number	[7791-21-1]
Density	?
Solubility (water)	hydrolyses
Melting point	−120.6 °C
Boiling point	22 °C
Dipole moment	0.78 ± 0.08 D
'Thermodynamic data'
Standard enthalpy of formation ΔfH°solid	+80.3 kJ mol−1
Standard molar entropy S°solid	265.9 J K−1 mol−1
'Safety data'
EU classification	?
R-phrases	?
S-phrases	?
Related compounds
Related oxides	H2O F2O
Other chlorine oxides	ClO2 Cl2O7

'Dichlorine monoxide', Cl₂O, is a chlorine oxide.
Dichlorine monoxide is the anhydride of hypochlorous acid; it is related to hypochlorites generally.
It is also the unstable decomposition product of calcium hypochlorite, and in high concentrations presents the risk of ignition by friction or static spark.

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