Iodine trichloride

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Iodine trichloride
Full structural formula of the dimer
Space-filling model of the dimer
Commercial sample of iodine trichloride
IUPAC name
iodine trichloride
3D model (JSmol)
ECHA InfoCard 100.011.582
Molar mass 466.5281 g/mol
Appearance yellow solid
Density 3.11 g/cm3
Melting point 63 °C (145 °F; 336 K)
−90.2·10−6 cm3/mol
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Iodine trichloride is an interhalogen compound of iodine and chlorine. It is bright yellow and in the solid state is present as a planar dimer I2Cl6, Cl2I(μ-Cl)2ICl2, with two bridging Cl atoms.[1]

It can be prepared by reacting iodine with an excess of liquid chlorine at −70 °C. In the molten state it is conductive, which may indicate dissociation:[2]

I2Cl6 ⇌ ICl2+ + ICl4

Iodine trichloride can be created by heating a mixture of liquid iodine and chlorine gas to 105 °C.

It is an oxidizing agent, capable of causing fire on contact with organic materials.


  1. ^ K. H. Boswijk; E. H. Wiebenga (1954). "The crystal structure of I2Cl6 (ICl3)". Acta Crystallographica. 7 (5): 417–423. doi:10.1107/S0365110X54001260.
  2. ^ Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 978-0-08-037941-8.