Iodine trichloride

• ICl3 (monomer)
• ( ICl3 ) 2 ( Dimer )

Red-brown crystals with a pungent odor

Fixed

3.12 g · cm -3

33 ° C

77 ° C ( decomposition)

Risk

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Iodine trichloride is corrosive interhalogen compound consisting of iodine and chlorine. It was shown in 1814 by Humphry Davy.

Production and representation

Trichloride is formed when chlorine is allowed to act on iodine chloride.

Properties

Trichloride is unlike other interhalogens dimers ( ICl3 ) 2 Here are the bond angles and bond lengths are not identical (see figure above ). Trichloride smells pungent and forms yellow needles, which melt in air. It can dissolve well in alcohol, ether and benzene.

With water trichloride reacts to iodine chloride, hydrochloric acid and iodic acid.

Use

Trichloride can be employed in preparative organic chemistry, both for iodination and chlorination, for example for chlorination of aromatics.