Iodine trifluoride

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"IF3" redirects here. IF3 may also refer to the IF3 International Freeski Film Festival.
Iodine trifluoride
Structural formula
Iodine trifluoride molecule
CAS number 22520-96-3 YesY
ChemSpider 10329096 YesY
Jmol-3D images Image 1
Molecular formula IF3
Molar mass 183.9 g/mol
Appearance yellow solid
Melting point decomposes above −28 °C
Related compounds
Other anions iodine trichloride
Other cations bromine trifluoride
Related compounds chlorine trifluoride
iodine pentafluoride
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
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Infobox references

Iodine trifluoride is an interhalogen compound with the chemical formula IF3. It is a yellow solid which decomposes above −28 °C. It can be synthesised from the elements, but care must be taken to avoid the formation of IF5.


F2 reacts with I2 to yield IF3 at −45 °C in CCl3F. Alternatively, at low temperatures, the fluorination reaction I2 + 3XeF2 → 2IF3 + 3Xe can be used. Not much is known about iodine trifluoride as it is so unstable.

Chemical properties[edit]

Iodine trifluoride has five electron pairs, and like chlorine trifluoride is T-shaped as predicted by VSEPR Theory.[1]


  1. ^ Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 0080379419.