Iodine monofluoride

Iodine monofluoride is an interhalogen compound of iodine and fluorine with formula IF. It is a chocolate-brown solid that decomposes at 0 °C,[1] disproportionating to elemental iodine and iodine pentafluoride:

5 IF → 2 I2 + IF5
Iodine monofluoride
Names
IUPAC name
Iodine monofluoride
Other names
Iodine fluoride
Identifiers
3D model (JSmol)
ChemSpider
Properties
IF
Molar mass 145.903 g/mol
Appearance unstable brown solid
Melting point −45 °C (−49 °F; 228 K)
Related compounds
Other anions
 Iodine monochloride
Iodine monobromide
Astatine monoiodide
Other cations
 Chlorine monofluoride
Bromine monofluoride
Astatine monofluoride
Related compounds
 Iodine trifluoride
Iodine pentafluoride
Iodine heptafluoride
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

However, its molecular properties can still be precisely determined by spectroscopy: the iodine-fluorine distance is 190.9 pm and the I−F bond dissociation energy is around 277 kJ mol−1. At 298 K, its standard enthalpy change of formation is ΔHf° = −95.4 kJ mol−1, and its Gibbs free energy is ΔGf° = −117.6 kJ mol−1.

It can be generated, albeit only fleetingly, by the reaction of the elements at −45 °C in CCl3F:

I2 + F2 → 2 IF

It can also be generated by the reaction of iodine with iodine trifluoride at −78 °C in CCl3F:

I2 + IF3 → 3 IF

The reaction of iodine with silver(I) fluoride at 0 °C also yields iodine monofluoride:

I2 + AgF → IF + AgI

Reactions

Iodine monofluoride is used to produce pure nitrogen triiodide:

BN + 3 IF → NI3 + BF3
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See also

References
  1. Eagleson, Mary (1994). Concise Encyclopedia of Chemistry. Walter de Gruyter. ISBN 978-3-11-011451-5.
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