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| Names | |||
|---|---|---|---|
| IUPAC name Iodine monofluoride | |||
| Other names Iodine fluoride | |||
| Identifiers | |||
3D model (JSmol) | |||
| ChemSpider |
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| Properties | |||
| IF | |||
| Molar mass | 145.903 g/mol | ||
| Appearance | unstable brown solid | ||
| Melting point | −45 °C (−49 °F; 228 K) | ||
| Related compounds | |||
Otheranions | Iodine monochloride Iodine monobromide Astatine monoiodide | ||
Othercations | Chlorine monofluoride Bromine monofluoride | ||
Related compounds | Iodine trifluoride Iodine pentafluoride Iodine heptafluoride | ||
Except where otherwise noted, data are given for materials in theirstandard state (at 25 °C [77 °F], 100 kPa). | |||
Iodine monofluoride is aninterhalogen compound ofiodine andfluorine with formula IF. It is a chocolate-brown solid that decomposes at 0 °C,[1]disproportionating to elemental iodine andiodine pentafluoride:
However, its molecular properties can still be precisely determined byspectroscopy: the iodine-fluorine distance is 190.9 pm and the I−Fbond dissociation energy is around 277 kJ mol−1. At 298 K, itsstandard enthalpy change of formation is ΔfH° = −95.4 kJ mol−1, and itsGibbs free energy is ΔfG° = −117.6 kJ mol−1.
It can be generated, albeit only fleetingly, by the reaction of the elements at −45 °C inCCl3F:
It can also be generated by the reaction of iodine withiodine trifluoride at −78 °C in CCl3F:
The reaction of iodine withsilver(I) fluoride at 0 °C also yields iodine monofluoride:
Iodine monofluoride is used to produce purenitrogen triiodide:[2]
