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|Molar mass||145.903 g/mol|
|Appearance||unstable brown solid|
|Melting point||−45 °C (−49 °F; 228 K)|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
|what is ?)(|
Iodine monofluoride is an interhalogen compound of iodine and fluorine with formula IF. It is a chocolate-brown solid that decomposes at 0 C, disproportionating to elemental iodine and iodine pentafluoride:
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:
It can also be generated by the reaction of iodine with iodine trifluoride at −78 °C in CCl3F:
The reaction of iodine with silver(I) fluoride at 0 °C also yields iodine monofluoride:
Iodine monofluoride is used to produce pure nitrogen triiodide:
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