3D model (JSmol)
CompTox Dashboard (EPA)
|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 ?Hf° = -95.4 kJ mol-1, and its Gibbs free energy is ?Gf° = -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: