Iodine monofluoride

Iodine monofluoride

Names
IUPAC name Iodine monofluoride
Other names Iodine fluoride
Identifiers
CAS Number	13873-84-2 Y
3D model (JSmol)	Interactive image
ChemSpider	123150 N
PubChem CID	139637
CompTox Dashboard (EPA)	DTXSID50160764
InChI InChI=1S/FI/c1-2 N Key: PDJAZCSYYQODQF-UHFFFAOYSA-N N InChI=1/FI/c1-2 Key: PDJAZCSYYQODQF-UHFFFAOYAT
SMILES FI
Properties
Chemical formula	FI
Molar mass	145.903 g/mol
Appearance	unstable brown solid
Melting point	−45 °C (−49 °F; 228 K)
Related compounds
Other anions	iodine monochloride
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). N verify (what is YN ?) Infobox references

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:

5 IF → 2 I₂ + IF₅

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 ΔH_f° = −95.4 kJ mol⁻¹, and its Gibbs free energy is ΔG_f° = −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

See also

• Iodine trifluoride
• Iodine pentafluoride
• Iodine heptafluoride