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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 Ã‚°C, disproportionating to elemental iodine and iodine pentafluoride:

5 IF → 2 I<sub>2</sub> + IF<sub>5</sub>

However, its molecular properties can still be precisely determined by spectroscopy: the iodine-fluorine distance is 190.9&nbsp;pm and the I−F bond dissociation energy is around 277&nbsp;kJ&nbsp;mol<sup>−1</sup>. At 298&nbsp;K, its standard enthalpy change of formation is Δ<sub>f</sub>H° = −95.4&nbsp;kJ&nbsp;mol<sup>−1</sup>, and its Gibbs free energy is Δ<sub>f</sub>G° = −117.6&nbsp;kJ&nbsp;mol<sup>−1</sup>.

It can be generated, albeit only fleetingly, by the reaction of the elements at −45&nbsp;°C in CCl<sub>3</sub>F:

I<sub>2</sub> + F<sub>2</sub> → 2 IF

It can also be generated by the reaction of iodine with iodine trifluoride at −78&nbsp;°C in CCl<sub>3</sub>F:

I<sub>2</sub> + IF<sub>3</sub> → 3 IF

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

I<sub>2</sub> + AgF → IF + AgI

Reactions

Iodine monofluoride is used to produce pure nitrogen triiodide:

BN + 3 IF → NI<sub>3</sub> + BF<sub>3</sub>

See also

References