Iodine heptafluoride

Iodine heptafluoride is an interhalogen compound with the chemical formula IF7. It has an unusual pentagonal bipyramidal structure, with D5h symmetry, as predicted by VSEPR theory. The molecule can undergo a pseudorotational rearrangement called the Bartell mechanism, which is like the Berry mechanism but for a heptacoordinated system.

Iodine heptafluoride
Names
Other names
Iodine(VII) fluoride
Heptafluoroiodine
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.037.241
PubChem CID
UNII
  • InChI=1S/F7I/c1-8(2,3,4,5,6)7 Y
    Key: XRURPHMPXJDCOO-UHFFFAOYSA-N Y
  • InChI=1/F7I/c1-8(2,3,4,5,6)7
    Key: XRURPHMPXJDCOO-UHFFFAOYAO
SMILES
  • FI(F)(F)(F)(F)(F)F
Properties
IF7
Molar mass 259.90 g/mol
Appearance colorless gas
Density 2.6 g/cm3 (6 °C)
2.7 g/cm3 (25 °C)
Melting point 4.5 °C (40.1 °F; 277.6 K) (triple point)
Boiling point 4.8 °C (40.6 °F; 277.9 K) (sublimes at 1 atm)
soluble
Related compounds
Related compounds
 iodine pentafluoride
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

Below 4.5 °C, IF7 forms a snow-white powder of colorless crystals, melting at 5-6 °C. However, this melting is difficult to observe, as the liquid form is thermodynamically unstable at 760 mmHg: instead, the compound begins to sublime at 4.77 °C. The dense vapor has a mouldy, acrid odour.

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