Iodine heptafluoride

Names

Other names

Iodine(VII) fluoride
Heptafluoroiodine

Identifiers

CAS Number

16921-96-3^Y

3D model (Jmol)

21477354^Y

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

Chemical formula

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)

Solubility in water

soluble

Related compounds

iodine pentafluoride

Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

(what is ^YN ?)

Infobox references

Iodine heptafluoride, also known as iodine(VII) fluoride or iodine fluoride, is an interhalogen compound with the chemical formula I F₇. It has an unusual pentagonal bipyramidal structure, 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. It forms colourless crystals, which melt at 4.5 °C: the liquid range is extremely narrow, with the boiling point at 4.77 °C. The dense vapor has a mouldy, acrid odour. The molecule has D_5h symmetry.

IF₇ is prepared by passing F₂ through liquid IF₅ at 90 °C, then heating the vapours to 270 °C. Alternatively, this compound can be prepared from fluorine and dried palladium or potassium iodide to minimize the formation of IOF₅, an impurity arising by hydrolysis.

IF₇ is highly irritating to both the skin and the mucous membranes. It also is a strong oxidizer and can cause fire on contact with organic material.

...
Wikipedia