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Iodine heptafluoride

Names
Other names iodine fluoride heptafluoroiodine
Identifiers
CAS Number	16921-96-3
3D model (JSmol)	Interactive image
ChemSpider	21477354
ECHA InfoCard	100.037.241
PubChem CID	85645
CompTox Dashboard (EPA)	DTXSID8066133
InChI InChI=1S/F7I/c1-8(2,3,4,5,6)7Key: XRURPHMPXJDCOO-UHFFFAOYSA-N InChI=1/F7I/c1-8(2,3,4,5,6)7Key: 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/cm (6 °C) 2.7 g/cm (25 °C)
Melting point	4.5°C (triple point)
Boiling point	4.8°C (sublimes at 1 atm)
Solubility in water	soluble
Related compounds
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). Y verify (what is  ?) Infobox references

Iodine heptafluoride, also known as iodine(VII) fluoride or even iodine fluoride, is an interhalogen compound with chemical formula IF₇. 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 hepta coordinated 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.

Preparation

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

Safety considerations

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.

References

1. Pradyot Patnaik. Handbook of Inorganic Chemicals. McGraw-Hill, 2002, ISBN 0070494398
2. Macintyre, J. E. (Ed.). (1992). Dictionary of Inorganic Compounds (Vol. 3). London: Chapman & Hall.
3. O'Neil, Maryadele J. (Ed.). (2001). The Merck Index (13th ed.). Whitehouse Station, NJ: Merck.
4. K. O. Christe, E. C. Curtis, D. A. Dixon (1993). "On the problem of heptacoordination: vibrational spectra, structure, and fluxionality of iodine heptafluoride". Industrial & Engineering Chemistry. 115 (4): 1520–1526. doi:10.1021/ja00057a044.{{cite journal}}: CS1 maint: multiple names: authors list (link)
5. W. J. Adams, H. Bradford Thompson, L. S. Bartell (1970). "Structure, Pseudorotation, and Vibrational Mode Coupling in IF₇: An Electron Diffraction Study". Journal of Chemical Physics. 53 (10): 4040–4046. doi:10.1063/1.1673876.{{cite journal}}: CS1 maint: multiple names: authors list (link)
6. W. C. Schumb, M. A. Lynch, Jr. (1950). "Iodine Heptafluoride". Industrial & Engineering Chemistry. 42 (7): 1383–1386. doi:10.1021/ie50487a035.{{cite journal}}: CS1 maint: multiple names: authors list (link)
7. Ruff O., Keim R. (1930). ""Das Jod-7-fluorid" (The iodine-7-fluoride)". Zeitschrift für Anorganische und Allgemeine Chemie. 193 (1/2): 176–186. doi:10.1002/zaac.19301930117.

External links

• WebBook page for IF7
• National Pollutant Inventory - Fluoride and compounds fact sheet
• web elements listing

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• Oxidizing agents
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