Iodine heptafluoride
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| Iodine heptafluoride | |
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| Systematic name | iodine(VII) fluoride iodine heptafluoride |
| Other names | iodine fluoride heptafluoroiodine |
| Molecular formula | IF7 |
| Molar mass | 259.89 g mol−1 |
| Density | 2.7 g cm−3 (solid) |
| Solubility (water) | ? g L−1 |
| Melting point | 6.5°C (triple point) |
| Boiling point | 4.8°C (sublimes at 1 atm) |
| CAS number | [16921-96-3] |
| Disclaimer and references | |
Iodine heptafluoride, also known as iodine(VII) fluoride or even iodine fluoride, is the compound IF7. It has an unusual pentagonal bipyramidal structure, as predicted by VSEPR theory.[1] The molecule can undergo a pseudorotational rearangment like the Berry mechanism but for a hepta coordinated system. [2] It forms colorless 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 moldy, acrid odor.
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[edit] Preparation
IF7 is prepared by passing F2 through liquid IF5 at 90 °C, then heating the vapors to 270 °C. Alternately, this compound can be prepared from fluorine and dried PdI2 or KI to minimize the formation of IOF5, an impurity arising by hydrolysis.[3] [4]
[edit] Safety considerations
IF7 is highly irritating to both the skin and the mucous membranes.
[edit] References
- Macintyre, J. E. (Ed.). (1992). Dictionary of Inorganic Compounds (Vol. 3). London: Chapman & Hall.
- O'Neil, Maryadele J. (Ed.). (2001). The Merck Index (13th ed.). Whitehouse Station, NJ: Merck.
- ^ 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.
- ^ 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.
- ^ W. C. Schumb, M. A. Lynch, Jr. (1950). "Iodine Heptafluoride". Industrial & Engineering Chemistry 42 (7): 1383 - 1386. DOI:10.1021/ie50487a035.
- ^ Ruff O., Keim R. (1930). ""Das Jod-7-fluorid" (The iodine-7-fluoride)". Zeitschrift für Anorganische un Allgemeine Chemie 193 (1/2): 176-186. DOI:10.1002/zaac.19301930117.
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