Iodine heptafluoride
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| Iodine heptafluoride | |
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| Other names | iodine fluoride heptafluoroiodine |
| Identifiers | |
| CAS number | [16921-96-3] |
| Properties | |
| Molecular formula | IF7 |
| Molar mass | 259.89 g mol−1 |
| Density | 2.7 g cm−3 (solid) |
| Melting point |
4.5°C (triple point) |
| Boiling point |
4.8°C (sublimes at 1 atm) |
| Solubility in other solvents | ? g L−1 |
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox disclaimer and references |
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Iodine heptafluoride, also known as iodine(VII) fluoride or even iodine fluoride, is the compound IF7[1][2]. It has an unusual pentagonal bipyramidal structure, as predicted by VSEPR theory.[3] The molecule can undergo a pseudorotational rearangment like the Berry mechanism but for a hepta coordinated system.[4] 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.
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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.[5] [6]
[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:.
- ^ 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:.
- ^ W. C. Schumb, M. A. Lynch, Jr. (1950). "Iodine Heptafluoride". Industrial & Engineering Chemistry 42 (7): 1383–1386. doi:.
- ^ 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:.
[edit] External links
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