Rhenium heptafluoride
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| Rhenium heptafluoride | ||
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| IUPAC name rhenium heptafluoride, heptafluoridorhenium | ||
| Identifiers | ||
| CAS number | 17029-21-9 | |
| PubChem | 123369 | |
| Jmol-3D images | {{#if:F[Re](F)(F)(F)(F)(F)F|Image 1 | |
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| Properties | ||
| Molecular formula | ReF7 | |
| Molar mass | 319.196 g/mol | |
| Appearance | Bright yellow crystalline solid | |
| Density | 4.3g/cm3 | |
| Melting point | 48.3°C | |
| Boiling point | 73.72°C | |
| Structure | ||
| Crystal structure | triclinic, aP16 | |
| Space group | P-1, No. 2 | |
 (verify) (what is: / ?)Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa) | ||
| Infobox references | ||
Rhenium heptafluoride is the compound with the formula ReF7. It is a yellow low melting solid, and is the only thermally stable metal heptafluoride.[1] It has a distorted pentagonal bipyramidal structure similar to IF7, which was confirmed by neutron diffraction at 1.5K.[2] The structure is non-rigid as evidenced by electron diffraction studies.[3]
It can be prepared from the elements at 400°C:[4]
- 2Re + 7 F2 → 2 ReF7
With fluoride donors such as CsF, the ReF8− anion is formed, which has a square antiprismatic structure.[5] With antimony pentafluoride, SbF5, a fluoride acceptor, the ReF6+ cation is formed.[4]
References
- ↑ Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 0080379419.
- ↑ Vogt T., Fitch A. N., Cockcroft J. K. (1994). "Crystal and Molecular Structures of Rhenium Heptafluoride". Science 263 (5151): 1265. doi:10.1126/science.263.5151.1265. PMID 17817431.
- ↑ Jacob, E. Jean; Bartell, L.S.J. (1970). "Electron Diffraction Study of Rhenium Fluorides. II. Structure, Pseudorotation, and Anharmonic Coupling of Modes in ReF7". The Journal of Chemical Physics 53 (6): 2235. doi:10.1063/1.1674318.
- ↑ 4.0 4.1 A. F. Holleman; Wiberg, Egon; Wiberg, Nils (2001). Inorganic Chemistry. Boston: Academic Press. ISBN 0-12-352651-5.
- ↑ Hwang, I; Seppelt, K. (2000). "The structures of ReF8− and UF82−". Journal of Fluorine Chemistry 102: 69. doi:10.1016/S0022-1139(99)00248-1.
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