Rhenium heptafluoride
From Infogalactic: the planetary knowledge core
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| Names | |
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| IUPAC name
rhenium heptafluoride, heptafluoridorhenium
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| Identifiers | |
17029-21-9  |
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| ChemSpider | 26323924 |
| Jmol 3D model | Interactive image |
| PubChem | 123369 |
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| Properties | |
| ReF7 | |
| Molar mass | 319.196 g/mol |
| Appearance | Bright yellow crystalline solid |
| Density | 4.3g/cm3 |
| Melting point | 48.3 °C (118.9 °F; 321.4 K) |
| Boiling point | 73.72 °C (164.70 °F; 346.87 K) |
| Structure | |
| triclinic, aP16 | |
| P-1, No. 2 | |
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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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
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