Rhenium heptafluoride is the compound with the formula ReF7. It is a yellow low melting solid and is the only thermally stable metal heptafluoride.[2] It has a distorted pentagonal bipyramidal structure similar to IF7, which was confirmed by neutron diffraction at 1.5 K.[3] The structure is non-rigid, as evidenced by electron diffraction studies.[4]
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IUPAC name
rhenium heptafluoride, heptafluoridorhenium
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Identifiers | |
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3D model (JSmol)
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PubChem CID
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UNII |
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CompTox Dashboard (EPA)
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Properties | |
ReF7 | |
Molar mass | 319.196 g/mol |
Appearance | Bright yellow crystalline solid |
Density | 4.3 g/cm3 |
Melting point | 48.3 °C (118.9 °F; 321.4 K) |
Boiling point | 73.72 °C (164.70 °F; 346.87 K) |
Reacts | |
Vapor pressure | 13.41 kPa[1] |
Structure | |
triclinic, aP16 | |
P1 (No. 2) | |
Thermochemistry | |
Enthalpy of fusion (ΔfH⦵fus)
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7.53 kJ/mol[1] |
Enthalpy of vaporization (ΔfHvap)
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30.77 kJ/mol[1] |
Related compounds | |
Related compounds
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Osmium heptafluoride |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references
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Rhenium heptafluoride can be prepared from the elements at 400 °C:[5]
It also can be produced by the explosion of rhenium metal under sulfur hexafluoride. [6]
It hydrolyzes under a base to form perrhenic acid and hydrogen fluoride:[1]
With fluoride donors such as CsF, the ReF−
8 anion is formed, which has a square antiprismatic structure.[7] With antimony pentafluoride, SbF5, a fluoride acceptor, the ReF+
6 cation is formed.[5]