Rhenium heptafluoride

Source: Wikipedia, the free encyclopedia.
Rhenium heptafluoride
Names
IUPAC name
rhenium heptafluoride, heptafluoridorhenium
Identifiers
3D model (
JSmol
)
ChemSpider
UNII
  • InChI=1S/7FH.Re/h7*1H;/q;;;;;;;+7/p-7 ☒N
    Key: HFHBKXWKPQUYIA-UHFFFAOYSA-G ☒N
  • InChI=1/7FH.Re/h7*1H;/q;;;;;;;+7/p-7/rF7Re/c1-8(2,3,4,5,6)7
    Key: HFHBKXWKPQUYIA-KLJGHBABAK
  • F[Re](F)(F)(F)(F)(F)F
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)
 7.53 kJ/mol[1]
30.77 kJ/mol[1]
Related compounds
Related compounds
 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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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]

Production, reactions and properties

Rhenium heptafluoride can be prepared from the elements at 400 °C:[5]

2 Re + 7 F2 → 2 ReF7

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]

ReF7 + 4H2O → HReO4 + 7HF

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]

References

  1. ^
    doi:10.1016/0022-1902(61)80267-4
    .
  2. ISBN 978-0-08-037941-8
    .
  3. S2CID 20013073
    .
  4. hdl:2027.42/70852
    .
  5. ^
    ISBN 0-12-352651-5
    .
  6. doi:10.1016/0022-1902(69)80569-5
    .
  7. doi:10.1016/S0022-1139(99)00248-1
    .
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