Rhodium hexafluoride

Rhodium hexafluoride, also rhodium(VI) fluoride, (RhF6) is the inorganic compound of rhodium and fluorine. A black volatile solid,[1] it is a highly reactive material, and a rare example of a rhodium(VI) compound. It is one of seventeen known binary hexafluoride.

Rhodium hexafluoride
Names
IUPAC name
rhodium(VI) fluoride
Other names
rhodium hexafluoride
Identifiers
CAS Number
3D model (JSmol)
CompTox Dashboard (EPA)
Properties
Chemical formula
 F6Rh
Molar mass 216.91 g/mol
Appearance black crystalline solid[1]
Density 3.71g/mL[2]
Melting point ≈ 70 °C (158 °F; 343 K)[1]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Synthesis, structure, properties

Rhodium hexafluoride is prepared by reaction of rhodium metal with an excess of elemental fluorine:[3]

Rh + 3 F2 → RhF6

The RhF6 molecule has octahedral molecular geometry. Consistent with its d3 configuration, the six Rh–F bond lengths are equivalent, being 1.824 Å.[2] It crystallises in an orthorhombic space group Pnma with lattice parameters of a = 9.323 Å, b = 8.474 Å, and c = 4.910 Å.

Like some other metal fluorides, RhF6 is highly oxidizing. It attacks even glass even in the absence of water.[3] It can even react with elemental oxygen.[4]

References
  1. CRC Handbook of Chemistry and Physics, 90th Edition, CRC Press, Boca Raton, Florida, 2009, ISBN 978-1-4200-9084-0, Section 4, Physical Constants of Inorganic Compounds, p. 4-85.
  2. Drews, T.; Supeł, J.; Hagenbach, A.; Seppelt, K. (2006). "Solid State Molecular Structures of Transition Metal Hexafluorides". Inorganic Chemistry. 45 (9): 3782–3788. doi:10.1021/ic052029f. PMID 16634614.
  3. 《无机化学丛书》第九卷：锰分族、铁系、铂系 (in Chinese). 北京: 科学出版社. p. 478. ISBN 7-03-002238-6.
  4. Riedel, Sebastian; Kaupp, Martin (2009). "The highest oxidation states of the transition metal elements" (PDF). Coordination Chemistry Reviews. Elsevier. 253: 606–624. doi:10.1016/j.ccr.2008.07.014.

Further reading
  • Gmelins Handbuch der anorganischen Chemie, System Nr. 63, Rhodium, Part B1, pp. 266–268.
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