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
3D model (JSmol)
Properties
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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