Rhodium pentafluoride

Rhodium pentafluoride
Names
IUPAC name
Rhodium(V) fluoride
Identifiers
3D model (JSmol)
  • InChI=1S/5FH.Rh/h5*1H;/q;;;;;+5/p-5
    Key: AUMCJABXDMCEGV-UHFFFAOYSA-I
  • monomer: F[Rh](F)(F)(F)F
  • tetramer: F[Rh-]1(F)(F)(F)[F+][Rh-](F)(F)(F)(F)[F+][Rh-](F)(F)(F)(F)[F+][Rh-](F)(F)(F)(F)[F+]1
Properties
F5Rh
Molar mass 197.89751 g·mol−1
Appearance Red solid
Density 3.95 g cm3
Structure
Monoclinic
P21/a
a = 12.338, b = 9.9173, c = 5.5173
α = 90°, β = 100.42°°, γ = 90°
663.85
8
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Rhodium pentafluoride is an inorganic compound with the formula Rh4F20. It is a red solid. It is prepared by fluorination of rhodium trifluoride at 400 °C.[1]

According to X-ray crystallography, the Rh centers are octahedral. The structure is very similar to that of the related ruthenium pentafluoride, osmium pentafluoride, and iridium pentafluoride. All are tetrameric, meaning that they have the molecular structure [MF5]4. The M-F distances for the bridging fluoride ligands are typically about 0.2 Å longer than the Rh-F distances for the nonbridging fluoride ligands. In the case of rhodium pentafluoride, these distances average 1.999(4) and 1.808(8) Å.[2] The Rh-F-Rh angles average 135°, which leads to a ruffled structure. In contrast, the M-F-M centers are linear in the pentafluorides of niobium, tantalum, molybdenum, and tungsten.

References

  1. ^ Holloway, J. H.; Rao, P. R.; Bartlett, Neil (1965). "Quinquevalent rhodium compounds: RhF5 and CsRhF6". Chemical Communications (14): 306–7. doi:10.1039/c19650000306.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  2. ^ Morrell, B. K.; Zalkin, A.; Tressaud, A.; Bartlett, N. (1973). "Crystal Structure of Rhodium Pentafluoride". Inorganic Chemistry. 12 (11): 2640–p2644. doi:10.1021/ic50129a029.{{cite journal}}: CS1 maint: multiple names: authors list (link)

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