Rhodium pentafluoride

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| ImageFile1 = PtF5solid.tif

| ImageFile2 = Unit_cell__of_OsF5.png

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| IUPACName = Rhodium(V) fluoride

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| Section1 = {{Chembox Identifiers

| CASNo = 41517-05-9

| PubChem = 129730862

| StdInChI=1S/5FH.Rh/h5*1H;/q;;;;;+5/p-5

| StdInChIKey = AUMCJABXDMCEGV-UHFFFAOYSA-I

| SMILES = F[Rh](F)(F)(F)F

| SMILES_Comment = monomer

| SMILES1 = 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

| SMILES1_Comment = tetramer

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| Section2 = {{Chembox Properties

| Rh=1|F=5

| MolarMass =

| Appearance = Red solid

| Density = 3.95 g cm³

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| Section3 = {{Chembox Structure

| Structure_ref =

| CrystalStruct = Monoclinic

| SpaceGroup = P2₁/a

| PointGroup =

| LattConst_a = 12.338

| LattConst_b = 9.9173

| LattConst_c = 5.5173

| LattConst_beta = 100.42°

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| UnitCellVolume = 663.85

| UnitCellFormulas = 8

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| Section7 = {{Chembox Hazards

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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.{{cite journal|title=Quinquevalent rhodium compounds: RhF₅ and CsRhF₆|author=Holloway, J. H.; Rao, P. R.; Bartlett, Neil|journal=Chemical Communications|year=1965|issue=14 |pages=306–7|doi=10.1039/c19650000306}}

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.{{cite journal|author=Morrell, B. K.; Zalkin, A.; Tressaud, A.; Bartlett, N.|title=Crystal Structure of Rhodium Pentafluoride|journal=Inorganic Chemistry|year=1973|volume=12|issue=11|page=2640–p2644|doi=10.1021/ic50129a029|url=http://www.escholarship.org/uc/item/8rr7v0p0}} 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.