:Chromium pentafluoride

{{redirect|CrF5|the airport|Saskatoon/Richter Field Aerodrome}}

{{Chembox

| ImageFile = CrF5cain.tif

| ImageSize = 232px

| Name = Chromium pentafluoride

| OtherNames = Chromium fluoride, Chromium(V) fluoride, Pentafluorochromium, Pentafluoridochromium

| IUPACName = Chromium(V) fluoride

|Section1={{Chembox Identifiers

| CASNo = 14884-42-5

| PubChem = 5460742

| ChemSpiderID = 4574207

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

| InChI =1S/Cr.5FH/h;5*1H/q+5;;;;;/p-5

| InChIKey = OMKYWARVLGERCK-UHFFFAOYSA-I

}}

|Section2={{Chembox Properties

| Properties_ref = {{cite book |last=Perry|first=Dale L.|date=2011|title=Handbook of Inorganic Compounds, Second Edition|page=125|url=https://books.google.com/books?id=SFD30BvPBhoC|location=Boca Raton, Florida|publisher=CRC Press|isbn=978-1-43981462-8|access-date=2014-01-10}}

| Cr=1 | F=5

| Formula = CrF₅

| MolarMass = 146.988 g/mol

| Appearance = red crystals

| Density = 2.89 g/cm³

| MeltingPtC = 34

| BoilingPtC = 117

| Solubility =

| SolubleOther = }}

|Section3={{Chembox Structure

| Structure_ref =

| CrystalStruct = orthorhombic

| SpaceGroup = Pbcm, No. 57

| LattConst_a = 782.9 pm

| LattConst_b = 753.4 pm

| LattConst_c = 551.8 pm

| UnitCellFormulas = 4

| Coordination = octahedral

}}

}}

Chromium pentafluoride is the inorganic compound with the chemical formula CrF₅.{{cite book | title = Chromium(VI) Handbook | year = 2004 | publisher = CRC Press | isbn = 9780203487969 |editor1=Jacques Guertin |editor2=James A. Jacobs |editor3=Cynthia P. Avakian | page = 30}} It is a red volatile solid that melts at 34 °C. It is the highest known chromium fluoride, since the hypothetical chromium hexafluoride has not yet been synthesized.{{cite journal |last1=Riedel |first1=Sebastian |last2=Kaupp |first2=Martin |year=2009 |title=The highest oxidation states of the transition metal elements |journal=Coordination Chemistry Reviews |volume=253 |issue=5–6 |doi=10.1016/j.ccr.2008.07.014 |pages=606–624 }}

Chromium pentafluoride is one of the products of the action of fluorine on a mixture of potassium and chromic chlorides.{{cite book | title=Fluorine Chemistry | author = A. G. Sharpe | editor = J.H. Simons | publisher = Elsevier |date=2012 | page = 24 | isbn = 9780323145435 | volume=2 }}

In terms of its structure, the compound is a one-dimensional coordination polymer. Each Cr(V) center has octahedral molecular geometry.{{cite journal|title=The structures of CrF₅ and CrF₅*SbF₅|author1=Shorafa, H.|author2=Seppelt, K.|journal=Zeitschrift für anorganische und allgemeine Chemie|year=2009| volume=635|issue=1|pages=112–114|doi=10.1002/zaac.200800378}} It has the same crystal structure as vanadium pentafluoride.{{cite book | title = Advances in Inorganic Chemistry | volume = 27 | author = A. G. Sharpe | publisher = Academic Press | year = 1983 | isbn = 9780080578767 | page = 103}}

Chromium pentafluoride is strongly oxidizing, able to fluorinate the noble gas xenon and oxidize dioxygen to dioxygenyl. Due to this property, it decomposes readily in the presence of reducing agents, and easily hydrolyses to chromium(III) and chromium(VI).{{cite book | title = Text Book Of Inorganic Chemistry | author = Amit Aora | page = 649 | publisher = Discovery Publishing House | year = 2005}}