:Protactinium(V) chloride

{{chembox

| ImageFile = PaCl5.svg

| ImageSize = 300px

| IUPACName = Protactinium(V) chloride

| OtherNames = Protactinium pentachloride, Protactinium chloride

|Section1={{Chembox Identifiers

| Abbreviations =

| CASNo = 13760-41-3

| EINECS =

| PubChem = 11047828

| ChemSpiderID = 9222996

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

| StdInChIKey = QRPCDPJECLHYKR-UHFFFAOYSA-I

| SMILES = Cl[Pa](Cl)(Cl)(Cl)Cl

}}

|Section2={{Chembox Properties

| Formula = PaCl₅

| MolarMass = 408.301 g/mol

| Appearance = yellow monoclinic crystals

| Density = 3.74 g/cm³

| MeltingPtC = 306

| MeltingPt_ref =

{{Cite book

| last = Lide

| first = David R.

| year = 1998

| title = Handbook of Chemistry and Physics

| edition = 87

| location = Boca Raton, FL

| publisher = CRC Press

| isbn = 0849305942

| pages = 484

| url = https://books.google.com/books?id=lFjg0L-uOxoC&q=%22Protactinium(V)+chloride%22&pg=PT869

| access-date = 2008-07-17

}}

| BoilingPtC = 420

| BoilingPt_ref = {{cite web |url= http://202.114.88.54/g/web18/wangluo/webelements/webelements/compounds/text/pa/cl5pa1-13760413.html |title= Chemistry: WebElements Periodic Table: Professional Edition: Protactinium: compound data (protactinium (V) chloride) |access-date= 2008-07-17 |publisher= WebElements }}{{Dead link|date=May 2020 |bot=InternetArchiveBot |fix-attempted=yes }}

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|Section3={{Chembox Structure

| CrystalStruct = monoclinic, mS24

| SpaceGroup = c12/c1, #15

| Coordination = Pa, 7, pentagonal bipyramidal
Cl, 1 and 2

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| Dipole =

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|Section4={{Chembox Thermochemistry

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|Section7={{Chembox Hazards

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|Section8={{Chembox Related

| OtherAnions = Protactinium(V) fluoride
Protactinium(V) bromide
Protactinium(V) iodide

| OtherCations = Praseodymium(III) chloride
Uranium(IV) chloride
Thorium(IV) chloride

| OtherCompounds = Protactinium(IV) chloride

}}

}}

Protactinium(V) chloride is the chemical compound composed of protactinium and chlorine with the formula PaCl₅. It forms yellow monoclinic crystals and has a unique structure composed of chains of 7 coordinate, pentagonal bipyramidal, protactinium atoms sharing edges.R. P. Dodge, G. S. Smith, Q. Johnson, R. E. Elson: „The Crystal Structure of Protactinium Pentachloride“, Acta Crystallogr., 1967, 22, 85–89; {{doi|10.1107/S0365110X67000155}}.

Protactinium(V) chloride can react with boron tribromide at high temperatures to form protactinium(V) bromide.Georg Brauer (Hrsg.), unter Mitarbeit von Marianne Baudler u. a.: Handbuch der Präparativen Anorganischen Chemie. 3., umgearbeitete Auflage. Band I, Ferdinand Enke, Stuttgart 1975, ISBN 3-432-02328-6, S. 1177. It also reacts with fluorine to form protactinium(V) fluoride at high temperatures.