Promethium(III) fluoride

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| ImageFile = Kristallstruktur Lanthanfluorid.png

| ImageFile2 =

| ImageCaption = Crystal structure

| IUPACName = Promethium(III) fluoride

| OtherNames = Promethium trifluoride

| Section1 = {{Chembox Identifiers

| CASNo = 13709-45-0

| ChemSpiderID = 103871343

| PubChem = 129681501

| SMILES = [F-].[F-].[F-].[Pm+3]

| StdInChI=1S/3FH.Pm/h3*1H;/q;;;+3/p-3

| StdInChIKey=GBTXURQYFJSURZ-UHFFFAOYSA-K

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|Section2={{Chembox Properties

| Formula = PmF₃

| MolarMass = 202 g/mol

| Appearance = pink solid

| Density =

| Solubility =

| MeltingPt = 1338 °C

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| MeltingPt_ref = {{RubberBible92nd|page=4.84}}

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|Section3={{Chembox Structure

| CrystalStruct = Rhombohedral, hR24

| SpaceGroup = P{{overline|3}}c1, No. 165{{cite journal|doi=10.1107/S0365110X49001016|title=Crystal chemical studies of the 5f-series of elements. XII. New compounds representing known structure types|journal=Acta Crystallographica|volume=2|issue=6|pages=388–390|year=1949|last1=Zachariasen|first1=W. H.|doi-access=free|bibcode=1949AcCry...2..388Z }}

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Promethium(III) fluoride or promethium trifluoride is a salt of promethium and fluorine with the formula PmF₃.

Promethium(III) fluoride is sparingly soluble in water. It reacts with metallic lithium to yield lithium fluoride and metallic promethium:{{cite journal|doi=10.1002/ange.19630751009|title=Darstellung von metallischem Promethium|journal=Angewandte Chemie|volume=75|issue=10|pages=451|year=1963|last1=Weigel|first1=F.|bibcode=1963AngCh..75..451W }}

:{{chem2|PmF3 + 3Li → Pm + 3LiF}}