Neptunium(III) fluoride

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| ImageFile =

| ImageFile2 =

| ImageCaption =

| IUPACName = Neptunium(III) fluoride

| OtherNames = Neptunium trifluoride

| Section1 = {{Chembox Identifiers

| CASNo = 16852-37-2

| ChemSpiderID = 103872710

| PubChem = 13751216

| PubChem_Comment=

| SMILES = F[Np](F)F

| StdInChI_Ref = {{stdinchicite|correct|chemspider}}

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

| StdInChIKey =ZBOLUSKWQLLYDC-UHFFFAOYSA-K

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|Section2={{Chembox Properties

| Formula = NpF₃

| MolarMass = 294 g/mol

| Appearance = Purple solid

| Density =

| Solubility =

| MeltingPt =

| MeltingPt_notes =

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|Section3={{Chembox Structure

| CrystalStruct = Trigonal, hP8

| SpaceGroup = P6₃/mmc, No. 194{{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}}

| LattConst_a = 0.7129 nm

| LattConst_c = 0.7288 nm

| UnitCellFormulas = 6

| UnitCellVolume =0.32077 nm³

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|Section5={{Chembox Thermochemistry

| DeltaHf = −1529 ± 8 kJ/mol

{{cite book

| title = The Chemistry of the Actinide and Transactinide Elements |doi=10.1007/1-4020-3598-5_9

| editor1-last = Morss|editor2-first = Norman M.

| editor2-last = Edelstein

| editor3-last = Fuger|editor3-first = Jean

| last = Haire|first = Richard G.

| publisher = Springer Science+Business Media

| year = 2006

| isbn = 1-4020-3555-1

| location = Dordrecht, The Netherlands

| edition = 3rd

|pages= 730–736|chapter=Neptunium }}

| Entropy = 131 ± 3 J/mol·K

| DeltaGf = −1461 ± 8 kJ/mol

| HeatCapacity = 94 ± 3 J/mol·K

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| Section8 = {{Chembox Related

| OtherAnions = Neptunium(III) chloride

| OtherCations =

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Neptunium(III) fluoride or neptunium trifluoride is a salt of neptunium and fluorine with the formula NpF₃.