View source for Neptunium(IV) fluoride

{{Chembox
|ImageFile = ThCl4.png
|IUPACName = Neptunium(IV) fluoride
|OtherNames = Neptunium tetrafluoride
|Section1 = {{Chembox Identifiers
|CASNo = 14529-88-5
|PubChem = 101946363
|PubChem_Comment=wrong charge
|SMILES = F[Np](F)(F)F
|StdInChI = 1S/4FH.Np/h4*1H;/q;;;;+4/p-4
|StdInChIKey =SOLQLNAXKAQIPH-UHFFFAOYSA-J
}}
|Section2={{Chembox Properties
|Formula = NpF<sub>4</sub> 
|MolarMass = 313 g/mol
|Appearance = Green solid<ref name=r1/>
}}
|Section3={{Chembox Structure
|CrystalStruct = [[Monoclinic]], [[Pearson symbol|mS60]]<ref name=r1/>
|SpaceGroup = C2/c, No. 15<ref>{{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}}</ref>
|LattConst_a = 1.27 nm
|LattConst_b = 1.0082 nm
|LattConst_c = 0.833 nm
|LattConst_beta = 126.03
|UnitCellFormulas = 12
|UnitCellVolume =0.86256 nm<sup>3</sup>
}}
|Section4={{Chembox Thermochemistry
|DeltaHf = −1874 ± 16 kJ/mol<ref name=r1>
{{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 }}</ref>
|Entropy = 148 ± 3 J/mol·K<ref name=r1/>
|DeltaGf = -1783 ± 16 kJ/mol<ref name=r1/>
|HeatCapacity = 116 ± 4 J/mol·K<ref name=r1/>
}}
}}

'''Neptunium(IV) fluoride''' or '''neptunium tetrafluoride''' is a [[inorganic compound]] with the [[chemical formula|formula]] NpF<sub>4</sub>. It is a green salt and is isostructural with UF<sub>4</sub>.<ref>{{Greenwood&Earnshaw2nd}}</ref>

==Synthesis==
[[image:Kristallstruktur Uran(IV)-fluorid.png|thumb|left|162px|Alternative view of the structure of solid NpF<sub>4</sub>.]]
Neptunium(IV) fluoride can be prepared by reacting [[neptunium(III) fluoride]] or [[neptunium dioxide]] with a gas mixture of [[oxygen]] and [[hydrogen fluoride]] at 500 °C:<ref name=r1/>

:<math>\mathrm{4\ NpF_3\ +\ O_2\ +\ 4\ HF\ \longrightarrow \ 4\ NpF_4\ +\ 2\ H_2O}</math>

It can also be prepared by treating [[neptunium dioxide]] with HF gas:<ref name=r1/>
:<math>\mathrm{NpO_2\ +\ 4\ HF\ \longrightarrow \ NpF_4\ +\ 2\ H_2O}</math>

==References==
{{reflist}}
{{inorganic-compound-stub}}
{{Neptunium compounds}}
{{fluorine compounds}}
{{Actinide halides}}

[[Category:Neptunium compounds]]
[[Category:Fluorides]]
[[Category:Actinide halides]]