Neptunium(IV) fluoride

Neptunium(IV) fluoride
Names
	IUPAC name Neptunium(IV) fluoride
	Other names Neptunium tetrafluoride
Identifiers
CAS Number	14529-88-5;
3D model (JSmol)	Interactive image;
PubChem CID	101946363 wrong charge;
	InChI InChI=1S/4FH.Np/h4*1H;/q;;;;+4/p-4 Key: SOLQLNAXKAQIPH-UHFFFAOYSA-J;
	SMILES F[Np](F)(F)F;
Properties
Chemical formula	NpF4
Molar mass	313 g/mol
Appearance	Green solid[1]
Structure
Crystal structure	Monoclinic, mS60[1]
Space group	C2/c, No. 15[2]
Lattice constant	a = 1.27 nm, b = 1.0082 nm, c = 0.833 nm α = 90°, β = 126.03°, γ = 90°
Lattice volume (V)	0.86256 nm3
Formula units (Z)	12
Thermochemistry
Heat capacity (C)	116 ± 4 J/mol·K[1]
Std molar; entropy (S⦵298)	148 ± 3 J/mol·K[1]
Std enthalpy of; formation (ΔfH⦵298)	−1874 ± 16 kJ/mol[1]
Gibbs free energy (ΔfG⦵)	-1783 ± 16 kJ/mol[1]
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Neptunium(IV) fluoride or neptunium tetrafluoride is a inorganic compound with the formula NpF₄. It is a green salt and is isostructural with UF₄.[3]

Synthesis

Alternative view of the structure of solid NpF₄.

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:[1]

\mathrm {4\ NpF_{3}\ +\ O_{2}\ +\ 4\ HF\ \longrightarrow \ 4\ NpF_{4}\ +\ 2\ H_{2}O}

It can also be prepared by treating neptunium dioxide with HF gas:[1]

\mathrm {NpO_{2}\ +\ 4\ HF\ \longrightarrow \ NpF_{4}\ +\ 2\ H_{2}O}

References

Haire, Richard G. (2006). "Neptunium". In Morss; Edelstein, Norman M.; Fuger, Jean (eds.). The Chemistry of the Actinide and Transactinide Elements (3rd ed.). Dordrecht, The Netherlands: Springer Science+Business Media. pp. 730–736. doi:10.1007/1-4020-3598-5_9. ISBN 1-4020-3555-1.
Zachariasen, W. H. (1949). "Crystal chemical studies of the 5f-series of elements. XII. New compounds representing known structure types". Acta Crystallographica. 2 (6): 388–390. doi:10.1107/S0365110X49001016.
Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 978-0-08-037941-8.

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[r1-1] Haire, Richard G. (2006). "Neptunium". In Morss; Edelstein, Norman M.; Fuger, Jean (eds.). The Chemistry of the Actinide and Transactinide Elements (3rd ed.). Dordrecht, The Netherlands: Springer Science+Business Media. pp. 730–736. doi:10.1007/1-4020-3598-5_9. ISBN 1-4020-3555-1.

[2] Zachariasen, W. H. (1949). "Crystal chemical studies of the 5f-series of elements. XII. New compounds representing known structure types". Acta Crystallographica. 2 (6): 388–390. doi:10.1107/S0365110X49001016.

[3] Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 978-0-08-037941-8.