Neptunium(III) fluoride

Neptunium(III) fluoride
Names
IUPAC name Neptunium(III) fluoride
Other names Neptunium trifluoride
Identifiers
CAS Number	16852-37-2
3D model (JSmol)	Interactive image
PubChem CID	101946364 wrong charge
InChI InChI=1S/Np.3FH/h;3*1H/q+3;;;/p-3^Y Key: ZBOLUSKWQLLYDC-UHFFFAOYSA-K
SMILES F[Np](F)F
Properties
Chemical formula	NpF₃
Molar mass	294 g/mol
Appearance	Purple solid^[1]
Structure
Crystal structure	Trigonal, hP8^[1]
Space group	P6₃/mmc, No. 194^[2]
Lattice constant	a = 0.7129 nm, c = 0.7288 nm
Lattice volume (V)	0.32077 nm³
Formula units (Z)	6
Thermochemistry
Heat capacity (C)	94 ± 3 J/mol·K^[1]
Std molar entropy (S^⦵₂₉₈)	131 ± 3 J/mol·K^[1]
Std enthalpy of formation (Δ_fH^⦵₂₉₈)	−1529 ± 8 kJ/mol^[1]
Gibbs free energy (Δ_fG^⦵)	-1461 ± 8 kJ/mol^[1]
Related compounds
Other anions	Neptunium(III) chloride
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

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

Synthesis

Neptunium(III) fluoride can be prepared by reacting neptunium dioxide with a gas mixture of hydrogen and hydrogen fluoride at 500 °C:^[1]

\mathrm {2\ NpO_{2}\ +\ H_{2}\ +\ 6\ HF\ \longrightarrow \ 2\ NpF_{3}\ +\ 4\ H_{2}O}

References

^ ^a ^b ^c ^d ^e ^f ^g 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.

Neptunium compounds

Np(III)

Np(IV)

Organoneptunium(IV) compounds	Np(C₂O₄)₂ Np(C₈H₈)₂

Np(V)

NpF₅

Np(VI)

NpF₆

Np(VII)

NpO₂(OH)₃

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