Curium(III) fluoride

Curium(III) fluoride
	; Crystal structure
Names
	IUPAC name Curium(III) fluoride
	Other names Curium trifluoride
Identifiers
CAS Number	13708-79-7;
3D model (JSmol)	Interactive image;
ChemSpider	57569004 ;
PubChem CID	101943145;
	InChI InChI=1S/Cm.3FH/h;3*1H/q+3;;;/p-3 ;
	SMILES F[Cm](F)F;
Properties
Chemical formula	CmF3
Appearance	Colorless solid
Melting point	1406 ± 20 °C;
Solubility in water	~10 mg/L
Structure
Crystal structure	Rhombohedral, hR24
Space group	P3c1, No. 165
Lattice constant	a = 0.7012 nm, c = 0.7198 nm
Lattice volume (V)	0.30650
Formula units (Z)	6
Thermochemistry
Std molar; entropy (S⦵298)	121 J/mol·K
Std enthalpy of; formation (ΔfH⦵298)	−1660 kJ/mol
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Curium(III) fluoride or curium trifluoride is the chemical compound composed of curium and fluorine with the formula CmF₃.^[3] It is a white, nearly insoluble salt that has the same crystal structure as LaF₃. It precipitates as a hydrate when fluoride ions are added to a weakly acidic Cm(III) solution; alternatively it can be synthesized by reacting hydrofluoric acid with Cm(OH)₃. The anhydrous form is then obtained by desiccation or by treatment with hydrogen fluoride gas.^[1]

Preparation

Curium fluoride can be prepared by in the reaction of curium with fluorine ions in an aqueous solution under weakly acidic conditions:

{\ce {Cm^3+ (aq) + 3 F^- (aq) -> CmF3 (s) v}}

Another possible preparation is the reaction of curium hydroxide with hydrofluoric acid, which also produces a hydrate of Curium fluoride.^[4]

References

^ ^a ^b ^c ^d ^e Haire, Richard G. (2006). "Curium (9.7.3 Halides)". 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. p. 1417. doi:10.1007/1-4020-3598-5_9. ISBN 1-4020-3555-1.
^ Nave, S. E.; Haire, R. G.; Huray, Paul G. (1983). "Magnetic properties of actinide elements having the 5f⁶ and 5f⁷ electronic configurations". Physical Review B. 28 (5): 2317. doi:10.1103/PhysRevB.28.2317.
^ Macintyre, Jane E. (23 July 1992). Dictionary of Inorganic Compounds. CRC Press. p. 3046. ISBN 978-0-412-30120-9. Retrieved 27 June 2023.
^ Lumetta, Gregg J.; Thompson, Major C.; Penneman, Robert A.; Eller, P. Gary (2006). Morss, Lester R.; Edelstein, Norman M.; Fuger, Jean (eds.). Curium. Dordrecht: Springer Netherlands. pp. 1397–1443. doi:10.1007/1-4020-3598-5_9. ISBN 978-1-4020-3598-2.

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[r2-1] Haire, Richard G. (2006). "Curium (9.7.3 Halides)". 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. p. 1417. doi:10.1007/1-4020-3598-5_9. ISBN 1-4020-3555-1.

[2] Nave, S. E.; Haire, R. G.; Huray, Paul G. (1983). "Magnetic properties of actinide elements having the 5f⁶ and 5f⁷ electronic configurations". Physical Review B. 28 (5): 2317. doi:10.1103/PhysRevB.28.2317.

[3] Macintyre, Jane E. (23 July 1992). Dictionary of Inorganic Compounds. CRC Press. p. 3046. ISBN 978-0-412-30120-9. Retrieved 27 June 2023.

[4] Lumetta, Gregg J.; Thompson, Major C.; Penneman, Robert A.; Eller, P. Gary (2006). Morss, Lester R.; Edelstein, Norman M.; Fuger, Jean (eds.). Curium. Dordrecht: Springer Netherlands. pp. 1397–1443. doi:10.1007/1-4020-3598-5_9. ISBN 978-1-4020-3598-2.

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