Curium(III) fluoride

Curium(III) fluoride
Crystal structure
Names
IUPAC name
Curium(III) fluoride
Other names
Curium trifluoride
Identifiers
3D model (JSmol)
ChemSpider
  • InChI=1S/Cm.3FH/h;3*1H/q+3;;;/p-3 checkY
  • F[Cm](F)F
Properties
CmF3
Appearance Colorless solid
Melting point 1406 ± 20 °C;
~10 mg/L
Structure
Rhombohedral, hR24
P3c1, No. 165
a = 0.7012 nm, c = 0.7198 nm
0.30650
6
Thermochemistry
121 J/mol·K
−1660 kJ/mol
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Curium(III) fluoride or curium trifluoride is the chemical compound composed of curium and fluorine with the formula CmF3. 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.

Preparation

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

Cm3+ (aq) + 3 F− (aq) → CmF3 (s) ↓

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

References

  1. 1 2 3 4 5 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.