Curium(III) fluoride
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Crystal structure
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| Names | |
|---|---|
| IUPAC name
Curium(III) fluoride
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| Other names
Curium trifluoride
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| Identifiers | |
3D model (JSmol)
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| ChemSpider |
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PubChem CID
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|
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| Properties | |
| CmF3 | |
| Appearance | Colorless solid[1] |
| Melting point | 1406 ± 20 °C;[1] |
| ~10 mg/L | |
| Structure | |
| Rhombohedral, hR24 | |
| P3c1, No. 165[2] | |
a = 0.7012 nm, c = 0.7198 nm
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Lattice volume (V)
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0.30650 |
Formula units (Z)
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6 |
| Thermochemistry | |
Std molar
entropy (S⦵298) |
121 J/mol·K[1] |
Std enthalpy of
formation (ΔfH⦵298) |
−1660 kJ/mol[1] |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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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
[edit ]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.[4]
References
[edit ]- ^ 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.
