Actinium(III) fluoride
From Wikipedia the free encyclopedia
 Crystal structure | |
| Names | |
|---|---|
| Other names Actinium(III) fluoride Actinium trifluoride | |
| Identifiers | |
3D model (JSmol) | |
PubChem CID | |
| |
| |
| Properties | |
| AcF3 | |
| Molar mass | 284 g/mol[1] |
| Appearance | white, crystalline solid |
| Density | 7.88 g/cm3[1] |
| Structure | |
| Rhombohedral, hR24 | |
| P3c1, No. 165[2] | |
a = 0.741 nm, c = 0.755 nm | |
Lattice volume (V) | 0.35902 |
Formula units (Z) | 6 |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
Actinium(III) fluoride (AcF3) is an inorganic compound, a salt of actinium and fluorine.
Synthesis
[edit]Actinium fluoride can be prepared in solution or by a solid-state reaction. In the first method, actinium hydroxide is treated with hydrofluoric acid and the product precipitates:[3]
- Ac(OH)3 + 3HF → AcF3↓ + 3H2O
In the solid-state reaction, actinium metal is treated with hydrogen fluoride gas at 700 °C in a platinum crucible.[4][5]
Properties
[edit]Actinium fluoride is a white solid that reacts with ammonia at 900–1000 °C to yield an actinium oxyfluoride:
- AcF3 + 2NH3 + H2O → AcOF + 2NH4F
While lanthanum oxyfluoride is easily formed by heating lanthanum fluoride in air, a similar treatment merely melts actinium fluoride and does not yield AcOF.[4][5]
References
[edit]- ^ a b Haynes, William M., ed. (2011). CRC Handbook of Chemistry and Physics (92nd ed.). Boca Raton, FL: CRC Press. p. 4.44. ISBN 1-4398-5511-0.
- ^ 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. Bibcode:1949AcCry...2..388Z. doi:10.1107/S0365110X49001016.
- ^ Haire, Richard G. (2006). "Actinium". 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. 36. ISBN 1-4020-3555-1.
- ^ a b Fried, Sherman; Hagemann, French; Zachariasen, W. H. (1950). "The Preparation and Identification of Some Pure Actinium Compounds". Journal of the American Chemical Society. 72 (2): 771. doi:10.1021/ja01158a034.
- ^ a b Meyer, Gerd and Morss, Lester R. (1991) Synthesis of lanthanide and actinide compounds. Springer. ISBN 0-7923-1018-7. pp. 87–88