Chemistry:Actinium fluoride
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 Crystal structure
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| Names | |
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| Other names
Actinium(III) fluoride
Actinium trifluoride | |
| Identifiers | |
3D model (JSmol)
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PubChem CID
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| 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
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Lattice volume (V)
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0.35902 |
Formula units (Z)
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6 |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
 verify (what is   ?)
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| Infobox references | |
Actinium fluoride (AcF3) is an inorganic compound of actinium and fluorine.
Synthesis
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]
- [math]\ce{ Ac(OH)3 + 3HF -> AcF_3(v) + 3H2O }[/math]
In the solid-state reaction, actinium metal is treated with hydrogen fluoride gas at 700 °C in a platinum crucible.[4][5]
Properties
Actinium fluoride is a white solid that reacts with ammonia at 900–1000 °C to yield an actinium oxyfluoride:
- [math]\ce{ AcF3 + 2NH3 + H2O -> AcOF + 2NH4F }[/math]
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
- ↑ 1.0 1.1 Haynes, William M., ed (2011). CRC Handbook of Chemistry and Physics (92nd ed.). Boca Raton, FL: CRC Press. p. 4.44. ISBN 1439855110.
- ↑ 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.
- ↑ Haire, Richard G. (2006). "Actinium". in Morss; Edelstein, Norman M.; Fuger, Jean. The Chemistry of the Actinide and Transactinide Elements (3rd ed.). Dordrecht, The Netherlands: Springer Science+Business Media. p. 36. ISBN 1-4020-3555-1.
- ↑ 4.0 4.1 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.
- ↑ 5.0 5.1 Meyer, Gerd and Morss, Lester R. (1991) Synthesis of lanthanide and actinide compounds. Springer. ISBN:0-7923-1018-7. pp. 87–88
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