Actinium(III) fluoride
Chemical compound
From Wikipedia, the free encyclopedia
Actinium(III) fluoride (AcF3) is an inorganic compound, a salt of actinium and fluorine.
Crystal structure | |
| Names | |
|---|---|
| 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 | |
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).
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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]
- 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
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]