Actinium(III) fluoride

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Actinium fluoride
Names
Crystal structure
Other names Actinium(III) fluoride Actinium trifluoride
Identifiers
CAS Number	33689-80-4^Y
3D model (JSmol)	Interactive image
PubChem CID	101943120
InChI InChI=1S/Ac.3FH/h;31H/q+3;;;/p-3^Y InChI=1/Ac.3FH/h;31H/q+3;;;/p-3
SMILES F[Ac](F)F
Properties
Chemical formula	AcF₃
Molar mass	284 g/mol^[1]
Appearance	white, crystalline solid
Density	7.88 g/cm³^[1]
Structure
Crystal structure	Rhombohedral, hR24
Space group	P3c1, No. 165^[2]
Lattice constant	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). Y verify (what is ^YN ?) Infobox references

Actinium(III) fluoride (AcF₃) is an inorganic compound, a salt 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]

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]

References

^ ^a ^b Haynes, William M., ed. (2011). CRC Handbook of Chemistry and Physics (92nd ed.). Boca Raton, Florida: 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

v t e Actinium compounds
AcF₃ AcCl₃ AcBr₃ AcI₃ Ac₂O₃ Ac₂S₃ Ac(NO₃)₃ AcPO₄ AcOF AcOBr AcOCl Ac(OH)₃

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