Actinium fluoride

Crystal structure
Names
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;3*1H/q+3;;;/p-3 Y InChI=1/Ac.3FH/h;3*1H/q+3;;;/p-3
SMILES F(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 , 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]

${\displaystyle {\ce {Ac(OH)3 + 3HF -> AcF_3(v) + 3H2O}}}$

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:

${\displaystyle {\ce {AcF3 + 2NH3 + H2O -> AcOF + 2NH4F}}}$

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