Samarium(II) fluoride

Samarium(II) fluoride is one of fluorides of samarium with a chemical formula SmF₂. The compound crystalizes in the fluorite structure, and is significantly nonstoichiometric. Along with europium(II) fluoride and ytterbium(II) fluoride, it is one of three known rare earth difluorides, the rest are unstable.

Preparation

Samarium(II) fluoride can be prepared by using samarium or hydrogen gas to reduce samarium(III) fluoride:

$\mathrm{2}\mathrm{S}\mathrm{m}{\mathrm{F}}_{\mathrm{3}}\mathrm{+}\mathrm{S}\mathrm{m}\mathrm{⟶}\mathrm{3}\mathrm{S}\mathrm{m}{\mathrm{F}}_{\mathrm{2}}$

$\mathrm{2}\mathrm{S}\mathrm{m}{\mathrm{F}}_{\mathrm{3}}\mathrm{+}{\mathrm{H}}_{\mathrm{2}}\mathrm{⟶}\mathrm{2}\mathrm{S}\mathrm{m}{\mathrm{F}}_{\mathrm{2}}\mathrm{+}\mathrm{2}\mathrm{H}\mathrm{F}$

Properties

Samarium(II) fluoride is a purple to black solid. This is present in the crystal structure of the cubic calcium fluoride type (space group FmTemplate:Overlinem; No. 225 with a = 587.7 pm).

References

Template:Fluorides Template:Samarium compounds Template:Lanthanide halides