3D model (JSmol)
CompTox Dashboard (EPA)
|Molar mass||215.65 g mol−1|
|Density||4.63 g cm−3, solid|
|Melting point|| 684 °C (1,263 °F; 957 K) (anhydrous) |
27 °C (Hexahydrate)
|Boiling point||934 °C (1,713 °F; 1,207 K)|
|117 g / 100 ml|
|Solubility in other solvents||THF, methanol, ethanol|
|Rhombohedral, hP3, SpaceGroup = P-3m1, No. 164|
|R-phrases (outdated)||R20 R36/37/38|
|S-phrases (outdated)||S26 S36|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
|(what is ?)|
Iron(II) bromide is an inorganic compound with the chemical formula FeBr2. The anhydrous compound is a yellow or brownish-colored paramagnetic solid. Several hydrates of FeBr2 are also known, all being pale colored solids. It is a common precursor to other iron compounds in research laboratory, but no applications exist for this compound.
Like most metal halides, FeBr2 adopts a polymeric structure consisting of isolated metal centers cross-linked with halides. It crystallizes with the CdI2 structure, featuring close-packed layers of bromide ions, between which are located Fe(II) ions in octahedral holes. The packing of the halides is slightly different from that for FeCl2, which adopts the CdCl2 motif.
FeBr2 is synthesized using a methanol solution of concentrated hydrobromic acid and iron powder. It adds the methanol solvate [Fe(MeOH)6]Br2 together with hydrogen gas. Heating the methanol complex in a vacuum gives pure FeBr2.