(2-Bromo-acet-yl)ferrocene.

In the title mol-ecule, [Fe(C(5)H(5))(C(7)H(6)BrO)], the C atoms of the substituted ring have disparate Fe-C bond lengths compared with the unsubstituted ring. In the bromo-acetyl residue, the Br and O atoms are co-planar [the O-C-C-Br torsion angle is 5.7†(4)°] and are syn to each other. Helical supra-molecular chains along the b axis are formed in the crystal structure mediated by C-H⋯O contacts; the carbonyl-O atom is bifurcated. The chains are linked into layers by C-H⋯π(unsubstituted ring) inter-actions that stack along the a-axis direction.