Acta Cryst. (2014). E70, m13 [ doi:10.1107/S1600536813032923 ]
Abstract: The asymmetric unit of the title compound, [Fe(C5H5)(C5H4BrHg)], contains two independent molecules, A and B, in which the Hg-C bond lengths are 2.045 (6) and 2.046 (6) Å, the Hg-Br bond lengths are 2.4511 (9) and 2.4562 (7) Å, and the C-Hg-Br angles are 176.42 (17) and 177.32 (17)°. The two cyclopentadienyl rings of molecule A are eclipsed, while those of molecule B are almost staggered. The HgBr groups are connected by intermolecular HgBr contacts of 3.3142 (9)-3.4895 (11) Å, forming layers parallel to (001). These layers contain both four-membered (HgBr)2 and eight-membered (HgBr)4 rings. Ferrocene-ferrocene C-H contacts connect the molecular layers along the c-axis direction.
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