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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 Hg...Br 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...π contacts connect the mol­ecular layers along the c-axis direction.
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