[(η⁵-C₅Me₅)₂Mo₂(μ-I)₄]⁺[FeI₄]⁻.[(η⁵-C₅Me₅)₂Mo₂I₂(μ-I)₂(μ-O)]

The title compound, tetra-μ-iodo-bis[(η⁵-pentamethylcyclopentadienyl)molybdenum](Mo-Mo) tetraiodoferrate(III) di-μ-iodo-μ-oxo-bis[iodo(η⁵-pentamethylcyclopentadienyl)molybdenum](Mo-Mo), forms as a by-product of the thermal decarbonylation of [(η⁵-C₅Me₅)MoI₃(CO)₂] in tetrahydrofuran. The source of the iron is an impurity in the [(η⁵-C₅Me₅)₂Mo₂(CO)₃]₂ starting material used to make the triiodide compound. The structure consists of three independent species, namely a [(η⁵-C₅Me₅)₂Mo₂(μ-I)₄]⁺ cation with two pentamethylcyclopentadienylmolybdenum moieties bridged by four iodide ligands, a tetrahedral [FeI₄]⁻ anion and a neutral dinuclear species comprising two pentamethylcyclopentadienyliodomolybdenum units bridged by two iodide and an oxo ligand. All three fragments sit on crystallographic mirror planes in the monoclinic space group P2₁/m.

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