Bis[1,2-bis(methoxycarbonyl)ethene-1,2-dithiolato-κ2S,S′]bis(η5-pentamethylcyclopentadienyl)tetra-μ3-sulfido-tetrairon(4 Fe–Fe) hexafluoridophosphate

The asymmetric unit of the title compound, [Fe4(C6H6O4S2)2(C10H15)2S4]PF6, contains two different complex cations and two PF6 anions. The two complex cations have similar conformations with the butterfly-like Fe4S4 core surrounded by two pentamethylcyclopentadienyl ligands and the S atoms of two dithiolate ligands. In each Fe4S4 core, there are four short Fe—Fe and two long Fe...Fe contacts, suggesting bonding and non-bonding interactions, respectively. The Fe—S distances range from 2.1287 (13) to 2.2706 (16) for one and from 2.1233 (13) to 2.2650 (16) for the other Fe4S4 core. The Fe—S distances involving the dithiolate ligands are in a more narrow range [2.1764 (16)–2.1874 (13) for one and 2.1743 (14)–2.1779 (16) for the other cation]. There are no significant interactions between cations and anions.