Bis[1,2-bis-(meth-oxy-carbon-yl)ethene-1,2-dithiol-ato-κ(2) S,S']bis-(η(5)-penta-methyl-cyclo-penta-dien-yl)tetra-μ3-sulfido-tetra-iron(4 Fe-Fe) hexa-fluoridophosphate.

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 penta-methyl-cyclo-penta-dienyl ligands and the S atoms of two dithiol-ate ligands. In each Fe4S4 core, there are four short Fe-Fe and two long Fe⋯Fe contacts, suggesting bonding and non-bonding inter-actions, respectively. The Fe-S distances range from 2.1287†(13) to 2.2706†(16)†à for one and from 2.1233†(13) to 2.2650†(16)†à for the other Fe4S4 core. The Fe-S distances involving the dithiol-ate ligands are in a more narrow range [2.1764†(16)-2.1874†(13)†à for one and 2.1743†(14)-2.1779†(16)†à for the other cation]. There are no significant inter-actions between cations and anions.