Bis[1,2-bis­(eth­oxy­carbon­yl)ethene-1,2-dithiol­ato-κ²S,S′]bis­(η⁵-penta­methyl­cyclo­penta­dien­yl)tetra-μ₃-sulfido-diiron(IV)diiron(III)(3 Fe—Fe)

The title compound, [Fe₄(C₁₀H₁₅)₂(C₈H₁₀O₄S₂)₂S₄], contains a twisted Fe₄S₄ cubane-like core. A twofold rotation axis passes through the Fe₄S₄ core, completing the coordination of the four Fe atoms with two penta­methyl­cyclo­penta­dienyl ligands and two chelating dithiol­ate ligands. There are three short Fe—Fe and three long Fe...Fe contacts in the Fe₄S₄ core, suggesting bonding and non-bonding inter­actions, respectively. The Fe—S bonds in the Fe₄S₄ core range from 2.1523 (5) to 2.2667 (6) Å and are somewhat longer than the Fe—S bonds involving the dithiol­ate ligand.

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) Å for one and from 2.1233 (13) to 2.2650 (16) Å 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) Å for one and 2.1743 (14)–2.1779 (16) Å for the other cation]. There are no significant inter­actions between cations and anions.