Pentacarbonyl-1κ2C,2κ3C-(μ-pyrazine-2,3-dithiolato-1:2κ4S,S′:S,S′)(trimethylphosphane-1κP)diiron(I)(Fe—Fe)

In the title compound, [Fe2(C4H2N2S2)(C3H9P)(CO)5], the Fe2S2 core adopts a butterfly conformation. The PMe3 ligand is coordinated in the basal position, roughly cis to the Fe—Fe bond. The Fe—Fe distance of 2.4970 (6) Å is relatively short compared to those (ca 2.53 Å) found in another monosubstituted diiron compound. A rigid planar dithiolate bridge is featured, with an angle of 2.78 (1)° between the Fe—Fe bond and the normal to the pyrazine-2,3-dithiolate plane