Hexacarbonyl-2κ(3) C,3κ(3) C-di-μ(3)-sulfido-tetra­kis­(tetra­hydro­furan-1κO)calcium­diiron(II)(Fe—Fe)

Reaction between [Fe(2)(μ-S(2))(CO)(6)] and [Ca(thf)(4)(dpp-BIAN)] [dpp-BIAN = 1,2-bis-(2,6-diisopropyl­phenyl­imino)­acenaphthene and thf = tetra­hydro­furan] proceeds as a redox process via a two-electron reduction of [Fe(2)(μ-S(2))(CO)(6)] and a two-electron oxidation of (dpp-BIAN)(2−), resulting in the formation of the title heterometallic trinuclear cluster, [CaFe(2)(μ(3)-S)(2)(C(4)H(8)O)(4)(CO)(6)], and neutral dpp-BIAN. In the cluster, the Ca(II) atom is connected to two S atoms of an Fe(2)S(2) core [Ca—S = 2.7463 (8) and 2.7523 (8) Å]. No Fe—Ca bonds are formed [Fe⋯Ca = 3.6708 (6) and 3.5802 (6) Å]. There are five close C–H⋯O–C contacts in the crystal structure.