The reaction of Na2Fe(CO)4 with an excess of MnCl2 in tetrahydrofuran (THF) produced {Fe2Mn(C4H8O)2Na2(C4H8O)5(CO)8]n or C36H56Fe2MnNa2O15. The compound is a xenophilic dianion with short iron–manganese bond lengths of 2.6274 (10) and 2.6294 (10) Å. The sodium cations of the dianion are coordinated to THF ligands and have isocarbonyl interactions forming a polymeric (two-dimensional) structure in the crystal. One of the THF molecules was modeled with the carbon atoms being statistically disordered.
