Poly[octa-carbonyl-heptakis-(tetra-hydro-furan)-diironmanganesedisodium(2 Mn-Fe)].

The reaction of Na(2)Fe(CO)(4) with an excess of MnCl(2) in tetra-hydro-furan (THF) produced {Fe(2)Mn(C(4)H(8)O)(2)Na(2)(C(4)H(8)O)(5)(CO)(8)] (n) or C(36)H(56)Fe(2)MnNa(2)O(15). The compound is a xenophilic dianion with short iron-manganese bond lengths of 2.6274†(10) and 2.6294†(10)†à . The sodium cations of the dianion are coordinated to THF ligands and have isocarbonyl inter-actions forming a polymeric (two-dimensional) structure in the crystal. One of the THF mol-ecules was modeled with the carbon atoms being statistically disordered.