Crystal structure of catena-poly[[gold(I)-μ-cyanido-[di­aqua­bis­(2-phenyl­pyrazine)­iron(II)]-μ-cyanido] dicyanidogold(I)]

In the title polymeric complex, {[Fe(CN)(2)(C(10)H(8)N(2))(2)(H(2)O)(2)][Au(CN)(2)]}(n), the Fe(II) ion, which is located on a twofold rotation axis, has a slightly distorted FeN(4)O(2) octa­hedral geometry. It is coordinated by two phenyl­pyrazine mol­ecules, two water mol­ecules and two di­cyano­aurate anions, the Au atom also being located on a second twofold rotation axis. In the crystal, the coordinated di­cyano­aurate anions bridge the Fe(II) ions to form polymeric chains propagating along the b-axis direction. In the crystal, the chains are linked by O(water)—H⋯N(di­cyano­aurate anions) hydrogen bonds and aurophillic inter­actions [Au⋯Au = 3.5661 (3) Å], forming layers parallel to the bc plane. The layers are linked by offset π–π stacking inter­actions [inter­centroid distance = 3.643 (3) Å], forming a supra­molecular metal–organic framework.