Crystal structure of catena-poly[[[di­aqua­[1,2-bis(pyridin-4-yl)ethene]{4-[2-(pyridin-4-yl)ethen­yl]pyridinium}gold(I)iron(II)]-di-μ-cyanido] bis­[dicyanido­gold(I)] 1,2-bis­(pyridin-4-yl)ethene dihydrate]

In the title compound [Fe(bpe)(Hbpe)Au(CN)(2)][Au(CN)(2)](2)·bpe·2H(2)O}(n) [where bpe = 1,2-bis­(pyridin-4-yl)ethene, C(12)H(10)N(2)], the Fe(II) ion is coordinated in a distorted octa­hedral [FeN(4)O(2)] environment by two di­cyano­aurate anions, two water mol­ecules and two partially protonated 1,2-di(4-pyrid­yl)ethyl­ene mol­ecules. Di­cyano­aurate anions bridge the Fe(II) cations, forming infinite chains, which propagate along the a-axis direction. The chains are connected via aurophilic inter­actions with two non-coordinated di­cyano­aurate anions for each Fe(II) ion. The polymeric chains inter­act with each other via π–π stacking between the guest bpe mol­ecules and multiple hydrogen bonds.