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.