Bis[bis(diethylenetriamine)zinc (II)]hexacyanoferrate tetrahydrate

In the crystal structure of the title compound, [Zn(C4H13N3)2]2[Fe(CN)6]·4 H2O, the asymmetric unit is formed by a [Zn(dien)2]2+ cation (dien = diethylenetriamine, NH2CH2CH2NHCH2CH2NH2), water molecules and half of the [Fe(CN)6]4- anion which is related by inversion symmetry through the Fe atom. The geometry around the Zn and Fe atoms is distorted octahedral and octahedral, respectively. Intramolecular O-H···O hydrogen bonds involving the water molecules, and intermolecular O-H···N hydrogen bonds involving the water molecules and the anions, result in an infinite chain. Intramolecular O-H···O and N-H···N, and intermolecular O-H···N, N-H···O and N-H···N hydrogen bonds form a three-dimensional framework.