Hexa-kis-(1H-imidazole-κN)iron(II) sulfate-1H-imidazole (1/2).

The asymmetric unit of the title compound, [Fe(C(3)H(4)N(2))(6)]SO(4)·2C(3)H(4)N(2), contains two complex cations, two sulfate anions and four imidazole mol-ecules. In both cations, the Fe(II) atom is coordinated by six monodentate imidazole ligands and exhibits a slightly distorted octa-hedral coordination geometry. The Fe-N distances [2.184 (4)-2.218 (4) Å] point to a high-spin state of the Fe(2+) ions. N-H⋯O hydrogen bonds between the ionic components generate a three-dimensional framework containing corrugated channels along [001], which are filled by N-H⋯N hydrogen-bonded imidazole chains.