Crystal structure of high-spin tetraaquabis(2-chloropyrazine-κN4)iron(II) bis(4-methylbenzenesulfonate)

The title salt, [FeII(C4H3ClN2)2(H2O)4](C7H7O3S)2, contains a complex cation with point group symmetry 2/m. The high-spin FeII cation is hexacoordinated by four symmetry-related water and two N-bound 2-chloropyrazine molecules in a trans arrangement, forming a distorted FeN2O4 octahedron. The three-dimensional supramolecular structure is supported by intermolecular O—H...O hydrogen bonds between the complex cations and tosylate anions, and additional π–π interactions between benzene and pyrazine rings. The methyl H atoms of the tosylate anion are equally disordered over two positions