Bis(μ-2,2′-biimidazole-κ2N3:N3′)bis[aquacopper(I)] sulfate

In the structure of the title compound, [Cu2(C6H6N4)2(H2O)2]SO4, the asymmetric unit contains half each of two 2,2′-diimidazole ligands, one Cu+ cation, one water molecule and half of a sulfate anion (2 symmetry). The dinuclear complex is completed through a twofold rotation axis, leading to a twisted ten-membered ring molecule. The dihedral angle between the two symmetry-related 2,2′-diimidazole ligands is 23.6 (1)°. The copper centre is coordinated by two N atoms of two symmetry-related 2,2′-diimidazole ligands in an almost linear fashion. The water molecule exhibits a weak coordination to Cu+ with a more remote distance of 2.591 (2) Å. The distance between the two copper centres is 2.5956 (6) Å. O—H...O and N—H...O hydrogen bonds between the complex cation, the water molecule and the sulfate anion lead to the formation of a three-dimensional network