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In the structure of the title compound, [Cu 2 (C 6 H 6 N 4 ) 2 (H 2 O) 2 ]SO 4 , 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.

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

Bis(μ-2,2′-biimidazole-κ²N³:N^3′)bis[aquacopper(I)] sulfate