Bis(μ-2,2′-biimidazole-κ2 N 3:N 3′)bis-[aquacopper(I)] sulfate

Abstract

In the structure of the title compound, [Cu2(C6H 6N4)2(H2O)2]SO4, the asymmetric unit contains half each of two 2,2′-diimidazole ligands, one Cu+ cation, one water mol-ecule 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 mol-ecule. 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 mol-ecule 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 mol-ecule and the sulfate anion lead to the formation of a three-dimensional network.