Acta Cryst. (2009). E65, m1563  [ doi:10.1107/S1600536809046996 ]

Bis(-2,2'-biimidazole-²N³:N^3')bis[aquacopper(I)] sulfate

X. Zhang, P. Wei, B. Hu, B. Li and C. Shi

Abstract: 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-HO and N-HO hydrogen bonds between the complex cation, the water molecule and the sulfate anion lead to the formation of a three-dimensional network.

Online 14 November 2009

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