(IUCr) Crystallography Journals Online

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Acta Cryst. (2007). E63, m2008 [ doi:10.1107/S160053680703067X ]

Diaquabis(2,2'-biimidazole)cadmium(II) benzene-1,4-dicarboxylate

Q. W. Wang, W. Liang and Q. Wu

Abstract: In the title compound, [Cd(C₆H₆N₄)₂(H₂O)₂](C₈H₄O₄), the Cd^II atom (site symmetry $\\overline{1}$ ) is chelated by two 2,2'-biimidazole (H₂biim) ligands in the equatorial plane and two axial water molecules to result in a trans-CdN₄O₂ octahedral geometry. The complex dication and centrosymmetric benzene-1,4-dicarboxylate (bdc) dianion interact via O-HO and N-HO hydrogen bonds. Centrosymmetric aromatic [pi] - [pi] stacking involving one of the C₃N₂ rings of the H₂biim species also occurs with a short centroid-centroid separation of 3.4164 (14) Å.

Online 30 June 2007