(IUCr) Crystallography Journals Online

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Acta Cryst. (2009). E65, m380-m381 [ doi:10.1107/S1600536809007764 ]

Diaquabis(2,2'-biimidazole)cobalt(II) 4,4'-dicarboxybiphenyl-3,3'-dicarboxylate

J. Kang, C.-C. Huang, L.-S. Zhai, X.-H. Qin and Z.-Q. Liu

Abstract: In the title compound, [Co(C₆H₆N₄)₂(H₂O)₂](C₁₆H₈O₈), the Co^II cation and the organic anion occupy different crystallographic inversion centres and, as a consequence, the asymmetric unit comprises two half-molecules. The benzene groups are coplanar. The four coordinating N atoms of the two bidentate biimidazole ligands define the equatorial plane of a slightly distorted octahedral CoO₂N₄ geometry, and the water O atoms lie in the axial coordination sites. Translational (a, $\\overline b$ ) and inversion-related symmetry operations link the Co complex molecules and the negatively charged carboxylate anions via intermolecular N-HO and O-HO hydrogen bonds into sheets parallel to ( $\\overline{1}$ 01). The coordinated water molecules connect the sheets through O-HO hydrogen bonds, forming a three-dimensional framework. In addition, two intramolecular O-HO hydrogen bonds are observed between the carboxyl and carboxylate groups.

Online 11 March 2009