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

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Author(s): Jie Kang | Chang-Cang Huang | Lai-Sheng Zhai | Xiao-Huan Qin | Zhong-Qian Liu

Journal: Acta Crystallographica Section E
ISSN 1600-5368

Volume: 65;
Issue: 4;
Start page: m380;
Date: 2009;
Original page

ABSTRACT
In the title compound, [Co(C6H6N4)2(H2O)2](C16H8O8), the CoII 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—H...O and O—H...O hydrogen bonds into sheets parallel to (overline{1}01). The coordinated water molecules connect the sheets through O—H...O hydrogen bonds, forming a three-dimensional framework. In addition, two intramolecular O—H...O hydrogen bonds are observed between the carboxyl and carboxylate groups.
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