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

Jie Kang,Chang-Cang Huang,Xiao-Huan Qin,Lai-Sheng Zhai,Zhong-Qian Liu

doi:10.1107/s1600536809007764

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,) 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 (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.

Highlights

CoII cation and the organic anion occupy different crystallographic inversion centres and, as a consequence, the asymmetric unit comprises two half-molecules
O atoms lie in the axial coordination sites
The coordinated water molecules connect the sheets through O—H O hydrogen bonds, forming a three-dimensional framework

Summary

Crystal data

R factor = 0.033; wR factor = 0.087; data-to-parameter ratio = 11.5. CoII cation and the organic anion occupy different crystallographic inversion centres and, as a consequence, the asymmetric unit comprises two half-molecules. 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,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 (101). The coordinated water molecules connect the sheets through O—H O hydrogen bonds, forming a three-dimensional framework. Two intramolecular O—H O hydrogen bonds are observed between the carboxyl and carboxylate groups

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Special details