Date Published: June 01, 2011
Publisher: International Union of Crystallography
Author(s): Ying Wang, Xin-Lian Gao.
In the title complex, [Co(C12H8N4O8)(H2O)2], the CoII atom is coordinated by two N and two O atoms of the tetradentate 5,5′-dicarboxy-2,2′-(ethane-1,2-diyl)bis(1H-imidazole-4-carboxylate) anion. The slightly distorted octahedral coordination environment is completed by the O atoms of two water molecules in axial positions. An intramolecular O—H⋯O hydrogen bond between the carboxy and carboxylate groups stabilizes the molecular configuration. Adjacent molecules are linked through O—H⋯O and N—H⋯O hydrogen bonds between the carboxy/carboxylate groups, water molecules and imidazole fragments into a three-dimensional network.
For background to complexes based on 1H-imidazole-4,5-dicarboxylic acid and its derivatives, see: Das et al. (2010 ▶); Sun et al. (2010 ▶); Zhang et al. (2010 ▶).