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In the title complex, [Co(C 12 H 8 N 4 O 8 )(H 2 O) 2 ], the Co II  atom is coordinated by two N and two O atoms of the tetra­dentate 5,5′-dicarb­oxy-2,2′-(ethane-1,2-di­yl)bis­(1 H -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.

Diaqua[5,5′-dicarboxy-2,2′-(ethane-1,2-diyl)bis(1H-imidazole-4-carboxylato)]cobalt(II)