Bis(1H-imidazole-κN3)bis(2-oxidopyridinium-3-carboxylato-κ2O2,O3)cobalt(II)

In the molecule of the title CoII complex, [Co(C6H4NO3)2(C3H4N2)2], the CoII atom is located on a twofold rotation axis and chelated by two oxidopyridiniumcarboxylate anions and further cis-coordinated by two imidazole ligands in a distorted octahedral geometry. The shorter C—O bond distance of 1.260 (2) Å suggests electron delocalization between the oxido group and the pyridinium ring. The uncoordinated carboxylate O atom links with the imidazole and pyridinium rings of adjacent molecules via N—H...O hydrogen bonding. Weak C—H...O hydrogen bonding is also present in the crystal structure.