Bis{1-[(1H-benzimidazol-1-yl)meth-yl]-1H-imidazole-κN (3)}bis-(3,5-dicarb-oxy-benzoato-κ(2) O (1),O (1'))nickel(II) octa-hydrate.

In the title complex, [Ni(C9H5O6)2(C11H10N4)2]·8H2O, the Ni(II) ion exhibits site symmetry 2. It has a distorted octa-hedral coordination defined by two N atoms from two symmetry-related 1-[(1H-benzimidazol-1-yl)meth-yl]-1H-imidazole ligands and four O atoms from two symmetry-related 3,5-dicarb-oxy-benzoate anions. In the crystal, the complex mol-ecules and solvent water mol-ecules are linked via O-H⋯O, O-H⋯N and N-H⋯O hydrogen bonds, forming a three-dimensional structure. There are also a number of C-H⋯O inter-actions present.