Poly[diaquabis(μ3-1H-benzimidazole-5,6-dicarboxylato-κ4N3:O5,O5′:O6)bis(μ2-1H,3H-benzimidazolium-5,6-dicarboxylato-κ3O5,O5′:O6)digadolinium(III)]

Abstract

In the title complex, [Gd2(C9H4N2O4)2(C9H5N2O4)2(H2O)2]n, two of the benzimidazole-5,6-dicarboxylate ligands are protonated at the imidazole groups. Each GdIII ion is coordinated by six O atoms and one N atom from five ligands and one water molecule, displaying a distorted bicapped trigonal-prismatic geometry. The GdIII ions are linked by the carboxylate groups and imidazole N atoms, forming a layer parallel to (001). These layers are further connected by O—H...O and N—H...O hydrogen bonds into a three-dimensional supramolecular network.