Assembly of ZnII and CdII coordination polymers with different dimensionalities based on the semi-flexible 3-(1H-benzimidazol-2-yl)propanoic acid ligand

Abstract

Two new coordination polymers, namely, poly[[μ3-3-(1H-benzimidazol-2-yl)propionato]zinc(II)], [Zn(C10H8N2O2)]n, (1), and poly[bis[μ2-3-(1H-benzimidazol-2-yl)propionato]cadmium(II)], [Cd(C10H8N2O2)2]n, (2) have been synthesized from 3-(1H-benzoimidazol-2-yl)propanoic acid ligands through a mixed-ligand synthetic strategy under a solvothermal environment, and studied by single-crystal X-ray diffraction. Complex 1 crystallizes in the orthorhombic space group Pbca and features a two-dimensional structure formed by a binuclear Zn2O4 core. Complex 2, however, crystallizes in the monoclinic space group P21/c and forms a one-dimensional chain structure. The ZnII and CdII ions have different coordination numbers and the 3-(1H-benzoimidazol-2-yl)propanoate ligands display different coordination modes. The structures reported here show the importance of the selection of metal ions and suitable ligands.

Keywords

• crystal structure
• two-dimensional coordination polymers
• ZnII
• one-dimensional coordination polymers
• CdII
• MOFs