Synthesis and characterization of one-dimensional coordination polymers, [M(sac)2(μ–pyz)(H2O)2] n [M=ZnII, CdII, pyz = pyrazine, and sac = saccharinate

Abstract

Two new coordination polymers, [M(sac)2(μ–pyz)(H2O)2] n [M=ZnII(1), CdII(2), pyz = pyrazine, and sac = saccharinate], have been prepared and characterized by elemental analysis, FTIR spectroscopy, thermal analysis and single crystal X-ray diffraction. Both complexes are isomorphous and crystallize in the triclinic P 1 space group. The metal(II) ions are octahedrally coordinated by two sac, two aqua and two pyz ligands. The sac ligands are N-coordinated, while the pyz ligands are bridges between the metal centers, leading to one-dimensional linear chains. Intra-chain M–M separations in 1 and 2 are 7.218 and 7.498 Å, respectively. The individual chains are linked by strong OW–H ··· O(sac) hydrogen bonds into two–dimensional layers, which are further assembled into three–dimensional supramolecular networks by aromatic π(sac) ··· π(sac) stackings interactions.