Syntheses, structures and properties of three dumbbell-shape Cadmium (II) complexes constructed by a tripodal ligand via hydrogen-bonding assembly

Three hydrogen-bonding frameworks based on Nsingle bondH⋯N and Nsingle bondH⋯O Hbond linkages have been synthesized and structurally characterized by using ntb (tris(2-benzimidazoylmethyl)amine) to react with two Cd(II) salts in the presence of dysfunctional bridging spacers of NaN3, 4ʹ4-bipy and H2tpa (terephthalic acid) respectively. The building blocks of three complexes exhibit dumbbell-shape which stacks each other in the lattice leading to three 3D hydrogen-bonding frameworks with diversiform topology net of distorted NaCl net, (4,4) layer and 424 · 64 net.