Two new d10 metal-directed coordination polymers based on an unsymmetrical ligand 3-pyrimidin-5-ylbenzoic acid

Two novel d10 metal coordination polymers [Cd(3,5-PMBC)2(H2O)2] (1) and {[Zn(3,5-PMBC)2(H2O)2]⋅2H2O} (2) (3,5-PMBC = 3-pyrimidin-5-ylbenzoic acid) have been synthesized under solvothermal conditions, and characterized by IR spectroscopy, powder and single crystal X-ray diffractions. In 1 and 2, the d10 metal ions (Zn2+ and Cd2+) directed the self-assemblies to form two types of significantly different coordination structures: 1 exhibits one-dimensional double-stranded chain, while 2 displays a unique two-dimensional undulated double layer. Both are further stacked via hydrogen-bond interactions to assemble three-dimensional supramolecular structures. Thermal and photoluminescent properties of 1 and 2 are also investigated in details.