Layered zinc (II) and cadmium (II) dicarboxylates with aromatic chelate ligand-syntheses, crystal structures and luminescent properties

Two new two-dimensional (2D) layered d10 metal coordination polymers, [M(PDB)(2,2′-bpy)]n (M=Zn2+ (1) and Cd2+ (2), PDB=pyridine-3,4-dicarboxylate), have been prepared by hydrothermal reaction and characterized by IR, TGA, and single-crystal X-ray diffraction analysis. Compounds 1 and 2 both exhibit puckered hexagonal (6,3) sheets and represent the first examples of 2D structures formed by PDB and chelate heterocyclic ligand. Furthermore, both of them show intense luminescent properties at room temperature.