A two-dimensional photoluminescent cadmium(II) coordination polymer containing a new coordination mode of pyridine-2,3-dicarboxylate: Synthesis, structure and molecular simulations for gas storage and separation applications

Abstract

A novel two-dimensional (2D) coordination polymer, [Cd(μ-pydc)(2-meim)]n (1) (pydc=pyridine-2,3-dicarboxylate, 2-meim=2-methylimidazole) was synthesized and characterized by spectral methods (FT-IR and photoluminescence), elemental analysis, thermal analysis (TG, DTG and DTA) and single crystal X-ray diffraction techniques. Complex 1 displays a 2D layer structure through the linkage of bridging carboxyl oxygen and pyridine nitrogen atoms of the pydc ligand. Each Cd(II) center exhibits a distorted octahedral coordination environment with four carboxylate oxygen atoms and two nitrogen atoms from the pydc and 2-meim ligands. In 1, the pydc ligand exhibits a new coordination mode. The distances of adjacent Cd(II) atoms are 3.679 and 7.742Å. The 2D layers are further linked by C–H⋯π and π⋯π stacking to construct a 3D supramolecular structure. In order to assess the potential of 1 in gas storage and gas separation applications, molecular simulations were performed. Furthermore, 1 exhibits blue photoluminescence in the solid state at room temperature.