Cadmium(II)-N-Ethylimidazole Coordination Polymer via Different Coordination Environment and Chloro Bridges: Synthesis, X-ray Structure, Spectroscopic and Thermal Analysis

A novel coordination polymer Cd₂(μ-Cl)₄(Neim)₃]_n (1) (Neim = N-ethylimidazole) was synthesized and structurally characterized by means of elemental analysis, thermal analysis, FT-IR spectrum and single-crystal X-ray diffraction. There are two different cadmium centers in 1. One of these metal centers has octahedral geometry, while the other has square pyramidal geometry. Two Neim ligands are coordinated to the Cd(II) ion in octahedral geometry while one Neim ligand is coordinated to the Cd(II) ion in square pyramidal geometry. Relatively weak C–H···Cl interactions between N-ethylimidazole molecules and chloro ions in the complex play an important role in the construction of a three-dimensional supramolecular framework. Complex 1 exhibits photoluminescence emission in solid state at room temperature.