Synthesis, crystal structure and characterization of [Ca(L)(H ₂O)₂]_n constructed by flexible ligand 2-nitro-benzene-1,4-di(oxyacetate)

A new microporous coordination polymer [Ca(nbdo)(H₂O) ₂]_n, constructed by 2-nitro-benzene-1,4-di(oxyacetate), was obtained by a slow evaporation method and characterized by elemental analysis, FT-IR, single-crystal X-ray diffraction, DSC, TG-DTG and fluorescent spectral analysis. The crystal structure reveals that there is 1-D microporous channel, which is bridged by four kinds of hydrogen bonds to generate a 3-D supramolecular network. The thermal analysis of the complex shows that it began to lose water molecules at 375 K, and when the temperature was up to 550 K the framework of the coordination polymer began to collapse. The luminescence property was investigated and the complex shows photoluminescence in the solid state at room temperature, excited at 320 nm.