Synthesis, structure and photoluminescence of a 2-D cadmium (II) metal-organic framework: [Cd(μ4-NIPH)(μ2-OH2)]n (NIPH = 5-nitroisophthalate)

A cadmium metal-organic framework [Cd(μ4-NIPH)(μ2-OH2)]n (1) has been prepared by reaction of H2NIPH (H2NIPH = 5-nitroisophthalic acid) with Cd (II) under hydrothermal condition and characterized by single-crystal X-ray diffraction and TGA analysis. Single crystal X-ray diffraction analysis indicated that 1 is a 2-D layer structure constructed from polynuclear cadmium chains and bridge NIPH ligands. Furthermore, the layers are connected into 3-D supramolecular network through hydrogen bonds. The framework 1 exhibits photoluminescence at room temperature.