Two Novel Benzenedicarboxylate-Metal Complexes: Synthesis, Crystal Structures, and Properties

Two new metal-organic frameworks, namely [Cd(3-NO2-bdc)(2,2 '-bpy)(H2O)center dot H2O](2) (1) and[Ni(3-NO2-bdc)(4,4 '-bpy)H2O](n) (2) (where 3-NO2-bdcH(2) = 3-nitro-1,2-benzenedicarboxylic acid, 2,2 '-bpy = 2,2 '-bipyridine, 4,4 '-bpy = 4,4 '-bipyridine), have been synthesized and structurally characterized. Complex 1 is a 0-dimensional (0D) framework, but face-to-face pi-pi stacking interactions and O-H center dot center dot center dot O hydrogen bonds extend these molecules into a 3D supramolecular framework. X-ray structure analysis reveals that complexes 2 exhibit a 2-dimensional (2D) network structure. Also, IR spectra, fluorescence properties, thermal decomposition process, and powder X-ray diffraction of the complexes were investigated.