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Two luminescent Zn(II) and Cd(II) metal-organic frameworks (MOFs) containing 1,4,5,8-naphthalene tetracarboxylic acid (H 4 L’) and 4,4'-bipyridine (4bpy), [ZnL(4bpy) 0.5 (DMA)] n  ( 1 ) and [CdL(4bpy) 0.5 ] n  ( 2 ) (L = 1,8-monoanhydride-1,4,5,8-naphthalenetetracarboxylate, DMA = N,N-dimethyl acetamide), were synthesized and characterized through X-ray diffraction, IR, and UV-Vis spectroscopy.  1  shows a 1D linear chain structure, while  2  shows a 2D baluster structure. Both show multiple H bonding and π-stacking interactions. Both compounds show ligand-based luminescence in the range 400-500 nm with contributions from both ligands. The luminescence is strongly dependent on the presence of potentially coordinating molecules. Luminescence quenching experiments show good sensitivities in detecting nitrobenzene (NB), Fe 3+  and Cr 2 O 72− .

journal of coordination chemistry

Luminescent Zn(II) and Cd(II) coordination polymers based on naphthalene tetracarboxylic acid and 4,4'-bipyridine for sensing of nitrobenzene, Fe 3+  and Cr 2 O 7                  2−  ions