Synthesis,crystal structure and luminescence of novel two-dimensional interpenetrating frameworks

Two novel metal coordination polymers, Zn(nic)(isonic)]_n (1) and Cu(nic)(isonic)]_n (2) (H₂nic = nicotinic acid, H₂isonic = isonicotinic acid), have been hydrothermally synthesized and characterized by elemental analysis, IR, and single crystal X-ray diffraction. X-ray single-crystal structural analyses reveal that 1 and 2 are isomorphous, two-dimensional interpenetrating (4, 4) frameworks bridged by nic and isonic ligands, and further assembled into a three-dimensional supramolecular structure via π–π stacking interaction. Moreover, 1 displayed photoluminescent properties in the blue range at room temperature.