Metal–organic frameworks (MOFs) constructed from ZnII/CdII-2,2′-bipyridines and polycarboxylic acids: Synthesis, characterization and microstructural studies

Metal–organic frameworks with the compositions [Zn(bpy)(bdc)(H2O)]n1, [Zn(bpy)(btec)1/2(H2O)]n2, [Cd(bpy)(bdc)(H2O)]n3 and Cd(bpy)(btec)1/2(H2O)]n4 (H2bdc = 1,4-benzenedicarboxylic acid = terephthalic acid, H4btec = 1,2,4,5-benzenetetracarboxylic acid and bpy = 2,2′-bipyridine) have been synthesized and characterized using spectroscopic and single-crystal X-ray diffraction techniques. In these complexes, ZnII/CdII-2,2′-bipyridine units and carboxylate anions exists as nodes and spacers respectively. An infinite 1D zig-zag chain structure is observed for both complexes 1 and 3, whereas complexes 2 and 4 display a 3D supramolecular architecture. The complexes are found to be photoluminescent, porous and show significant thermal stability.

Graphical abstractAssembly of M(bpy)(NO3)2 · H2O (M = ZnII/CdII) separately with 1,4-benzenedicarboxylic acid and 1,2,4,5-benzenetetracarboxylic acid provides a series of photoluminescent porous metal complexes in zig-zag chain and 3D supramolecular architectures. These complexes are characterized by their single crystal X-ray diffraction studies along with their physico-chemical properties.Figure optionsDownload full-size imageDownload as PowerPoint slide