Metal–organic frameworks (MOFs) constructed from ZnII/CdII-2,2′-bipyridines and polycarboxylic acids: Synthesis, characterization and microstructural studies
摘要:
Metal-organic frameworks with the compositions [Zn(bpy)(bdc)(H2O)](n) 1, [Zn(bpy)(btec)(1/2)(H2O)](n) 2, [Cd(bpy)(bdc)(H2O)](n) 3 and [Cd(bpy)(btec)(1/2)(H2O)](n) 4 (H(2)bdc = 1,4-benzenedicarboxylic acid = terephthalic acid, H(4)btec = 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, Zn-II/Cd-II-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 I 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. (c) 2008 Elsevier Ltd. All rights reserved.