Two topologically different 3D Cu ^II metal–organic frameworks assembled from the same ligands: control of reaction conditions

摘要： Bifunctional ligands containing both carboxylic and sulfonate groups can adopt versatile coordination modes to produce novel metal–organic frameworks (MOFs) with high-dimensional networks and interesting topologies. Using 2,20-disulfonylbiphenyl-4,40-dicarboxylic acid (H4L) as a linker and 4,40-bipyridine (4,40-bpy) as a co-ligand, two novel 3D CuII MOFs, {[Cu2(L)(4,40-bpy)2.5(H2O)](cid:2)1.7H2O}n, (1), and {[Cu2(L)(4,40-bpy)2](cid:2)DMA(cid:2)3H2O}n, (2), have been synthesized and structurally characterized by X-ray crystallography (DMA is N,N-dimethylacetamide). MOF (1) shows an unprecedented trinodal 4,4,5-connected network with the Schla¨ ?i symbol (4.62.73)(43.65.7.8)(6.73.8.10), while MOF (2) indicates a binodal 4,6-connected fsc network with the Schla¨ ?i symbol (44.610.8)(44.62). MOFs (1) and (2) were further characterized by elemental analysis, IR spectroscopy, powder X-ray diffraction and thermogravimetric analysis. MOF (1) shows a high water and chemical stability. The proton conductivity of (1) and CO2 adsorption of (2) were also investigated.