Two topologically different 3D Cu II metal-organic frameworks assembled from the same ligands: Control of reaction conditions

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 2,2′-di­sulfonylbi­phenyl-4,4′-di­carb­oxy­lic acid (H 4 L) as a linker and 4,4′-bi­pyridine (4,4′-bpy) as a co-ligand, two novel 3D Cu II MOFs, {[Cu 2 (L)(4,4′-bpy) 2.5 (H 2 O)]·1.7H 2 O} n, (1), and {[Cu 2 (L)(4,4′-bpy) 2 ]·DMA·3H 2 O} 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 topology network with the Schläfli symbol (4.6 2.7 3)(4 3.6 5.7.8)(6.7 3.8.10), while MOF (2) indicates a binodal 4,6-connected fsc network with the Schläfli symbol (4 4.6 10.8)(4 4.6 2). 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 CO 2 adsorption of (2) were also investigated.