Zn(II) Metal-Organic Frameworks with a Long Spacer Ligand and a Tricarboxylate Coligand

The preparations and structural characteristics of three-dimensional Zn(II) metal-organic frameworks (MOFs) with dipyridyl-olefin and tricarboxylate are reported. The solvothermal reactions of zinc(II) nitrate hexahydrate, 1,4-bis [2-(4-pyridyl)ethenyl]benzene (bpeb), and 4,4',4",-benzene-1,3,5-triyl-tris(benzoic acid) (H(3)btb) furnished three Zn(II) MOFs (1-3) with new topologies. Depending on the temperature or mole-ratio variations, self-interpenetrated [Zn-2(bpeb)(btb)(OH)].DMF.H2O (1), noninterpenetrated [Zn-3(btb)(2)(bpeb)].xSolvent (2), and fourfold interpenetrated [Zn-2(Hbtb)(2)(bpeb)] [Zn-2(Hbtb)(2)(bpeb)] [Zn-4(Hbtb)(4)(bpeb)(2)] (3) structures were generated with different molecular building blocks. It is interesting that although all three MOFs contain the same metal cation, anion, and spacer ligand, they show different emissions due to structure and connectivity.