Study On Structure And Properties Of Coordination Polymers By Biphenyl Polycarboxylic Acid Ligands

The rational design, syntheses and characterization of functional coordination polymers (CPs) have attracted more and more interests not only because of their fascinating structures, but also owing to their tremendous potential applications in gas storage, magnetism, ion exchange, microelectronics, nonlinear optics, and heterogeneous catalysis. There’s no doubt that there are a variety of factors influencing the topological architectures and properties of the coordination polymers, including the natures of metal ions, organic ligands, solvents, supermolecular forces and so on. Undoubtedly, the judicious selection of ligands plays the crucial role in the construction of novel coordination polymers (CPs) owing to their abundant coordination modes to satisfy the geometric requirement of metal centers in constructing fascinating structural architectures.In this article, the rigid ligands 3,3’,5-biphenyl-tricarboxylic acid(H3dptc) and 3, 5-di(3’,5’-dicarboxylphenyl)benozoic acid(H5DDCBA)were chosen as the main building block to construct coordination polymers(CPs). Each characteristic in their structure was studied respectively.We have successfully synthesized ten new coordination polymers based on the rigid linear ligand and N-donor dipyridyl ligand with appropriate metal salts under hydrothermal conditions, namely,{[Co1.5(dptc)(BIP)i.5(EtOH)]·H2O}n (1),{[Mn1.5(dptc) (BIP)(H2O)2]·2H2O}n (2),[Ni(Hdptc)(BIP)(H2O)3]n (3),{[Ni1.5(BIP)2(H2O)5]·(dptc)·6(H2O)}n (4),{[Cd(Hdptc)(BIP)]·2H2O}n (5) and {[Cd2(Hdptc)2(bpa)(H2O)2]·2H2O}n (6),{[Cd2(DDCBA)(DMA)(H2O)]·3DMA}n(7),{[Cd3(DDCBA)(H2O)]·3DMA}n (8), {[Zn2(DDCBA)]·3DMA}n (9) and {[Zn2(DDCBA)]·2DMA}n (10) which feature different architectures respectively. All these compounds were characterized by powder X-ray diffraction (PXRD), infrared spectra (IR), elemental analyses (EA) and thermogravimetric analyses (TGA). The potential luminescence, magnetic and adsorption properties of some compounds have also been tested and investigated.