| In the ongoing quest for the design of functional materials, metal-orgainc materials have been identified as potential platforms materials for their exploitable applications in magnetism, luminescence materials, molecular adsorption, and bimetallic catalysis, etc. Novel coordination polymers constructed from appropriate metal ions and multifunctional organic ligands via hydrothermal reaction have been shown to be amenable to sysytematic intriguing structures and properties. In this thesis, four kinds of organic carboxylic ligands were used to build a variety of dimensions of coordination polymers with metal ions. Their structures were determined by X-ray diffraction and some of their magnetic properties have been investigated. The work includes the following aspects:Twleve polymers constructed from rigid ligand 1H-benzo[d]imidazole-5,6- dicarboxylic acid (H3bidc) and M/Ln in different dimensional have been prepared, including a rare one dimensional helical chain. The characteristics of the ligand were reported in detail. According to the different structures of the compounds, the factors influencing on the structures have been discussed such as the reaction temperature, solvent molecules, counter anions etc. Magnetic properties of some compounds were studied. Two isomorphisms exhibit different magnetic phenomena. A series of complexes with 1H-imidazole-4,5-dicarboxylic acid and benzene-1,2,4-tricarboxylic acid were achieved, and the role of secondary ligand were discussed.Six three dimensional polymers were constructed from the flexible ligand 2-(1H-tetrazol-1-yl)acetic acid including a pair of supramolecular isomerisms, two polymers with high symmetry: one based on the Cu3(OH) belonging to the cubic crystal system, another consists of mix-valence Mn3O unit. It is note that the polymers build up via flexible ligand are very rare. The characteristics of the structures and the different in reaction conditions have been discussed. Some of the magnetic properties of compounds were studied, focusing on the isomerisms (Mn,Co and Ni). Interestingly, they have the same close-up of the M?OOC chains but exhibit three different magnetic phenomena. |
