3d-4f Synthesis And Properties Of High-dimensional Coordination Polymer3d-4f Synthesis And Properties Of High-dimensional Coordination Polymer

There been growing interest in recent years in the design and synthesis of heterometallic complexes, such as 3d-4f polymeric systems, motivated by their fascination structural topology and the exploitable applications in the magnetism, luminescent materials, molecular adsorption and catalysis. However, the synthesis of polymeric complexes, especially three - dimensional open - framwork 3d - 4f heterometallic coordination polymers, is still less successful. In this thesis, seventeen 3d-4f heterometallic coordination polymers with 3D open-framework structure based on the middle flexible ligand 2-(1H-tetrazol-1-yl)acetic acid via hydrothermal reaction. In addition, eight polymers with seven different toplogy based on the rigid pyridine dicarboxylate ligand, also have hydrothermal synthesized. The magnetic behaviors for some compounds have been investigated. The findings as following:1. Three types of Ln-Ni heterometallic metal-organic frameworks with two different type of topology, including three true supermolecular isomers NiII-EuIII with the same general formula, have been hydrothermally and recrystallization synthesized by the reaction of Ln, Ni and Htza. These three series compound were mainly due to the selection of the ligand Htza and the use of recrystallization method. By using the recrystallization, we get the second series compound. By adding additive, the third serie compound was obtained. The magnetic behaviors of compound 1, 2 and 3 have been investigated.2. Six Co-Ln three-dimensional heterometallic coordination polymers with 1H-tetrazolyl-acetate ligand were achieved by using hydrothermal reaction and changing the metal rodes. Although these compounds have the same structure with the first series of Ni-Ln compound, they exhibit quite different magnetic properties.3. Eight polymers with three types of pyridine dicarboxylaic acid (2,3-pdc, 2,5-pdc and 3,5-pdc) were constructed via hydrothermal synthesis. Among them, Zn-La-2,3-pdc and Na-Ho-2,5-pdc are heteronuclear three-dimensional metal polymers. Co-3,5-pdc and Ni-3,5-pdc contains mixed-valence three core clusters acting as nine-connected modes. Three 4f three-dimensional polymers, La-2,5-pdc, Dy-3,5-pdc and Pr-3,5-pdc show three different topologies, fry, Rutile and pcu type. The magnetic properties of six compounds have been investigated.