Metal-organic Frameworks Based On1,3-β-diketone And Double Schiff-base Ligands: Synthesis, Structure, Characterization And Properties

The chemistry of metal-organic frameworks (MOFs) and coordination-drivensupramolecular complexes has recently become an active area in the chemical studies.Self-assembly of organic ligands and inorganic metal ions is one of the most efficientand widely used approaches for the construction of metal-organic frameworks. MOFsperformed in a variety of applications, such as adsorption, separation, catalysis andoptical materials. In this thesis, a series of1,3-β-diketone ligands and doubleSchiff-base ligands were used. The coordination chemistry based on these newligands and metal ions was investigated. Totally23new coordination compoundswere prepared and fully characterized by X-ray single-crystal diffraction powderedX-ray diffraction, IR, elemental analysis. The host-guset chemistry of the NbO-netZn-MOF was investigated in detail.Ⅰ. By changing the size ligand, a longer1,3-β-diketone ligand was synthesized.The structure of the new MOF was NbO-net. It was demonstrated that thecompound of1showed three different topology structures by templatingeffect of solvent. To some dergee, the different structures converted with eachother easily. For NbO-net dimension increasing, the guests with bigger sizewere put into1D channels: the compound1can encapsulate largemetal-complex species such as M(III) acetylacetonate (M=Eu and Fe) withthe guest-driven luminescent property; the luminescent intensity of host wasincreased a lot by the fluorescein guest; The azobenzene remained trans-azobenzene upon365nm UV irradiation. It was demonstrated that the host of1can prevent the azobenzene structural transformation.Ⅱ. By modified the functional group of ligand L1, the environment of1Dchannel in1was changed, which showed different function properties with1.The synthesis、self-Assembly based on some novel1,3-β-diketone ligandswere introduced in this thesis.Ⅲ. A series of symmetrical double Schiff-base ligands were synthesized based on the precursor of1,3-β-diketone ligands, by which, sixteen new MOFswere synthesized and their single crystal structures were investigated.We emphasized the function properties of1. The function properties of MOFscan be changed by modified the functional group of ligand. This study demonstratedthat the use of1,3-β-diketone and symmetrical ligands containing double schiff-baseunits as precursors to bind transition metals is in fact an efficient approach forsyntheses of novel MOFs with interesting chemical and physical properties.