Post-synthetic Modification And Crystalline Molecular Flask For Metal-Organic Frameworks

Much of the initial enthusiasm and direction on metal-organic frameworks (MOFs) over the past decades has transform from design and synthesis, structural characterization to exploration for the potential applications, which have begun to flourish in areas including gas storage, catalysis, luminescence, biotechnology and so on. In principle, using crystal engineering, we could obtain novel functional metal organic materials (MOMs) via direct methods. Recently, post-synthetic modification (PSM) and crystalline molecular flask (CMF) are widely applied in the areas in construction and restructure of MOFs (central metal ions, organic linkers, pores surface), to produce novel MOMs with structural diversity and more excellent function. For example, metal ion exchange can make previously inert MOFs catalytically active, or improve the gas sorption properties of the framework. Therefore, it is of great interest to provide simple and feasible approaches to create isomorphous MOFs containing various metal ions that cannot be obtained by direct synthesis. In addition, some examples of porous MOFs sensing suitable guest molecules, leads to unprecedented modification in fluorescence properties, which are potential luminescent materials candidates.Six following parts are including in this work:1. The asymmetric rigid pyridine carboxylic ligand and divalent metal ions are employed to obtain complicated and intriguing metal organic network structures under the appropriate solvent-thermal conditions by self-assembly.2. In view of the guest molecule capture and exchange mostly occuring at room temperature, we investigated in the field of exploration and research at high temperature.3. Self-assembly of the rigid nitrogen heterocyclic organic ligand and specific metal ions at high temperature under solvent thermal conditions and invesgation on diversity and correlation of the structures.4. According to the structure characteristics, we further make an investigation on the extension of the resulting MOFs, but also magnetic, optical, and catalytic properties before or after small inorganic molecules sensing and guest molecules capture.5. Upon single crystal to single crystal process to explore the structure transformation, it provides a new way to obtain novel metal organic frameworks. 6.Introducing different aromatic carboxylic ligands premise that rigid nitrogen heterocyclic organic ligand and metal ion are adopting leads to the structures with diversity and related structural transformation.