Synthesis and chracterization of new ion-exchangeable metal- organic framework materials

金属有机骨架（MOFs）是由多齿有机配体（主要通过配位键）连接的单个金属离子或多核金属簇构成的高度结晶的多孔材料。这种相对较新的材料家族，提供了小密度，巨大的表面积与体积比，可调的孔结构和功能化的灵活性，已发展成为化学和材料科学中最多产的新领域之一，吸引了广泛的工业和学术研究人员的关注，因为它们的有趣特性包括催化，药物递送，磁性，传感器，质子传导，特别是，气体（水、氢气、二氧化碳）吸附分离。现有多孔框架材料的许多应用依赖于通过离子交换进行合成后改性的能力，或者通过其显著增强。这种方法也在金属有机框架中进行了尝试;然而，其范围受到以下事实的限制：在迄今为止报道的数百种不同的M0 F中，已知进行离子交换的数量仍然是一个很小的子集。该项目将探索具有显著离子交换能力的新型MOF材料的合成和性能。这一关键性质本身就很重要，因为它可以促进例如有害有毒或放射性阳离子的去除和捕获，而且还可以微调上述许多有用的性质。

Metal-organic frameworks (MOFs) are highly crystalline porous materials constructed of single metal ions or polynuclear metal clusters linked by multidentate organic ligands, principally through coordinate bonds. This relatively new family of materials, which offers small density, huge surface to volume ratios, tunable pore structure and flexibility to be functionalized, has developed into one of the most prolific new fields in chemistry and materials science, attracting attention from a wide spectrum of industrial and academic researchers for their interesting properties including catalysis, drug delivery, magnetic, sensor, proton conduction and, in particular, gas (water, hydrogen, carbon dioxide) adsorption and separation. Many applications of existing porous framework materials either depend upon, or are considerably enhanced by, the ability to undergo post-synthetic modification by ion exchange. This approach has also been tried in metal-organic frameworks; its scope is limited, however, by the fact that, of the several hundred different MOFs that have hitherto been reported, the number known to undergo ion exchange remains a tiny subset. This project will explore the synthesis and properties of new MOF materials with significant ion-exchange capacity. This crucial property is of interest in its own right as it can facilitate, for example, the removal and trapping of harmful toxic or radioactive cations, but also enables the fine-tuning of the many useful properties mentioned above.