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

金属有机骨架是由多齿有机配体连接的单金属离子或多核金属团簇构成的高结晶多孔材料，主要通过配位键连接。这种相对较新的材料家族，具有密度小、表面体积比大、可调节的孔隙结构和可功能化的灵活性，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，其有趣的特性包括催化、药物输送、磁性、传感器、质子传导，特别是气体（水、氢、氢）。二氧化碳的吸附和分离。现有多孔框架材料的许多应用要么依赖于，要么通过离子交换进行合成后修饰的能力大大增强。这种方法也在金属有机框架中进行了尝试；然而，它的范围是有限的，因为在迄今为止已报道的几百种不同的mof中，已知发生离子交换的数量仍然是很小的一部分。本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。这一关键特性本身就令人感兴趣，因为它可以促进，例如，去除和捕获有害的有毒或放射性阳离子，但也可以微调上述许多有用的特性。

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.