Department of Chemistry, Texas A&M University, 3255 TAMU, College Station, Texas 77843-3255, USA.
Chemistry Department, College of Science, King Saud University, Riyadh 11451, Saudi Arabia.
Nat Commun. 2017 May 25;8:15356. doi: 10.1038/ncomms15356.
A major goal of metal-organic framework (MOF) research is the expansion of pore size and volume. Although many approaches have been attempted to increase the pore size of MOF materials, it is still a challenge to construct MOFs with precisely customized pore apertures for specific applications. Herein, we present a new method, namely linker labilization, to increase the MOF porosity and pore size, giving rise to hierarchical-pore architectures. Microporous MOFs with robust metal nodes and pro-labile linkers were initially synthesized. The mesopores were subsequently created as crystal defects through the splitting of a pro-labile-linker and the removal of the linker fragments by acid treatment. We demonstrate that linker labilization method can create controllable hierarchical porous structures in stable MOFs, which facilitates the diffusion and adsorption process of guest molecules to improve the performances of MOFs in adsorption and catalysis.
金属-有机骨架（MOF）研究的一个主要目标是扩大孔径和体积。尽管已经尝试了许多方法来增加 MOF 材料的孔径，但对于构建具有特定应用所需的精确定制孔径的 MOF 仍然是一个挑战。在此，我们提出了一种新的方法，即连接体不稳定化，来增加 MOF 的孔隙率和孔径，从而产生分级孔结构。最初合成了具有坚固金属节点和易断裂连接体的微孔 MOF。然后，通过易断裂连接体的分裂和酸处理去除连接体片段，在晶体中形成介孔，从而形成介孔。我们证明，连接体不稳定化方法可以在稳定的 MOF 中创建可控的分级多孔结构，这有利于客体分子的扩散和吸附过程，从而提高 MOF 在吸附和催化中的性能。
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