Department of Chemistry, Ulsan National Institute of Science and Technology (UNIST).
Department of Chemistry, Ulsan National Institute of Science and Technology (UNIST);
J Vis Exp. 2023 Feb 10(192). doi: 10.3791/64978.
Because of their designability and unprecedented synergistic effects, core-shell metal-organic frameworks (MOFs) have been actively examined recently. However, the synthesis of single-crystalline core-shell MOFs is very challenging, and thus a limited number of examples have been reported. Here, we suggest a method of synthesizing single-crystalline HKUST-1@MOF-5 core-shells, which is HKUST-1 at the center of MOF-5. Through the computational algorithm, this pair of MOFs was predicted to have the matched lattice parameters and chemical connection points at the interface. To construct the core-shell structure, we prepared the octahedral- and cubic-shaped HKUST-1 crystals as a core MOF, in which the (111) and (001) facets were mainly exposed, respectively. Via the sequential reaction, the MOF-5 shell was well-grown on the exposed surface, showing a seamless connect interface, which resulted in the successful synthesis of single-crystalline HKUST-1@MOF-5. Their pure phase formation was proved by optical microscopic images and powder X-ray diffraction (PXRD) patterns. This method presents the potential of and insights into the single-crystalline core-shell synthesis with different kinds of MOFs.
由于其设计性和前所未有的协同效应，核壳金属有机骨架（MOF）最近受到了广泛关注。然而，合成单晶核壳 MOF 极具挑战性，因此仅有少数实例被报道。在这里，我们提出了一种合成单晶 HKUST-1@MOF-5 核壳的方法，其中 MOF-5 以 HKUST-1 为核。通过计算算法，这对 MOF 被预测具有匹配的晶格参数和界面处的化学连接点。为了构建核壳结构，我们制备了八面体和立方体形的 HKUST-1 晶体作为核 MOF，其中分别主要暴露（111）和（001）面。通过顺序反应，MOF-5 壳在暴露的表面上很好地生长，表现出无缝连接的界面，从而成功合成了单晶 HKUST-1@MOF-5。通过光学显微镜图像和粉末 X 射线衍射（PXRD）图谱证明了它们的纯相形成。该方法为不同类型的 MOF 的单晶核壳合成提供了潜力和见解。
