Tokuda Shun, Furukawa Shuhei
Institute for Integrated Cell-Material Sciences, Kyoto University, Kyoto, Japan.
Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Kyoto, Japan.
Nat Chem. 2025 May;17(5):672-678. doi: 10.1038/s41557-025-01777-0. Epub 2025 Mar 18.
Open-framework materials are constructed by connecting molecular components via strong bonds. It is generally believed that non-covalent interactions are too weak to hold the building blocks and generate stable open voids. Here we show that van der Waals interactions enable the construction of robust three-dimensional frameworks, referred to as van der Waals open frameworks (WaaFs). The key to successful synthesis of WaaFs is the use of octahedral metal-organic polyhedra with size larger than 2 nm as building blocks and their packing into a sparse diamond network with large extrinsic porosity. The well-defined faces composed of multiple planar moieties increase the intermolecular contact area to achieve an interaction energy above 400 kJ mol. We show that the WaaFs exhibit high thermal stability and high specific surface area as well as framework assembly with a reversible nature.
开放框架材料是通过强键连接分子组件构建而成的。人们普遍认为，非共价相互作用太弱，无法支撑构建单元并产生稳定的开放空隙。在此，我们展示了范德华相互作用能够构建出坚固的三维框架，即范德华开放框架（WaaFs）。成功合成WaaFs的关键在于使用尺寸大于2纳米的八面体金属有机多面体作为构建单元，并将它们堆积成具有大外部孔隙率的稀疏金刚石网络。由多个平面部分组成的明确表面增加了分子间接触面积，以实现高于400 kJ mol的相互作用能。我们表明，WaaFs具有高热稳定性和高比表面积，以及具有可逆性质的框架组装。
