Ruthenium nanoparticles (Ru NPs) with a face-centered-cubic (fcc) structure exhibit high catalytic activity in a number of reactions. In order to obtain highly crystalline and reactive fcc Ru NPs, we applied an anionic porous coordination cage (PCC-2) to encapsulate them and tune their crystal structures. The cage was assembled with six vertex ligands (V) and eight panel ligands (L), creating a truncated octahedral inner cavity 2.5 nm in diameter. As a result of electrostatic attraction, Ru³⁺ ions were encapsulated within the cavity of PCC-2. By an in situ reduction, metal atoms in the cavity of PCC-2 formed ultra-fine fcc Ru NPs, which were uniform in size. The as-synthesized Ru [email protected] composite exhibited record-high catalytic activity in methanolysis of ammonia borane, which is critically important in chemical hydrogen storage. This offers a new way of forming stable metal nanoclusters with ultra-small size and desirable structure within the cavities of a soluble porous material.

具有面心立方（fcc）结构的钌纳米粒子（Ru NPs）在许多反应中均显示出高催化活性。为了获得高结晶度和反应性的fcc Ru NP，我们应用了阴离子多孔配位笼（PCC-2）对其进行封装并调整其晶体结构。将笼子与六个顶点配体（V）和八个面板配体（L）组装在一起，形成直径为2.5 nm的截头八面体内腔。由于静电吸引，Ru ³⁺离子被封装在PCC-2的空腔内。通过原位还原，PCC-2腔中的金属原子形成超细fccRu NP，大小一致。合成后的Ru [受电子邮件保护的]复合物在氨硼烷的甲醇分解中表现出创纪录的高催化活性，这在化学氢存储中至关重要。这提供了在可溶性多孔材料的腔内形成具有超小尺寸和所需结构的稳定金属纳米簇的新方法。