科研之友
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摘要
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 NPs@PCC-2 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.
