Development of precise size-controlled synthesis of metal nanoclusters

聚丙烯亚胺（PPI）树状大分子的外围被大块取代基功能化，形成囊状树状大分子。在树状大分子的纳米空隙中，通过精确控制预组织的钯离子，可以制备亚纳米有序的钯簇。枝状大分子的相互作用可以调节Pd簇的电子态，从而影响Pd簇在烯烃加氢反应和烯丙基取代反应中的催化性能。

The periphery of the poly(propylene imine) (PPI) dendrimers were functionalizedwith bulky substituents to form capsular dendrimers. Within the nanovoids of the dendrimers, subnano ordered palladium clusters could be prepared by precise controlof the preorganized Pd ions. The electronic state of Pd cluster could be tuned with the interaction of the dendrimers, which affected the catalytic performances of the Pd clusters in the hydrogenation of olefins and allylic substitution reactions.