Teo B K, Zhang H
Department of Chemistry, University of Illinois at Chicago, Chicago, IL 60680, USA.
Proc Natl Acad Sci U S A. 1991 Jun 15;88(12):5067-71. doi: 10.1073/pnas.88.12.5067.
A systematic structural investigation of a new series of high-nuclearity Au-Ag clusters containing 25, 37, 38, and 46 metal atoms led to the description of these clusters as "clusters of clusters" based on vertex-sharing icosahedra as building blocks. Based on the observed structures, a growth sequence is proposed here for the formation of these secondary clusters (clusters of clusters) from a single 13-atom icosahedron to a 127-atom icosahedron of icosahedra via successive additions of vertex-sharing icosahedral units. This cluster-of-clusters growth mechanism parallels the atom-by-atom growth pathway for the primary clusters from a single atom to a 13-atom icosahedron. It is hypothesized that the formation of these clusters of clusters is a manifestation of the spontaneous self-organization and self-similarity processes often observed in nature. It is conceivable that the concept of cluster of clusters may be important in the intermediate stages of some cluster growth as exemplified by the polyicosahedral growth of Au-Ag supraclusters.
对一系列新的含有25、37、38和46个金属原子的高核金 - 银簇进行的系统结构研究表明，基于以顶点共享二十面体为构建单元，这些簇可被描述为“簇的簇”。基于观察到的结构，本文提出了一个生长序列，用于描述这些二级簇（簇的簇）从单个13原子二十面体通过连续添加顶点共享二十面体单元形成127原子二十面体的过程。这种簇的簇生长机制与初级簇从单个原子到13原子二十面体的逐个原子生长途径相似。据推测，这些簇的簇的形成是自然界中经常观察到的自发自组织和自相似过程的一种表现。可以想象，簇的簇的概念在某些簇生长的中间阶段可能很重要，如金 - 银超簇的多二十面体生长所示。
