关于原子簇化合物的结构和成键能力的探讨,已有不少报道。本文建议用四个数(nxcπ)来描述包括原子簇在内的无机和有机分子的结构类型并提出六条有关的规则。规则1:数以百万计的包括原子簇在内的有机和无机分子可认为由若干分子片(molecular fragments)M~i 所组成。分子片 M~i 由中心原子 A~j 和若干配体 L~k所组成,此处 i、j、k 为价电子数,例如: There have been many reports on the structure of the cluster compounds and the bonding ability. This paper suggests that the four numbers (nxcπ) be used to describe the structure types of inorganic and organic molecules including clusters and to propose six related rules. Rule 1: Millions of organic and inorganic molecules, including clusters, are thought to consist of several molecular fragments, M ~ i. Molecular M ~ i consists of a central atom A ~ j and a number of ligands L ~ k, where i, j, k is the valence number, for example: