Abstract

A method is described for constructing qualitatively the molecular orbitals of an approximately spherical cluster of boron or transition-metal atoms. The method gives a way of understanding the electron-counting rules for such clusters, the preference for deltahedral structures, the relationship between closo boranes on the one hand and nido and arachno boranes on the other, and Mingos' capping and condensation principles for transition-metal clusters.

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