Publisher Summary This is one of two articles in this volume that is concerned with the borane-carborane structural pattern. In the other, Williams has shown how the pattern reflects the coordination number preferences of the various atoms involved. The purpose of the present article is to note some bonding implications of the pattern, and to show its relevance to a wide range of other compounds, including metal clusters, metal-hydrocarbon 7∼ complexes, and various neutral or charged hydrocarbons. Boranes and carboranes may be regarded as cluster compounds in the sense defined by Cotton; they contain a finite group or skeleton of atoms held together entirely, mainly, or at least to a significant extent by bonding directly between those atoms, even though some other atoms may be associated intimately with the cluster. Examples of their structural pattern, however, can be found far beyond the confines of what is normally regarded as cluster chemistry, so this survey includes many systems not commonly referred to as clusters.

Structural and Bonding Patterns in Cluster Chemistry

Systematic analysis of structural data as a research technique in organic chemistry

4. Laplacian of the Electron Density 1592 5. AIM Properties 1593 IV. Topological Analyses of Experimental Densities 1593 A. Experimental versus Theoretical Topology 1593 1. Carbon−Carbon Bond 1593 2. Polar Bonds 1594 B. Reproducibility of the Experimental Topology 1596 1. Amino Acids and Oligopeptides 1596 2. Model Ambiguities 1598 C. Applications to Molecular Crystals 1599 1. Aromaticity in Carbon-Based Ring Systems 1599

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Chemical applications of X-ray charge-density analysis.

Wolf D. Stohrer

Papers

Cope rearrangement revisited

Bond-stretch isomerism and polytopal rearrangements in (CH)5+, (CH)5-, and (CH)4CO

Electronic structure and reactivity of strained tricyclic hydrocarbons

Aminobenzenes. 20. Experimental and theoretical aspects of the formation of radical cations from tripyrrolidinobenzenes and their follow-up reactions