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Personal Historical Perspective on the Development of Electron Counting Rules for Boranes and Clusters and Ken Wade’s Contribution

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50th Anniversary of Electron Counting Paradigms for Polyhedral Molecules

Part of the book series: Structure and Bonding ((STRUCTURE,volume 187))

Abstract

2021 marks the 50th Anniversary of the publication by Ken Wade’s “The structural significance of the number of skeletal bonding electron-pairs in carboranes, the higher boranes and borane anions, and various transition metal carbonyl cluster compounds” in Chemical Communications. This paper played an important role in the development of cluster and polyhedral main group chemistry and through the isolobal analogy encouraged imaginative interconnections between main group, transition metal and organic chemistry. It has been cited more than 500 times and the rules which developed from this and related papers are introduced in all modern undergraduate inorganic textbooks. It is therefore appropriate to publish a set of reviews which illustrate the influence of these generalisations on modern inorganic chemistry and give those newer to the field an insight into how the ideas which Wade introduced evolved. The chapters also give a critical account of the limitations of the approach and suggest how the subject may develop in the future.

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Abbreviations

EHMO:

Extended Hückel molecular orbital theory

homo-lumo:

Highest occupied and lowest unoccupied molecular orbitals

MO:

Molecular orbital

PSEPT:

Polyhedral skeletal electron pair theory

sep:

Skeletal electron pair

VSEPR:

Valence shell electron pair repulsion theory

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Acknowledgements and Dedication

I would like to thank Roald Hoffmann, Alan Welch, Catherine Housecroft and Lin Zhenyang, for their helpful comments on the manuscript and all the students and postdocs who have helped and inspired me during the last 50 years. Whilst writing this review I was often reminded of the late and greatly missed Roy Johnston who co-authored in 1987 “Theoretical models of cluster bonding” which was also published in Structure and Bonding and has stood the test of time. His external D.Phil. examiner was Professor Kenneth Wade who recognised his breadth of knowledge, his grasp of the literature and his flair for theoretical chemistry. I dedicate this chapter to both of them who in their different ways greatly influenced the way I approached chemistry.

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    D. Michael P. Mingos

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    D. Michael P. Mingos

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Mingos, D.M.P. (2021). Personal Historical Perspective on the Development of Electron Counting Rules for Boranes and Clusters and Ken Wade’s Contribution. In: Mingos, D. (eds) 50th Anniversary of Electron Counting Paradigms for Polyhedral Molecules . Structure and Bonding, vol 187. Springer, Cham. https://doi.org/10.1007/430_2021_86

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