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Structural radii, electron-cloud radii, ionic radii and solvation

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Coordinative Interactions

Part of the book series: Structure and Bonding ((STRUCTURE,volume 15))

Abstract

A simple method is given for obtaining root-mean-square electron-cloud radii y r.m.s. from diamagnetism. Comparison of these with structural radii r shows that for ionic and van der Waals bonds, r is about twice y r.m.s. ; for localised covalent bonds they are about equal. Comparison with theory shows that electron-cloud radii are about the same for localised-bond atoms, or for ions in crystals, as for the free particles with a notable exception in the hydride anion.

This distinction between electron-cloud radii and structural radii is then used to refine the system of ionic radii due to Pauling and Goldschmidt. Some further examples of anion-anion contact are discussed, and a value deduced for the crystal radius of the hydride anion. These cases of anion-anion contact argue for the Pauling tradition and against the new electron-density-minimum (EDM) radii.

The paper ends with a short discussion of solvation-energies and argues that here also the EDM radii are the less suitable.

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Authors and Affiliations

  1. Department of Chemistry and Metallurgy, Royal Military College of Science, Shrivenham, Swindon, Wilts, Great Britain

    E. C. Baughan

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  1. E. C. Baughan
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© 1973 Springer-Verlag

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Baughan, E.C. (1973). Structural radii, electron-cloud radii, ionic radii and solvation. In: Coordinative Interactions. Structure and Bonding, vol 15. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0036783

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  • DOI: https://doi.org/10.1007/BFb0036783

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  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-540-06410-7

  • Online ISBN: 978-3-540-37739-9

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