Qualitative Valence-Bond Descriptions of Electron-Rich Molecules: Pauling “3-Electron Bonds” and “Increased-Valence” Theory

  • R. D. Harcourt

Part of the Lecture Notes in Chemistry book series (LNC, volume 30)

Table of contents

  1. Front Matter
    Pages N2-X
  2. R. D. Harcourt
    Pages 100-107
  3. R. D. Harcourt
    Pages 206-216
  4. R. D. Harcourt
    Pages 217-224
  5. Back Matter
    Pages 259-260

About this book


This book provides qualitative molecular orbital and valence-bond descriptions of the electronic structures for electron-rich molecules, with strong emphasis given to the valence-bond approach. Electron-rich molecules form an extremely large class of molecules, and the results of quantum mechanical studies from different laboratories indicate that qualitative valence-bond descriptions for many of these molecules are incomplete in so far as they usually omit "long-bond" Lewis structures from elementary descriptions of bonding. For example, the usual representation for the electronic structure of the ground-state for 03 involves resonance between the (+1 o and Until standard Lewis structures ~ ~ (-I . b:'" ~d· . . . . , recently, any contribution to resonance of the "long-bond" (or spin-paired o •• / •• ,. . has been largely ignored. diradica~ Lewis structure However, it :0 . 0. . e-. . . . . ______ " has now been calculated to be a very important structure. For the ground-states of numerous other systems, calculations also indicate that "long-bond" structures are more important than is usually supposed, and therefore they should frequently be included in qualitative valence-bond descriptions of electronic structure. The book describes how this may be done, and some of the resulting consequences for the interpretation of the electronic structure, bond properties and reactivities of various electron-rich molecules. When appropriate, molecular orbital and valence­ bond descriptions of bonding are compared, and relationships that exist between them are derived.


Configuration Interaction Organische Chemie Planet Theoretische Chemie Valenzstrukturmethode Walden inversion chemical bond cluster cobalt metals molecule reactions structure theoretical chemistry wave

Authors and affiliations

  • R. D. Harcourt
    • 1
  1. 1.Department of Physical ChemistryUniversity of MelbourneParkvilleAustralia

Bibliographic information

  • DOI
  • Copyright Information Springer-Verlag Berlin Heidelberg 1982
  • Publisher Name Springer, Berlin, Heidelberg
  • eBook Packages Springer Book Archive
  • Print ISBN 978-3-540-11555-7
  • Online ISBN 978-3-642-93216-8
  • Series Print ISSN 0342-4901
  • Series Online ISSN 2192-6603
  • Buy this book on publisher's site