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Related Experiment Videos

A conversation on VB vs MO theory: a never-ending rivalry?

Roald Hoffmann1, Sason Shaik, Philippe C Hiberty

  • 1Department of Chemistry and Chemical Biology, Cornell University, Baker Laboratory, Ithaca, New York 14853-1301, USA.

Accounts of Chemical Research
|October 22, 2003
PubMed
Summary

Valence bond (VB) theory and molecular orbital (MO) theory are two quantum mechanics approaches in chemistry. This discussion explores their historical rivalry and current understanding of molecular bonding.

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Area of Science:

  • Quantum chemistry
  • Theoretical chemistry

Background:

  • Quantum mechanics introduced two primary theories for chemical bonding: valence bond (VB) theory and molecular orbital (MO) theory.
  • These theories emerged concurrently, fostering distinct theoretical frameworks and research communities within chemistry.

Purpose of the Study:

  • To explore the historical development and ongoing dialogue between VB and MO theories.
  • To understand the evolution of these two fundamental approaches to describing molecular bonding.

Main Methods:

  • Discussion among practitioners of both VB and MO theories.
  • Historical analysis of theoretical development.
  • Epistemological examination of chemical bonding concepts.

Main Results:

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  • Theories of VB and MO have competed historically, shaping the conceptual landscape of chemistry.
  • Ongoing dialogue reveals nuances and potential for synthesis between the two approaches.
  • Practitioners share insights into the past and present of molecular bonding descriptions.

Conclusions:

  • VB and MO theories represent competing yet complementary perspectives in quantum chemistry.
  • Understanding their historical divergence and convergence is key to advancing chemical bonding theory.
  • The dialogue highlights the dynamic nature of scientific understanding in theoretical chemistry.