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Bond orders between molecular fragments.

Adam J Bridgeman1, Christopher J Empson

  • 1Department of Chemistry, University of Hull, Kingston-upon-Hull, HU6 7RX, UK. a.j.bridgeman@hull.ac.uk

Chemistry (Weinheim an Der Bergstrasse, Germany)
|December 29, 2005
PubMed
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A new Mayer bond order method analyzes molecular fragment interactions, enabling detailed bonding analysis in complex systems. This tool quantifies interfragment bonding roles, especially in low-symmetry molecules.

Area of Science:

  • Quantum Chemistry
  • Computational Chemistry
  • Chemical Bonding Theory

Background:

  • Classical chemical concepts like bond order and valence are challenging to apply to molecular fragments.
  • Analyzing interfragment interactions, especially in complex or low-symmetry systems, requires advanced theoretical tools.

Purpose of the Study:

  • To extend the Mayer bond order concept for analyzing interactions between molecular fragments.
  • To provide a quantitative measure of bonding contributions within molecular systems, particularly for complex and low-symmetry structures.

Main Methods:

  • Developed an extension of the Mayer bond order applicable to molecular fragments.
  • Utilized symmetry-adapted linear combinations to analyze fragment interactions.
  • Applied the method to study bonding in symmetrical and mixed-sandwich complexes.

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Main Results:

  • The extended Mayer bond order quantifies interfragment interactions and the role of different bonding modes.
  • The approach successfully assesses contributions from each irreducible representation in high-symmetry systems.
  • It provides valuable insights into bonding in low-symmetry systems where sigma, pi, and delta roles are difficult to separate.

Conclusions:

  • The fragment bond order method offers a robust way to analyze chemical bonding between molecular fragments.
  • It is particularly useful for complex systems like sandwich complexes, offering insights independent of electron-counting methods.
  • The approach validates frontier-orbital theories and quantifies the contribution of each bonding interaction.