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Chemical information from the source function.

Carlo Gatti1, Fausto Cargnoni, Luca Bertini

  • 1CNR-ISTM, Istituto di Scienze e Tecnologie Molecolari, via C. Golgi 19, 20133 Milano, Italy. c.gatti@istm.cnr.it

Journal of Computational Chemistry
|February 21, 2003
PubMed
Summary
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The source function quantifies atomic contributions to electron density, revealing insights into chemical bonding and molecular properties. This method effectively analyzes electron density distributions and classifies hydrogen bonds based on atomic contributions.

Area of Science:

  • Quantum Chemistry
  • Computational Chemistry
  • Chemical Physics

Background:

  • Electron density provides fundamental information about molecular structure and bonding.
  • Quantifying atomic contributions to electron density is crucial for understanding chemical phenomena.
  • Existing methods may lack the sensitivity or model independence to fully capture these contributions.

Purpose of the Study:

  • To apply and evaluate the utility of the source function as a tool for analyzing electron density.
  • To investigate atomic contributions to electron density in various chemical systems, including diatomics, clusters, and hydrogen bonds.
  • To demonstrate the source function's ability to provide chemically relevant information and classify interactions.

Main Methods:

  • Application of the model-independent source function to calculate atomic contributions to electron density.

Related Experiment Videos

  • Analysis of electron density at bond critical points in diatomic molecules (HX, LiX).
  • Investigation of electron density maxima in planar lithium clusters.
  • Classification of hydrogen bonds based on source contributions at the hydrogen bond critical point.

    • Main Results:

    • Source contribution from Hydrogen (H) to electron density at bond critical points decreases with increasing electronegativity of the bonded atom (X).
    • The source function serves as a sensitive index of atomic transferability in LiX diatomics, showing a constant percentage contribution from Lithium (Li).
    • In lithium clusters, the source function distinguishes between nuclear and non-nuclear electron density maxima.
    • A novel classification of hydrogen bonds is established based on source contributions, correlating with hydrogen bond strength and character (isolated, polarized-assisted, resonance-assisted, charge-assisted).

    Conclusions:

    • The source function is a practical and versatile tool for analyzing local and nonlocal features of electron density distributions.
    • It provides a physically meaningful and chemically appealing partitioning of electron density based on atomic contributions.
    • The source function offers a robust method for characterizing chemical bonds, atomic transferability, and intermolecular interactions like hydrogen bonds.