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Using SCOPE to Identify Potential Regulatory Motifs in Coregulated Genes
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On the interpretation of the source function.

Louis J Farrugia1, Piero Macchi

  • 1Department of Chemistry, University of Glasgow, Glasgow G12 8QQ, Scotland, UK. louis@chem.gla.ac.uk

The Journal of Physical Chemistry. A
|August 27, 2009
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Summary
This summary is machine-generated.

This study analyzes chemical information using the source function (SF), decomposing it into core and valence densities. Findings reveal core density

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Area of Science:

  • Quantum Chemistry
  • Chemical Physics
  • Computational Chemistry

Background:

  • The source function (SF) provides insights into chemical information within molecules.
  • Decomposition of SF into core and valence electron densities is crucial for understanding chemical bonding.
  • Kohn-Sham molecular orbital contributions to SF require detailed analysis.

Purpose of the Study:

  • To analyze the chemical information within the source function (SF) by decomposing it into core and valence electron densities.
  • To investigate the contributions of individual Kohn-Sham molecular orbitals to the SF.
  • To compare the orbital decomposition of SF at bond critical points with the delocalization index.

Main Methods:

  • Decomposition of the source function (SF) into relative contributions from core and valence electron densities.
  • Examination of both experimental and quantum-mechanically derived electron densities.
  • Orbital decomposition of the SF at bond critical points for atom pairs.
  • Comparison of SF orbital decomposition with the delocalization index (Δ).

Main Results:

  • Valence density typically dominates the SF for second and third-period elements.
  • Core density becomes increasingly significant for heavier elements, including transition metals.
  • Orbital contributions to SF are negligible near nodal planes, impacting pi-interaction interpretations.
  • SF(A-B)bcp shows distinct orbital contributions compared to Δ(ΩA, ΩB).

Conclusions:

  • The relative importance of core and valence densities in the SF varies with atomic number.
  • Interpretation of chemical concepts from SF features requires caution, particularly for heavier elements.
  • Understanding orbital contributions to SF is essential for accurate chemical bonding analysis.