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Related Experiment Videos

Experimental electron density in crystalline H3PO4

M Souhassou1, E Espinosa, C Lecomte

  • 1Medical Foundation of Buffalo, NY 14203, USA.

Acta Crystallographica. Section B, Structural Science
|October 1, 1995
PubMed
Summary

This study used X-ray diffraction to model electron density in orthophosphoric acid (H3PO4) crystals. Results show hydrogen bonding influences molecular symmetry and electron distribution, aligning with theoretical models.

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Area of Science:

  • Crystallography
  • Solid-state chemistry
  • Quantum chemistry

Background:

  • Orthophosphoric acid (H3PO4) is a fundamental chemical compound with complex crystal structures.
  • Understanding electron density distribution is crucial for elucidating chemical bonding and molecular interactions.
  • Previous neutron diffraction studies provided initial structural insights.

Purpose of the Study:

  • To precisely model the electron density distribution in orthophosphoric acid crystals using high-resolution X-ray diffraction data.
  • To investigate the influence of crystal packing and hydrogen bonding on the molecular symmetry and electronic structure of H3PO4.
  • To compare experimental deformation densities with theoretical calculations from molecular orbital wavefunctions.

Main Methods:

Related Experiment Videos

  • High-resolution X-ray diffraction data collection for H3PO4 crystals.
  • Modeling of electron density distribution using experimental data.
  • Adoption of hydrogen atom positions from prior neutron diffraction analysis.
  • Comparison of experimental results with theoretical calculations using polarized split-valence molecular orbital wavefunctions.

    • Main Results:

    • The electron density distribution was successfully modeled to 0.46 A resolution.
    • Despite crystal asymmetry, local pseudoatomic densities approached idealized molecular symmetry (C3v).
    • Experimental static deformation density closely matched theoretical calculations for an isolated H3PO4 molecule.
    • Hydrogen bonding was observed to polarize the P==O acceptor group and affect lone-pair density on P--OH groups.

    Conclusions:

    • X-ray diffraction provides a detailed view of electron density in H3PO4 crystals.
    • Crystal environment, particularly hydrogen bonding, significantly influences molecular electronic structure.
    • The study validates theoretical models of electron density in H3PO4 by comparing them with experimental data.