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A new anisotropic force-field accurately models pyridine crystal structures, outperforming empirical models by predicting high-pressure phases. This advance offers a more realistic approach to understanding crystallization phenomena.

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Area of Science:

  • Computational chemistry
  • Materials science
  • Crystallography

Background:

  • Accurate modeling of molecular crystals is crucial for predicting material properties.
  • Existing force fields often struggle to capture subtle structural variations and phase transitions.

Purpose of the Study:

  • To develop and validate an anisotropic atom-atom force-field for pyridine.
  • To assess the force-field's performance in predicting experimental crystal structures and identifying new phases.
  • To compare the anisotropic model with isotropic potentials and empirical methods.

Main Methods:

  • Development of a distributed intermolecular force-field (DIFF) incorporating anisotropic atomic multipoles, polarizabilities, dispersion coefficients, and repulsion models derived from DFT dimer calculations.
  • Modeling of pyridine crystal structures and comparison with experimental data.
  • Crystal structure prediction studies to identify polymorphs and high-pressure phases.

Main Results:

  • The DIFF model accurately reproduces experimental pyridine crystal structures, comparable to isotropic potentials fitted to experimental data.
  • The DIFF model successfully predicted an unreported high-pressure phase of pyridine, which empirical potentials failed to identify.
  • Differences in modeled structures were comparable to temperature, pressure, and zero-point vibrational effects.

Conclusions:

  • The anisotropic DIFF model provides a more realistic representation of the pyridine pair potential energy surface for crystalline phases.
  • While successful, improvements in modeling many-body terms and addressing slight over-binding are needed.
  • The study highlights the complexity of crystallization modeling and the limitations of empirical potentials in capturing all relevant physical phenomena.