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Density-functional theory-based molecular simulation study of liquid methanol.

Jan-Willem Handgraaf1, Evert Jan Meijer, Marie-Pierre Gaigeot

  • 1van't Hoff Institute for Molecular Sciences, University of Amsterdam, Nieuwe Achtergracht 166, 1018 WV Amsterdam, The Netherlands.

The Journal of Chemical Physics
|November 20, 2004
PubMed
Summary

This study used density-functional theory molecular dynamics to investigate liquid methanol. Results reveal key insights into hydrogen bonding, vibrational modes, and dielectric properties, aiding empirical potential development.

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Area of Science:

  • Computational Chemistry
  • Materials Science
  • Physical Chemistry

Background:

  • Understanding the behavior of liquid methanol is crucial for various chemical processes.
  • Accurate molecular-level descriptions are needed to refine computational models.
  • Existing empirical potentials require validation and improvement based on fundamental properties.

Purpose of the Study:

  • To perform a density-functional theory based molecular dynamics simulation of liquid methanol.
  • To investigate the structural, dynamical, and electronic properties of methanol under ambient conditions.
  • To provide data for the improvement of empirical potentials used in molecular simulations.

Main Methods:

  • Employed density-functional theory (DFT) based molecular dynamics (MD).

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  • Calculated radial distribution functions (RDFs) for oxygen and hydroxyl hydrogen.
  • Analyzed vibrational modes (hydroxyl-stretching and bending) and molecular dipole moment.

    • Main Results:

    • Observed pronounced hydrogen bonding in liquid methanol, consistent with neutron diffraction data.
    • Identified significant redshift in hydroxyl-stretching and blueshift in hydroxyl-bending modes, matching infrared spectroscopy.
    • Calculated a relative permittivity of 32, closely matching the experimental value of 33.

    Conclusions:

    • The DFT-MD study accurately reproduces key structural and dynamical properties of liquid methanol.
    • The enhanced molecular dipole moment and its fluctuations are significant.
    • The computed properties offer valuable data for refining empirical potentials for methanol simulations.