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Density functional theory based molecular-dynamics study of aqueous iodide solvation.

J M Heuft1, E J Meijer

  • 1Van't Hoff Institute for Molecular Sciences, Universiteit van Amsterdam, Nieuwe Achtergracht 166, NL-1018 WV Amsterdam, The Netherlands. heuft@science.uva.nl

The Journal of Chemical Physics
|September 17, 2005
PubMed
Summary

Iodide ions disrupt water structure, forming a weakly bonded, unstructured solvation shell with fast-moving water molecules. Intramolecular water properties remain unaffected by the ion.

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Area of Science:

  • Physical Chemistry
  • Computational Chemistry
  • Chemical Physics

Background:

  • Understanding ion-solvent interactions is crucial in various chemical and biological processes.
  • Iodide's role in aqueous solutions requires detailed molecular-level investigation.

Purpose of the Study:

  • To investigate the solvation structure and dynamics of iodide ions in water.
  • To analyze the influence of iodide on local water organization and hydrogen bonding.

Main Methods:

  • Density functional theory (DFT) based molecular-dynamics (MD) simulations were employed.
  • Analysis focused on the structural and dynamical properties of the first solvation shell.

Main Results:

  • Iodide exhibits a disruptive effect on the local water structure.

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  • Iodide-water hydrogen bonds are significantly weaker than water-water hydrogen bonds.
  • The solvation shell is unstructured, with surrounding water molecules exhibiting faster dynamics.
  • Intramolecular properties of water molecules near iodide are not altered.

    • Conclusions:

    • The repulsive iodide-water interaction leads to an unstructured solvation shell.
    • Water molecule dynamics are enhanced around the iodide ion.
    • The study provides insights into halide ion solvation in aqueous environments.