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Interaction of acetic acid with solid water.

S Bahr1, A Borodin, O Höfft

  • 1Institut für Physik und Physikalische Technologien, Technische Universität Clausthal, D-38678 Clausthal-Zellerfeld, Germany.

The Journal of Physical Chemistry. B
|April 28, 2006
PubMed
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This study investigated acetic acid interactions with solid water on metal surfaces. Acetic acid forms cyclic dimers on ice, transitioning to polymer chains above 150 K without deprotonation.

Area of Science:

  • Surface Science
  • Physical Chemistry
  • Materials Science

Background:

  • Understanding the behavior of organic molecules on ice is crucial for atmospheric and astrochemistry.
  • Acetic acid (AA) is a prevalent organic acid found in various environments.
  • Investigating AA-water interactions on metal surfaces provides insights into fundamental surface processes.

Purpose of the Study:

  • To explore the interaction of acetic acid with solid water films on tungsten and gold surfaces at low temperatures.
  • To characterize the structural and electronic changes of acetic acid-water interfaces upon annealing.
  • To determine the adsorption behavior and potential deprotonation of acetic acid in the presence of water.

Main Methods:

  • Metastable impact electron spectroscopy (MIES) and Ultraviolet Photoelectron Spectroscopy (UPS) for electronic structure analysis.

Related Experiment Videos

  • Temperature-programmed desorption (TPD) to study desorption kinetics.
  • Fourier-transformed infrared spectroscopy (FTIR) for species identification and structural analysis.

    • Main Results:

    • Acetic acid adsorbs as cyclic dimers on solid water at 80 K.
    • Spectral changes above 120 K indicate rearrangement, attributed to acetic acid's glass transition around 130 K.
    • Above 150 K, acetic acid forms polycrystalline polymer chains, with water desorbing from underneath before acetic acid.

    Conclusions:

    • No water-induced deprotonation of acetic acid was observed under the studied conditions.
    • Water molecules initially adsorb by hydrogen bonding to the acetic acid network, not forming a separate water film.
    • The findings provide detailed insights into the interfacial behavior of acetic acid and water relevant to condensed phase chemistry.