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Ester formation at the liquid-solid interface.

Nguyen T N Ha1, Thiruvancheril G Gopakumar2, Nguyen D C Yen1

  • 1Solid Surfaces Analysis Group, Institute of Physics, Technische Universität Chemnitz, D-09107 Chemnitz, Germany.

Beilstein Journal of Nanotechnology
|November 2, 2017
PubMed
Summary
This summary is machine-generated.

This study observed catalyst-free esterification in a molecular monolayer at the liquid-solid interface. The reaction was triggered by increased molecular packing density or deposition temperature, confirmed using scanning tunneling microscopy.

Keywords:
on-surface reactionscanning tunneling microscopytrimesic acidundecan-1-ol

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Area of Science:

  • Surface chemistry
  • Materials science
  • Organic chemistry

Background:

  • Molecular monolayers at interfaces are crucial for various applications.
  • Understanding interfacial reactions is key to controlling material properties.
  • Catalyst-free reactions offer greener synthetic pathways.

Purpose of the Study:

  • To investigate catalyst-free esterification within a coadsorbed molecular monolayer.
  • To determine the conditions triggering esterification at the liquid-solid interface.
  • To elucidate the role of molecular packing density and temperature on the reaction.

Main Methods:

  • Ambient scanning tunneling microscopy (STM) was employed to visualize the molecular arrangement and reaction.
  • Coadsorption of trimesic acid and undecan-1-ol or decan-1-ol on highly oriented pyrolytic graphite (HOPG) (0001) substrate.
  • Controlled variation of adsorbate concentration and deposition temperature to study reaction thresholds.

Main Results:

  • Esterification was observed to occur directly at the liquid-solid interface.
  • The reaction was initiated upon reaching specific thresholds in adsorbate packing density or deposition temperature.
  • Packing density was tunable via trimesic acid concentration, sonication, or stirring.

Conclusions:

  • Catalyst-free esterification is feasible within ordered molecular monolayers at the liquid-solid interface.
  • Molecular packing density and deposition temperature are critical factors controlling interfacial reactions.
  • This work provides insights into interfacial reaction mechanisms and monolayer self-assembly.