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Solvent controlled self-assembly at the liquid-solid interface revealed by STM.

Wael Mamdouh1, Hiroshi Uji-i, Janine S Ladislaw

  • 1Department of Chemistry, Division of Molecular and Nano Materials, Laboratory of Photochemistry and Spectroscopy, Katholieke Universiteit Leuven, Celestijnenlaan 200-F, 3001 Leuven, Belgium.

Journal of the American Chemical Society
|January 5, 2006
PubMed
Summary
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Solvent choice dramatically alters 2D supramolecular ordering at liquid-solid interfaces. Hydrophobic solvents enable coadsorption, influencing molecular network patterns based on alkyl chain length.

Area of Science:

  • Supramolecular Chemistry
  • Surface Science
  • Materials Science

Background:

  • Understanding molecular self-assembly at interfaces is crucial for designing advanced materials.
  • The role of solvents in directing supramolecular ordering is complex and requires detailed investigation.

Purpose of the Study:

  • To investigate the effect of various solvents on the two-dimensional (2D) supramolecular ordering of monodendron 1 at a liquid-solid interface.
  • To elucidate the influence of solvent properties (hydrophilic vs. hydrophobic) and alkyl chain length on molecular assembly.

Main Methods:

  • Scanning Tunneling Microscopy (STM) was employed to visualize and analyze the 2D supramolecular structures at the liquid-solid interface.
  • A systematic variation of solvents, including hydrophilic (alcohols, acids) and hydrophobic (aromatics, alkanes) types, was performed.

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Main Results:

  • Significant differences in 2D supramolecular ordering were observed, strongly dependent on the solvent's nature.
  • Hydrophobic solvents (hydrocarbons) led to coadsorption of solvent molecules within the 2D molecular network, unlike hydrophilic solvents.
  • In coadsorbing systems, the alkyl chain length of the solvent molecules markedly influenced the resulting 2D patterns.

Conclusions:

  • Solvent properties critically dictate the 2D supramolecular organization and the potential for solvent coadsorption.
  • Molecule-molecule (homo and hetero) and molecule-substrate interactions are key factors governing the observed solvent and alkyl chain length effects.