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Self-assembly of a catechol-based macrocycle at the liquid-solid interface: experiments and molecular dynamics

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Solvent molecules and surface interactions influence macrocycle self-assembly. Co-adsorption with solvent stabilizes open patterns by desorbing lateral chains at the liquid-solid interface.

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Area of Science:

  • Surface Science
  • Supramolecular Chemistry
  • Computational Chemistry

Background:

  • Schiff-base macrocycles are versatile building blocks for self-assembly.
  • Understanding liquid-solid interfaces is crucial for molecular organization.
  • Solvent effects significantly impact self-assembly processes.

Purpose of the Study:

  • To investigate the 2-D self-assembly of a Schiff-base macrocycle at the liquid-solid interface.
  • To elucidate the roles of solvent effects and surface interactions in directing self-assembly.
  • To explore the relationship between molecular structure and emergent supramolecular patterns.

Main Methods:

  • Scanning Tunneling Microscopy (STM) for high-resolution surface imaging.
  • X-ray Photoelectron Spectroscopy (XPS) for surface chemical analysis.
  • Molecular Dynamics (MD) simulations for investigating interfacial phenomena and solvent behavior.

Main Results:

  • STM revealed a hexagonal ordering of macrocycles at the n-tetradecane/Au(111) interface.
  • Macrocycles adopted a unidirectional orientation, preventing close-packing.
  • XPS confirmed strong macrocycle-surface interactions.
  • MD simulations showed solvent co-adsorption inducing lateral chain desorption and stabilizing open assembly.

Conclusions:

  • Solvent molecules play a critical role as spacers, stabilizing open self-assembly patterns.
  • The interplay between solvent effects and strong surface interactions dictates the observed macrocycle arrangement.
  • The study provides insights into controlling molecular self-assembly at interfaces through solvent engineering.