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Coverage dependent supramolecular structures: C60:ACA monolayers on Ag(111).

Bo Xu1, Chenggang Tao, Ellen D Williams

  • 1Department of Chemistry and Biochemistry, University of Maryland, College Park, MD 20742, USA.

Journal of the American Chemical Society
|June 29, 2006
PubMed
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The study reveals how acridine-9-carboxylic acid (ACA) forms distinct structures, from 2-D gas to ordered chains and dimers, influencing C(60) assembly. These findings map supramolecular assembly based on molecular coverage.

Area of Science:

  • Supramolecular chemistry
  • Surface science
  • Materials science

Background:

  • Understanding molecular self-assembly is crucial for designing advanced materials.
  • Fractional molecular coverage significantly impacts the resulting supramolecular structures.
  • Acridine-9-carboxylic acid (ACA) and C(60) fullerene are model systems for studying intermolecular interactions.

Purpose of the Study:

  • To investigate the dependence of supramolecular structure on fractional molecular coverage for ACA and the C(60):ACA binary system.
  • To determine the coverage-dependent phase diagram of ACA.
  • To elucidate the formation mechanisms of C(60):ACA supramolecular structures.

Main Methods:

  • Room-temperature scanning tunneling microscopy (STM) imaging was employed.

Related Experiment Videos

  • Fractional molecular coverage was systematically varied.
  • Molecular packing models were developed based on STM observations.

    • Main Results:

    • ACA exhibits a coverage-dependent phase diagram: 2-D gas (<0.4 ML), chain structures (>0.4 ML), and dimer structures (~1.0 ML).
    • C(60):ACA binary systems form hexagonal cooperative structures or C(60) quasi-chain structures depending on ACA coverage.
    • Enantiopure domains and specific C(60) periodicity were observed in the hexagonal structure.

    Conclusions:

    • The initial phase of ACA critically influences the formation of C(60):ACA supramolecular structures.
    • Chemically intuitive models explain the observed molecular packing.
    • This work provides insights into controlled supramolecular assembly through fractional coverage manipulation.