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  • 1SKLSCUSS, BNLMS, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.

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Researchers achieved extended molecular fractals, specifically Sierpiński triangles, using self-assembling aromatic bromo compounds. This breakthrough enables the creation of complex fractal patterns at the molecular level through controlled bonding.

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Area of Science:

  • Supramolecular Chemistry
  • Surface Science
  • Materials Science

Background:

  • Fractals are complex patterns exhibiting self-similarity across different scales.
  • Extended molecular fractals, formed by self-assembly, have been a long-standing pursuit in chemistry and materials science.
  • Previous attempts to create molecular fractals have not been successful.

Purpose of the Study:

  • To design and synthesize novel building blocks for constructing extended molecular fractals.
  • To achieve the formation of defect-free molecular fractals using self-assembly.
  • To explore the fundamental principles governing the creation of molecular fractals at surfaces.

Main Methods:

  • Design and synthesis of two aromatic bromo compounds: 4,4″-dibromo-1,1':3',1″-terphenyl and 4,4‴-dibromo-1,1':3',1″:4″,1‴-quaterphenyl.
  • Utilizing synergistic halogen and hydrogen bonds for molecular self-assembly.
  • Experimental investigation on a Ag(111) surface at temperatures below 80 K.

Main Results:

  • Successful formation of defect-free molecular fractals, specifically Sierpiński triangles.
  • Demonstration of synergistic halogen and hydrogen bonding as the driving force for self-assembly.
  • Identification of critical parameters influencing the preparation of molecular Sierpiński triangles.

Conclusions:

  • A new strategy for preparing extended molecular fractals has been established.
  • The developed method allows for the controlled formation of Sierpiński triangles at surfaces.
  • This approach holds potential for the synthesis and exploration of diverse planar molecular fractals.