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Two-dimensional crystal engineering using halogen and hydrogen bonds: towards structural landscapes.

Arijit Mukherjee1, Joan Teyssandier1, Gunther Hennrich2

  • 1Division of Molecular Imaging and Photonics , Department of Chemistry , KU Leuven-University of Leuven , Celestijnenlaan 200F , B3001 Leuven , Belgium . Email: steven.defeyter@kuleuven.be ;

Chemical Science
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Summary
This summary is machine-generated.

Researchers explored two-dimensional (2D) crystallization by comparing molecular structures and their resulting supramolecular patterns. This work advances predictive models for molecular self-assembly on surfaces.

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Area of Science:

  • Supramolecular chemistry
  • Surface science
  • Materials science

Background:

  • Two-dimensional (2D) crystallization on surfaces is complex, driven by subtle supramolecular and interfacial interactions.
  • Predicting supramolecular structure from molecular structure is challenging, leading to case-by-case studies.
  • Lack of structure-determining relationships hinders understanding across different self-assembling systems.

Purpose of the Study:

  • To establish structure-determining relationships in 2D crystallization.
  • To compare the 2D crystallization of identical building blocks based on a 1,3,5-tris(pyridine-4-ylethynyl)benzene unit.
  • To introduce supramolecular synthons and structural landscapes for surface crystallization analysis.

Main Methods:

  • Utilized scanning tunneling microscopy (STM) for system characterization.
  • Employed minor structural modifications of parent compounds to access novel supramolecular patterns.
  • Investigated 2D co-crystallization with halogen bond donors.

Main Results:

  • Successfully compared 2D crystallization of related molecular building blocks.
  • Demonstrated a chemical perturbation strategy to access diverse supramolecular assemblies.
  • Achieved porous bi-component networks through co-crystallization with halogen bond donors.

Conclusions:

  • The study provides a holistic approach to understanding 2D crystallization.
  • Identified common structural elements using supramolecular synthon and structural landscape concepts.
  • Represents a step towards predictive power in molecular self-assembly on surfaces.