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Different notations are used to represent the three-dimensional structure of molecules on two-dimensional surfaces. One of the most commonly used representations is the dash-wedge formula. The dashed wedges, solid wedges, and the plane lines indicate the groups situated behind the plane, coming out of the plane, and in the plane, respectively.
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Hydrogen-bonded rosettes comprising π-conjugated systems as building blocks for functional one-dimensional

Bimalendu Adhikari1, Xu Lin, Mitsuaki Yamauchi

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Hydrogen-bonded supermacrocycles, or rosettes, enable the creation of functional columnar nanoassemblies from π-conjugated molecules. These rosettes offer enhanced stability and unique properties for advanced materials and devices.

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Area of Science:

  • Supramolecular chemistry
  • Materials science
  • Organic electronics

Background:

  • Hydrogen-bonded supermacrocycles (rosettes) are disk-shaped synthons for columnar nanoassemblies.
  • They can act as monomer units for supramolecular polymers and components in soft matter.
  • This review explores their advantages over expanded π-conjugated covalent molecules.

Purpose of the Study:

  • To review the self-assembly of π-conjugated molecules into rosettes.
  • To illustrate the merits of using rosette motifs for creating functional columnar nanoassemblies.
  • To highlight unique properties and applications of rosette-based systems.

Main Methods:

  • Self-assembly of photochemically and electrochemically active π-conjugated molecules.
  • Formation of supramolecular rosettes via complementary hydrogen bonding.
  • Characterization of rosette structures, properties, and functionalities.

Main Results:

  • Rosettes provide access to well-defined, expanded π-surfaces with higher association constants.
  • Columnar nanoassemblies exhibit unique self-assembly, chiroptical, photophysical, and electrochemical properties.
  • Stimuli responsiveness of building blocks is amplified in rosette-organized structures.

Conclusions:

  • Supramolecular rosettes are advantageous for creating stable, functional columnar nanoassemblies.
  • These assemblies possess unique nanoscale and bulk properties.
  • Rosette motifs show promise in supramolecular polymers, photovoltaic devices, and other applications.