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Alternately Twisted, Electron-Rich Rylenes and Their Stable Cations.

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Summary
This summary is machine-generated.

Synthesizing long rylene molecules, which typically aggregate, was achieved by introducing backbone twists. This method yields molecules with tunable optical properties and unique electronic behaviors, paving the way for new materials.

Keywords:
Electron‐rich π‐systemsGraphene NanoribbonRadical cationRyleneTwisted molecule

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Area of Science:

  • Organic Chemistry
  • Materials Science
  • Supramolecular Chemistry

Background:

  • Solution-phase synthesis of long rylenes is difficult due to aggregation.
  • Backbone twisting can mitigate aggregation and introduce chirality.

Purpose of the Study:

  • To synthesize novel, long rylene molecules with reduced aggregation.
  • To investigate the impact of backbone twisting and substituents on molecular properties.

Main Methods:

  • Stepwise cross-coupling reactions.
  • Controlled oxidative dehydrogenation.
  • X-ray crystallography, 1H NMR, and ACID analyses.

Main Results:

  • Successfully synthesized rylene molecules up to octarylene with twisted backbones and n-butoxy substituents.
  • Observed alternating P/M helicity in rylenes with multiple tetra(n-butoxy) motifs.
  • Demonstrated length-dependent optical properties (visible to NIR) and facile formation of radical cations/dications.
  • Revealed evolution from local to global aromaticity in dications.

Conclusions:

  • The developed synthetic strategy effectively overcomes aggregation challenges in long rylene synthesis.
  • Twisted rylene structures exhibit unique helical conformations and tunable optoelectronic properties.
  • The electron-rich nature and stability of their oxidized forms are promising for electronic applications.