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Competitive Charge Separation Pathways in a Flexible Molecular Folda-Dimer.

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Molecular folda-dimers with flexible N,N-diethylaniline linkers exhibit distinct photophysical behaviors. The folded conformation promotes symmetry-breaking charge separation, while the open form shows bridge-mediated electron transfer.

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Area of Science:

  • Photochemistry
  • Supramolecular Chemistry
  • Materials Science

Background:

  • Molecular folda-dimers offer tunable photophysical properties.
  • Controlling conformation is key to directing charge separation pathways.

Purpose of the Study:

  • Investigate the photophysical properties of a PDI-AnEt2-PDI folda-dimer.
  • Characterize charge separation dynamics in different conformations and solvent polarities.

Main Methods:

  • Synthesis of the PDI-AnEt2-PDI molecular folda-dimer.
  • Spectroscopic characterization of photophysical properties.
  • Analysis of photoinduced charge separation dynamics in various solvents.

Main Results:

  • The folda-dimer exists in open and folded conformations based on solvent polarity.
  • The open form undergoes bridge electron transfer, independent of solvent polarity.
  • The folded form exhibits symmetry-breaking charge separation (SBCS) between PDI units.
  • Excimer formation observed in the open form, but not in the folded form.

Conclusions:

  • Conformational flexibility significantly influences photophysical pathways in folda-dimers.
  • The folded conformation preferentially leads to SBCS.
  • Design principles for folda-dimers can be established to tune photophysical outcomes.