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Anion-π and cation-π interactions on the same surface.

Kaori Fujisawa1, César Beuchat, Marie Humbert-Droz

  • 1School of Chemistry and Biochemistry, University of Geneva, Geneva (Switzerland) http://www.unige.ch/sciences/chiorg/matile/

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Summary

This study explores simultaneous anion-π and cation-π interactions on aromatic surfaces using push-pull chromophores. Results show these "ion pair-π" interactions significantly influence electronic properties, exceeding solvent effects.

Keywords:
computational chemistrypeptidespush-pull chromophoresspectral tuningπ interactions

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Area of Science:

  • Supramolecular Chemistry
  • Photophysics
  • Organic Electronics

Background:

  • Aromatic systems are known to engage in anion-π and cation-π interactions independently.
  • Understanding simultaneous interactions is crucial for designing advanced functional materials.
  • Push-pull chromophores offer a unique platform due to their inherent dipole moments.

Purpose of the Study:

  • To investigate the simultaneous occurrence of anion-π and cation-π interactions on the same aromatic surface.
  • To explore push-pull chromophores as platforms for "ion pair-π" interactions.
  • To quantify the influence of these interactions on photophysical properties.

Main Methods:

  • Synthesis of 4-amino-1,8-naphthalimides functionalized with carboxylate-guanidinium pairs.
  • Spectroscopic analysis (UV-Vis absorption and emission) in various solvents.
  • Theoretical calculations (DFT) to model ground and excited states.

Main Results:

  • Observation of a significant bathochromic shift (red shift) in antiparallel ion pair-π orientation.
  • Experimental red shift of 41 nm in non-polar solvent, aligning with theoretical predictions of 70 nm.
  • Intramolecular Stark effect from antiparallel interactions dominates over solvatochromic effects.
  • Theoretical evidence for interactions with π-acidic (naphthalenediimides) and π-basic (pyrenes) surfaces.

Conclusions:

  • Push-pull chromophores are effective platforms for simultaneous anion-π and cation-π interactions.
  • Antiparallel ion pair-π interactions induce substantial electronic changes, particularly a bathochromic shift.
  • These interactions offer a powerful tool for tuning chromophore properties, with potential applications in molecular electronics and sensing.