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Researchers modulated excimer emission in π-conjugated systems by altering side chains on bisphenalenyl derivatives. This study provides a framework for designing responsive fluorescent materials through structure and environment control.

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Area of Science:

  • Materials Science
  • Photochemistry
  • Organic Chemistry

Background:

  • Dynamic excimer formation in π-conjugated systems offers tunable photophysical properties.
  • Precise control over transient excimer species in solution remains a challenge.

Purpose of the Study:

  • To investigate the influence of side-chain engineering on excimer formation in bisphenalenyl derivatives.
  • To establish a structure-environment framework for controlling dynamic excimer formation and designing responsive fluorescent materials.

Main Methods:

  • Synthesis of bisphenalenyl derivatives with varying side chains (ethylphenyl, n-butylphenyl, n-hexyl).
  • Steady-state and time-resolved spectroscopy.
  • Time-dependent density functional theory (TD-DFT) calculations.
  • Diffusion-ordered NMR spectroscopy (DOSY).

Main Results:

  • Phenyl-substituted bisphenalenyls showed reversible, concentration-dependent excimer emission attributed to excited-state dimerization.
  • Aliphatically substituted derivatives exhibited only monomeric emission.
  • Excimer formation was confirmed to arise from excited-state encounters in acetonitrile, with no ground-state aggregation.
  • DOSY revealed dimer formation in tetrachloroethane.
  • Substoichiometric addition of HBF4 induced excimer emission at lower concentrations, demonstrating stimulus-responsive control.

Conclusions:

  • Side-chain structure and solvent environment significantly modulate dynamic excimer formation in bisphenalenyl systems.
  • Excited-state dimerization is the primary mechanism for excimer formation in these derivatives.
  • The findings provide a rational design strategy for responsive fluorescent materials based on charged π-systems.