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The photochemical behavior of dopamine, a key component of polydopamine, depends on its concentration and pH. Both zwitterionic and protonated/deprotonated forms influence its electronic absorption and fluorescence spectra.

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DLPNO-STEOMTDDFTdopamineexcited state lifetimetime-resolved fluorescence

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Area of Science:

  • Photochemistry
  • Polymer Science
  • Quantum Chemistry

Background:

  • Polydopamine is a widely used polymer with applications in various fields.
  • Understanding the photochemical properties of its building block, dopamine, is crucial for optimizing polydopamine-based materials.

Purpose of the Study:

  • To investigate the electronic absorption and fluorescence emission/excitation spectra of dopamine.
  • To elucidate the photochemical behavior of dopamine under different conditions (concentration and pH).

Main Methods:

  • Experimental techniques: Time-resolved fluorescence spectroscopy.
  • Theoretical methods: First-principles quantum theory, specifically DLPNO-STEOM coupled-cluster theory.
  • Analysis of different dopamine species (standard, zwitterionic, protonated, deprotonated).

Main Results:

  • Dopamine's photochemical behavior is concentration-dependent; the zwitterionic form significantly impacts spectra at high concentrations.
  • Solvent pH is critical: protonated form dominates at pH 5.5, deprotonated form at pH 8.0, affecting absorption and fluorescence.
  • Both radiative and non-radiative deactivation pathways are important for excited electronic states, with a relatively small quantum yield (QY).

Conclusions:

  • The photochemical properties of dopamine are highly sensitive to environmental factors like concentration and pH.
  • Theoretical and experimental findings provide insights into dopamine's excited-state dynamics.
  • This study contributes to a deeper understanding of polydopamine photochemistry.