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Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons
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4-Aminothiophenol Photodimerization Without Plasmons.

Ivano Alessandri1,2,3

  • 1Sustainable Chemistry and Materials Group, Department of Information Engineering, University of Brescia, Italy.

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|May 9, 2022
PubMed
Summary

The photodimerization of 4-aminothiophenol (PATP) to 4,4'-dimercaptobenzene (DMAB) occurs without plasmonic nanoparticles. This light-driven reaction is activated by laser-induced singlet oxygen, offering new insights into redox processes.

Keywords:
DMABPATPPhotodimerizationSinglet OxygenSurface-Enhanced Raman Spectroscopy

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Area of Science:

  • Photochemistry
  • Surface Science
  • Nanomaterials

Background:

  • The photodimerization of 4-aminothiophenol (PATP) to 4,4 '-dimercaptobenzene (DMAB) is a model reaction for studying plasmon-enhanced photocatalysis.
  • Previous studies have focused on plasmonic nanoparticles to mediate this light-driven process.

Purpose of the Study:

  • To investigate the PATP-to-DMAB photoreaction in the absence of plasmonic mediators.
  • To explore alternative mechanisms for light-driven chemical transformations.

Main Methods:

  • Confocal microRaman spectroscopy was used to monitor the reaction progress.
  • Experiments were conducted with PATP adsorbed on non-plasmonic nanoparticles (TiO2, ZnO, SiO2) and as macroscopic droplets.
  • Reactions were studied under both aerobic and anaerobic conditions.

Main Results:

  • The PATP-to-DMAB photoreaction was observed for the first time without plasmonic mediators.
  • Reaction kinetics varied depending on the substrate (non-plasmonic nanoparticles or droplets).
  • Evidence suggests direct laser-induced activation of singlet oxygen species drives the reaction.

Conclusions:

  • The study demonstrates a plasmon-free pathway for PATP photodimerization.
  • Laser-induced singlet oxygen is proposed as the key reactive species.
  • Findings elucidate the influence of sample morphology, light, and oxygen on light-driven redox processes.