{Reference Type}: Journal Article
{Title}: 4-Aminothiophenol Photodimerization Without Plasmons.
{Author}: Alessandri I;
{Journal}: Angew Chem Int Ed Engl
{Volume}: 61
{Issue}: 28
{Year}: Jul 2022 11
{Factor}: 16.823
{DOI}: 10.1002/anie.202205013
{Abstract}: The photodimerization of 4-aminothiophenol (PATP) into 4,4'-dimercaptobenzene (DMAB) has been extensively utilized as a paradigm reaction to probe the role of surface plasmons in nanoparticle-mediated light-driven processes. Here I report the first observation of the PATP-to-DMAB photoreaction in the absence of any plasmonic mediators. The reaction was observed to occur with different kinetics either for PATP adsorbed on non-plasmonic nanoparticles (TiO2 , ZnO, SiO2 ) or deposited as macroscopic droplets. Confocal microRaman spectroscopy enabled to investigate the reaction progress in different plasmon-free contexts, either aerobic or anaerobic, suggesting a new interpretation of the photodimerization process, based on direct laser-induced activation of singlet oxygen species. These results provide new insights in light-driven redox processes, elucidating the role of sample morphology, light and oxygen.