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Related Concept Videos

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TiO2 Nanoparticles Enabling Photocatalytic Desulfurization for C-C Coupling Reaction Using Visible Light.

Shea Stewart1, Matas Simukaitis1, H Christopher Fry2

  • 1Department of Chemistry, Temple University, 1901 North 13th Street, Philadelphia, Pennsylvania 19122, United States.

ACS Nanoscience Au
|June 22, 2026
PubMed
Summary
This summary is machine-generated.

This study reveals a new visible-light photocatalysis mechanism using titanium dioxide (TiO2) nanoparticles. A surface thiol-Ti complex absorbs visible light, enabling efficient thiol desulfurization and C-S bond cleavage.

Keywords:
addition of carbon radical to vinyl groupsheterogeneous photocatalysisphotocatalytic thiol desulfurizationreactive carbon radicalssurface complex absorbing visible light

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Area of Science:

  • Photocatalysis
  • Materials Science
  • Organic Chemistry

Background:

  • Titanium dioxide (TiO2) is a UV-active photocatalyst.
  • Visible-light photocatalysis is desirable for sustainable chemical reactions.
  • Thiol desulfurization is an important chemical transformation.

Purpose of the Study:

  • To elucidate the mechanism of visible-light-driven photocatalytic desulfurization of thiols on TiO2 nanoparticles.
  • To identify the role of surface complexes in visible-light absorption and activation.
  • To provide a framework for extending visible-light reactivity to wide-bandgap metal oxides.

Main Methods:

  • Diffuse reflectance infrared spectroscopy
  • Cryogenic electron paramagnetic resonance spectroscopy
  • LED illumination (>420 nm)

Main Results:

  • Formation of a surface thiol-Ti charge-transfer complex was verified.
  • This complex introduces visible-light absorption to the TiO2 system.
  • Selective photoexcitation of the complex drives C-S bond scission without band gap excitation.
  • Carbon-centered radicals were formed and coupled with styrene.

Conclusions:

  • A surface-mediated mechanism for visible-light photocatalysis was uncovered.
  • Charge-transfer complex formation dictates light absorption and chemical activation.
  • This mechanism offers a pathway for visible-light utilization in TiO2 photocatalysis.