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Related Concept Videos

Anoxygenic Photosynthesis01:30

Anoxygenic Photosynthesis

Anoxygenic photosynthesis is a phototrophic process that captures light energy to drive carbon fixation without producing molecular oxygen. Unlike oxygenic photosynthesis, which utilizes water as an electron donor and releases oxygen, anoxygenic phototrophs use alternative electron donors such as hydrogen sulfide (H₂S), elemental sulfur (S⁰), or thiosulfate (S₂O₃²⁻). This process is carried out by diverse groups of bacteria, including purple bacteria, green sulfur bacteria, heliobacteria, and...
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Reaction centers are pigment-protein complexes that initiate energy conversion from photons to chemical entities. Therefore, photochemical reaction center is a more appropriate term that describes these complexes. The Nobel laureates Robert Emerson and William Arnold provided the first experimental evidence of photochemical reaction centers by demonstrating the participation of nearly 2,500 chlorophyll molecules for the release of just one molecule of oxygen. Despite thousands of photosynthetic...
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Updated: Jul 14, 2026

Developing Photosensitizer-Cobaloxime Hybrids for Solar-Driven H2 Production in Aqueous Aerobic Conditions
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Published on: October 5, 2019

Blue-Light-Driven Aerobic Oxidation via ROS-Generating Binuclear Cobalt(II) Complex Photocatalyst.

Yuhao Mu1, Zhuang Miao1, Rong Zhang1

  • 1College of Engineering, Xi'an International University, Xi'an 710077, China.

Nanomaterials (Basel, Switzerland)
|July 13, 2026
PubMed
Summary

A novel binuclear cobalt complex (Co2) acts as an earth-abundant photocatalyst for visible-light-driven aerobic oxidation. This catalyst efficiently converts thioethers to sulfoxides with high selectivity and stability.

Keywords:
aerobic oxidationbinuclear complexblue lightphotocatalysissuperoxide radical

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Area of Science:

  • Photocatalysis
  • Sustainable Chemistry
  • Organometallic Chemistry

Background:

  • Developing earth-abundant photocatalysts for visible-light-driven aerobic oxidation is crucial for sustainable chemistry.
  • Integrating light-harvesting and catalytic functions in a single molecular unit presents a significant challenge.

Purpose of the Study:

  • To synthesize and characterize a binuclear cobalt(II) complex (Co2) for visible-light-driven aerobic oxidation.
  • To investigate the photocatalytic mechanism and efficiency of the Co2 complex.

Main Methods:

  • Synthesis of a binuclear cobalt(II) complex with a polypyridine scaffold.
  • Photophysical characterization including absorption spectroscopy and photoexcitation studies.
  • Mechanistic studies involving spectroscopic analysis and reaction monitoring of thioether oxidation.

Main Results:

  • The Co2 complex exhibits strong absorption below 450 nm and efficient charge separation upon photoexcitation.
  • Under blue-light irradiation, the complex facilitates the single-electron reduction of molecular oxygen (O2) to superoxide radical anion (O2•-).
  • Co2 selectively oxidizes thioethers to sulfoxides with >95% yield, avoiding over-oxidation to sulfones, and demonstrates high stability over multiple catalytic cycles.

Conclusions:

  • The polypyridine scaffold and proximal cobalt sites in Co2 work synergistically to achieve efficient photocatalysis.
  • This work presents a design strategy for noble-metal-free, visible-light-driven organic transformations using discrete bimetallic photocatalysts.