Selectively Lighting Up Singlet Oxygen via Aggregation-Induced Electrochemiluminescence Energy Transfer

Area of Science:

• Nanomaterials Chemistry
• Photochemistry
• Analytical Chemistry

Background:

• Singlet oxygen (¹O₂) is a crucial reactive oxygen species (ROS) in photochemical and photobiological processes.
• Controlling and detecting ¹O₂ is vital for understanding these natural phenomena.

Purpose of the Study:

• To develop a method for selectively generating and detecting emissive singlet oxygen (¹O₂).
• To utilize aggregation-induced emission (AIE) electrochemiluminescence (ECL) from gold nanoclusters (AuNCs) for this purpose.

Main Methods:

• Fabrication of Zn²⁺-mediated AIE-assembled gold nanoclusters (Zn²⁺-AIE-AuNCs).
• Electrochemical oxidation of Zn²⁺-AIE-AuNCs in the presence of tripropylamine (TEA) and carbonate buffer.
• Analysis of emission spectra to identify the emitter species (¹O₂ or AuNCs).

Main Results:

• The Zn²⁺-AIE-AuNCs/TEA system in carbonate buffer selectively generated emissive ¹O₂ around 703 nm via an energy transfer route.
• In the absence of carbonate buffer or TEA, or under photoexcitation, ¹O₂ generation was either non-emissive or the emitter was the AuNCs themselves (around 485 nm).
• This indicates a selective pathway for generating emissive ¹O₂ through electrochemical oxidation.

Conclusions:

• A novel strategy was established for achieving aggregation-induced emission (AIE) with singlet oxygen (¹O₂) as the emitter.
• This work provides a promising approach for the selective detection and visualization of ¹O₂.