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Structurally Resolved Water-Soluble Copper Nanoclusters with NIR TADF Exhibiting Multifunctional Catalytic Activity.

Sameeksha Agrawal1, Thrisha Swaminathan1, Sanyam2

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Researchers developed water-soluble copper nanoclusters (CuNCs) exhibiting near-infrared thermally activated delayed fluorescence (NIR-TADF). These multifunctional CuNCs show intense red emission and catalytic activity in aqueous solutions.

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Area of Science:

  • Materials Science
  • Photophysics
  • Nanotechnology

Background:

  • Thermally activated delayed fluorescence (TADF) in metal nanoclusters (MNCs) offers a pathway to utilize triplet state emissions.
  • The widespread application of TADF-active MNCs is hindered by hydrophobic ligands, leading to poor water solubility.
  • Developing water-soluble TADF materials is crucial for diverse applications, especially in aqueous environments.

Purpose of the Study:

  • To synthesize and characterize novel water-soluble copper nanoclusters (CuNCs) with near-infrared (NIR) emitting properties.
  • To investigate and confirm the thermally activated delayed fluorescence (TADF) mechanism in these CuNCs.
  • To explore the multifunctional capabilities of these water-soluble CuNCs, including their catalytic activity.

Main Methods:

  • Synthesis of water-soluble copper nanoclusters (CuNCs).
  • Structural characterization using single-crystal X-ray diffraction (SC-XRD).
  • Photophysical studies including temperature-dependent photoluminescence to validate TADF and estimate the singlet-triplet energy gap (ΔEST).
  • Density Functional Theory (DFT) calculations to elucidate the TADF mechanism and charge-transfer dynamics.
  • Catalytic activity assessment for reduction reactions (ferricyanide, Methylene Blue).

Main Results:

  • Successfully synthesized highly water-soluble CuNCs exhibiting intense red emission in the solid state.
  • Confirmed the TADF mechanism with an experimentally determined ΔEST of ~98 meV.
  • DFT calculations supported the TADF mechanism and revealed charge-transfer characteristics.
  • Demonstrated excellent catalytic activity for reduction of ferricyanide and Methylene Blue in aqueous phase.

Conclusions:

  • The developed water-soluble CuNCs are promising for NIR-TADF applications, overcoming solubility limitations of traditional MNCs.
  • The combination of TADF emission and catalytic activity in an aqueous-compatible format highlights the multifunctional potential of these nanoclusters.
  • These findings pave the way for novel applications in areas requiring water-dispersible luminescent and catalytic nanomaterials.