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Electrochemical Systems01:24

Electrochemical Systems

143
Electrochemical systems provide a fascinating insight into the dynamic interplay of charged species within various phases. One notable example is the interaction between a membrane permeable to K⁺ ions but not to Cl⁻ ions, separating an aqueous KCl solution from pure water. As K⁺ ions diffuse through the membrane, they generate net charges on each phase, leading to a potential difference between them.Similarly, when a piece of Zn is immersed in an aqueous ZnSO₄ solution,...
143

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Enzyme-activatable charge transfer in gold nanoclusters.

Hao-Hua Deng1, Kai-Yuan Huang1, Yu Zhong1

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Researchers engineered luminescent gold nanoclusters (AuNCs) using 6-mercaptopurine ribonucleoside (MPR) ligands. These AuNCs enable enzyme-activatable charge transfer (CT) for sensing purine nucleoside phosphorylase (PNP) activity.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Biochemistry

Background:

  • Surface ligands critically influence metal nanocluster (MNC) properties and applications.
  • Ligand engineering offers a versatile strategy to tailor MNC characteristics.

Purpose of the Study:

  • To design water-soluble luminescent gold nanoclusters (AuNCs) with enzyme-activatable charge transfer (CT) capabilities.
  • To explore the use of 6-mercaptopurine ribonucleoside (MPR) for ligand engineering of AuNCs.
  • To develop AuNCs for sensing purine nucleoside phosphorylase (PNP) activity.

Main Methods:

  • Synthesis of AuNCs using MPR as a surface ligand.
  • Characterization of AuNC photophysical properties, including phosphorescence and CT state.
  • Investigation of enzyme-triggered luminescence changes upon PNP cleavage.

Main Results:

  • A novel Au5(MPR)2 nanocluster exhibiting stable intramolecular CT and color-tunable phosphorescence was synthesized.
  • Enzymatic cleavage by PNP induced a bathochromic shift and altered luminescence properties.
  • The engineered AuNCs demonstrated high affinity for PNP and potential for enzyme activity analysis.

Conclusions:

  • Rational ligand engineering of MNCs can diversify their physicochemical properties and applications.
  • MPR-functionalized AuNCs provide a sensitive platform for enzyme detection and drug screening.
  • This approach facilitates the development of precisely engineered solution-based nanocluster materials.