Amino-induced cleavage of the electron-communicating S-bridge to unlock mixed-valence copper for potent oxidase-like catalysis and selective sensing

Abstract

Transition-metal sites with mixed valence often coexist in diverse catalysts, yet their precise roles remain elusive. Taking a thiadiazole-coordinated Cu nanozyme system as an example, we developed ligand side-group engineering to modulate adjacent dicopper sites with different mixed Cu1+/Cu2+ states. Amino functionalization of the ligand induced the cleavage of the electron-communicating S-bridge connecting adjacent copper centers, allowing precise manipulation of the ratio of mixed Cu1+/Cu2+ sites. Such a tailored mixed-valence composition accelerated the preferential and selective activation of O2 to O2˙ through the synergistical mechanism of Cu2+-dominated adsorption of O2 and Cu1+-controlled electron transfer in the initial catalysis step. This targeted pathway boosted the oxidase-mimicking activity of the mixed-valence nanozyme nearly 85-fold compared to its counterpart with adjacent S-bridged Cu centers. The outstanding oxidase-like activity, coupled with the unique affinity of mixed Cu1+/Cu2+ sites for phosphorus, further enabled the highly selective and sensitive sensing of cytotoxic tris(2-carboxyethyl)phosphine with a 0.96-ppm detection limit via a complexation-dominated activity inhibition mechanism. This fundamental insight into the mixed-valence synergy of metal sites provided a new perspective for designing efficient catalysts for various purposes, such as catalysis, sensing and more.

Graphical abstract: Amino-induced cleavage of the electron-communicating S-bridge to unlock mixed-valence copper for potent oxidase-like catalysis and selective sensing

Supplementary files

Article information

Article type
Edge Article
Submitted
15 May 2025
Accepted
04 Jul 2025
First published
05 Jul 2025
This article is Open Access

All publication charges for this article have been paid for by the Royal Society of Chemistry
Creative Commons BY-NC license

Chem. Sci., 2025, Advance Article

Amino-induced cleavage of the electron-communicating S-bridge to unlock mixed-valence copper for potent oxidase-like catalysis and selective sensing

B. Li, N. Xia, C. Huang, X. Hu and F. He, Chem. Sci., 2025, Advance Article , DOI: 10.1039/D5SC03521J

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