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<p>Two new Ag(I) complexes, [Ag<sub>3</sub>(Me-bba)<sub>3</sub>(trimesate)]·3C<sub>2</sub>H<sub>5</sub>OH (<b>1</b>) [Ag<sub>2</sub>(Me-bba)<sub>2</sub>(terephthalate)]·2H<sub>2</sub>O (<b>2</b>) (Me-bba = 1,3-bis[(<i>N</i>-methylbenzimidazole)methylene]-2-aniline), were synthesized and characterized. Structural analysis shows that the two complexes are trinuclear fan-shaped and binuclear centrosymmetric structures, respectively. The electrochemical sensing properties of two composite electrodes (CE-1 and CE-2) prepared from two multinuclear Ag(I) complexes were investigated using chronoamperometry (CA) in 0.2&#xa0;M PBS (pH = 6) for hydrogen peroxide. The results manifest that the two composite electrodes (CE-1 and CE-2) exhibit good linear responses to hydrogen peroxide in the concentration ranges of 0.5 µM ~ 50 µM and 0.1 mM ~ 4 mM. The CE-1 and CE-2 show high sensitivities of 188.11 and 4.07 µA·mM⁻¹·cm⁻², and low detection limits (S/<i>N</i> = 3) of 0.21 and 0.38 µM, respectively. The sensing performance of CE-1 is better than that of CE-2, because there are more active centers and greater deformability of Ag(I) in complex <b>1</b>. Moreover, the two sensors have excellent stability, selectivity, fast response time (≤ 3&#xa0;s), and the recoveries of CE-1 in the actual sample detection are 98.6% to 104.0%.</p> Graphical abstract <p></p> <p>Two new Ag(I) complexes were synthesized and characterized. The electrochemical sensing properties of two composite electrodes (CE-1 and CE-2) prepared from two multinuclear Ag(I) complexes were investigated using chronoamperometry (CA) in 0.2&#xa0;M PBS (pH = 6) for hydrogen peroxide. The two composite electrodes demonstrated excellent electrochemical sensing of performance for H<sub>2</sub>O<sub>2</sub> with the high sensitivity of 188.11 (CE-1) and 4.07 (CE-2) µA·mM<sup>− 1</sup>·cm<sup>− 2</sup>. Moreover, the two sensors have excellent stability, selectivity, fast response time (≤ 3&#xa0;s), and the recoveries of CE-1 in the actual sample detection are 98.6% to 104.0%.</p>

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Electrochemical sensing of hydrogen peroxide at multinuclear Ag(I) complex electrodes doped with carbon paste based on nitrogen heterocyclic ligand

  • 期刊论文

  • 发表日期：

    2025年11月10日

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  • Quanlong Cai,
  • Rongrong Gao,
  • Yuanyue Ma,
  • Junjie Teng,
  • Huilu Wu

摘要

Two new Ag(I) complexes, [Ag3(Me-bba)3(trimesate)]·3C2H5OH (1) [Ag2(Me-bba)2(terephthalate)]·2H2O (2) (Me-bba = 1,3-bis[(N-methylbenzimidazole)methylene]-2-aniline), were synthesized and characterized. Structural analysis shows that the two complexes are trinuclear fan-shaped and binuclear centrosymmetric structures, respectively. The electrochemical sensing properties of two composite electrodes (CE-1 and CE-2) prepared from two multinuclear Ag(I) complexes were investigated using chronoamperometry (CA) in 0.2 M PBS (pH = 6) for hydrogen peroxide. The results manifest that the two composite electrodes (CE-1 and CE-2) exhibit good linear responses to hydrogen peroxide in the concentration ranges of 0.5 µM ~ 50 µM and 0.1 mM ~ 4 mM. The CE-1 and CE-2 show high sensitivities of 188.11 and 4.07 µA·mM⁻¹·cm⁻², and low detection limits (S/N = 3) of 0.21 and 0.38 µM, respectively. The sensing performance of CE-1 is better than that of CE-2, because there are more active centers and greater deformability of Ag(I) in complex 1. Moreover, the two sensors have excellent stability, selectivity, fast response time (≤ 3 s), and the recoveries of CE-1 in the actual sample detection are 98.6% to 104.0%.

Graphical abstract

Two new Ag(I) complexes were synthesized and characterized. The electrochemical sensing properties of two composite electrodes (CE-1 and CE-2) prepared from two multinuclear Ag(I) complexes were investigated using chronoamperometry (CA) in 0.2 M PBS (pH = 6) for hydrogen peroxide. The two composite electrodes demonstrated excellent electrochemical sensing of performance for H2O2 with the high sensitivity of 188.11 (CE-1) and 4.07 (CE-2) µA·mM− 1·cm− 2. Moreover, the two sensors have excellent stability, selectivity, fast response time (≤ 3 s), and the recoveries of CE-1 in the actual sample detection are 98.6% to 104.0%.