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

IF 2.8 4区化学 Q3 CHEMISTRY, INORGANIC & NUCLEAR

Transition Metal Chemistry Pub Date : 2025-11-10 DOI:10.1007/s11243-025-00696-w

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

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Abstract

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%.

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过氧化氢在掺杂氮杂环配体碳糊的多核Ag(I)配合物电极上的电化学传感

合成了两个新的Ag(I)配合物[Ag3(Me-bba)3（三聚己酸酯）]·3C2H5OH (1) [Ag2(Me-bba)2（对苯二甲酸酯）]·2H2O (2) （Me-bba = 1,3-二[（n -甲基苯并咪唑）亚甲基]-2-苯胺）并进行了表征。结构分析表明，这两种配合物分别为三核扇形和双核中心对称结构。在0.2 M PBS （pH = 6）溶液中，用计时电流法（CA）研究了两种多核Ag(I)配合物制备的复合电极CE-1和CE-2的电化学传感性能。结果表明：复合电极CE-1和CE-2在0.5µM ~ 50µM和0.1 mM ~ 4 mM的浓度范围内对过氧化氢具有良好的线性反应，CE-1和CE-2的灵敏度分别为188.11和4.07µA·mM⁻¹·cm⁻²，检出限（S/N = 3）分别为0.21和0.38µM。CE-1的传感性能优于CE-2，这是由于配合物1中Ag(I)有更多的活性中心和更大的变形能力。两种传感器具有优良的稳定性、选择性、快速响应时间（≤3 s），实际样品检测中CE-1的回收率为98.6% ~ 104.0%。摘要合成了两个新的Ag(I)配合物并进行了表征。在0.2 M PBS （pH = 6）溶液中，用计时电流法（CA）研究了两种多核Ag(I)配合物制备的复合电极CE-1和CE-2的电化学传感性能。两种复合电极对H2O2具有良好的电化学传感性能，灵敏度分别为188.11 （CE-1）和4.07 （CE-2）µA·mM−1·cm−2。两种传感器具有优良的稳定性、选择性、快速响应时间（≤3 s），实际样品检测中CE-1的回收率为98.6% ~ 104.0%。

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来源期刊

Transition Metal Chemistry 化学-无机化学与核化学

CiteScore

3.60

自引率

0.00%

发文量

审稿时长

1.3 months

期刊介绍： Transition Metal Chemistry is an international journal designed to deal with all aspects of the subject embodied in the title: the preparation of transition metal-based molecular compounds of all kinds (including complexes of the Group 12 elements), their structural, physical, kinetic, catalytic and biological properties, their use in chemical synthesis as well as their application in the widest context, their role in naturally occurring systems etc. Manuscripts submitted to the journal should be of broad appeal to the readership and for this reason, papers which are confined to more specialised studies such as the measurement of solution phase equilibria or thermal decomposition studies, or papers which include extensive material on f-block elements, or papers dealing with non-molecular materials, will not normally be considered for publication. Work describing new ligands or coordination geometries must provide sufficient evidence for the confident assignment of structural formulae; this will usually take the form of one or more X-ray crystal structures.