Two electrochemical sensors based on different skeleton silver(I) complex modified glassy carbon electrodes for determination of H2O2

IF 2.8 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Polyhedron Pub Date : 2026-02-01 Epub Date: 2025-12-01 DOI:10.1016/j.poly.2025.117918

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

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Abstract

Two new silver(I) complexes, {[Ag₂(S-3Py)₂(fumarate)]·2C₂H₅OH·2H₂O}_n (1) and [Ag₂(S-4Py)₂(fumarate)]·3C₂H₅OH (2), (S-3Py = bis[1-(pyridin-3-ylmethyl)-benzimidazol-2-ylmethyl]sulfane, S-4Py = bis[1-(pyridin-4-ylmethyl)-benzimidazol-2-ylmethyl]sulfane), were synthesized. Single-crystal structural analysis revealed that Complex 1 adopts a one-dimensional chain structure, while Complex 2 exhibits a discrete binuclear configuration. The difference of skeleton structure of silver(I) complexes is due to the steric hindrance of main ligands S-3Py and S-4Py. The electrochemical sensing performance of two silver(I) complexes modified glassy carbon electrodes (Ag-1@GCE and Ag-2@GCE) for hydrogen peroxide detection in 0.2 M PBS was studied by constant voltage chronoamperometry. The Ag-1@GCE and Ag-2@GCE sensors for H₂O₂ was realized with a good linear response over the concentration range from 0.5 μM to 4 mM, a detection limit of 0.136 μM and 0.214 μM (S/N = 3), high selectivity and short response time (< 3 s). Relative to Ag-2@GCE, Ag-1@GCE has better H₂O₂ recognition activity, which is attributed to the extensible one-dimensional structure and more electrocatalytic active sites of complex 1. Moreover, the two electrodes demonstrate high accuracy, with a recovery rate of 96.5 % -103.3 % for H₂O₂ detection. This paper provides a new method for the development of metal complex electrochemical sensors.

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两种基于不同骨架银(I)配合物修饰玻碳电极的电化学传感器测定H2O2

合成了两个新的银(I)配合物{[Ag2(S-3Py)2（富马酸酯）]·2C2H5OH·2H2O}n(1)和[Ag2(S-4Py)2（富马酸酯）]·3C2H5OH (2), (S-3Py =双[1-（吡啶-3-甲基）-苯并咪唑-2-基甲基]磺胺，S-4Py =双[1-（吡啶-4-甲基）-苯并咪唑-2-基甲基]磺胺。单晶结构分析表明，配合物1为一维链结构，配合物2为离散双核构型。银(I)配合物骨架结构的差异是由于主配体S-3Py和S-4Py的位阻作用所致。采用恒压计时电流法研究了两种银(I)配合物修饰的玻碳电极（Ag-1@GCE和Ag-2@GCE）在0.2 M PBS中检测过氧化氢的电化学传感性能。该传感器在0.5 μM ~ 4 mM范围内具有良好的线性响应，检测限分别为0.136 μM和0.214 μM (S/N = 3)，选择性高，响应时间短（< 3 S）。相对于Ag-2@GCE， Ag-1@GCE具有更好的H2O2识别活性，这归功于配合物1具有可扩展的一维结构和更多的电催化活性位点。此外，两电极对H2O2的检测精度较高，回收率为96.5% ~ 103.3%。本文为金属络合电化学传感器的研制提供了一种新的途径。

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来源期刊

Polyhedron 化学-晶体学

CiteScore

4.90

自引率

7.70%

发文量

515

审稿时长

2 months

期刊介绍： Polyhedron publishes original, fundamental, experimental and theoretical work of the highest quality in all the major areas of inorganic chemistry. This includes synthetic chemistry, coordination chemistry, organometallic chemistry, bioinorganic chemistry, and solid-state and materials chemistry. Papers should be significant pieces of work, and all new compounds must be appropriately characterized. The inclusion of single-crystal X-ray structural data is strongly encouraged, but papers reporting only the X-ray structure determination of a single compound will usually not be considered. Papers on solid-state or materials chemistry will be expected to have a significant molecular chemistry component (such as the synthesis and characterization of the molecular precursors and/or a systematic study of the use of different precursors or reaction conditions) or demonstrate a cutting-edge application (for example inorganic materials for energy applications). Papers dealing only with stability constants are not considered.