Glucose electrocatalysts derived from mono- or dicarbene coordinated nickel(II) complexes and their mesoporous carbon composites,Applied Organometallic Chemistry

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Glucose electrocatalysts derived from mono- or dicarbene coordinated nickel(II) complexes and their mesoporous carbon composites
Applied Organometallic Chemistry ( IF 3.7 ) Pub Date : 2021-09-22 , DOI: 10.1002/aoc.6446
Zhoveta Yhobu _{1,

2} , Brinda K. N. ₁ , Gautam Achar ₁ , Jan Grzegorz Małecki ₃ , Rangappa S. Keri ₁ , Nagaraju D. H. ₂ , Srinivasa Budagumpi ₁

Affiliation

Molecular electrocatalysts that contain a metal atom under precise ligand field in a definite geometry feasible for redox reactions has boundless significance in numerous electrocatalytic reactions. Herein, we report nickel-based molecular electrocatalysts anchored on the sterically varied 1,2,4-triazol-5-ylidene ligands. The two metal complexes bearing different ligand system wherein one is mono-NHC nickel(II) complex and the other is a bis-NHC nickel(II) complex were compared and studied in terms of morphology and electrochemical glucose sensing. The kinetics and sensitivity of the nickel(II) complexes were significantly enhanced by the mesoporous carbon and demonstrated high electrode sensitivity (2.57–124.92 μA mM⁻¹ cm⁻²) at a fixed potential towards glucose detection. The chronoamperometric studies evidenced the detection of glucose up to 27.5 mM with a linear range of detection up to 9.5 mM (LOD of 44.59 μM). The selectivity towards glucose in the presence of other blood constituents was investigated. Finally, the stability was studied after 18 days of electrode preparation, and negligible variation in the glucose sensing performance was found. The electrocatalysts prepared are found to be the viable candidates for potential engineering high-performance molecular non-enzymatic glucose sensor.

中文翻译：

源自单碳烯或双碳烯配位镍 (II) 配合物的葡萄糖电催化剂及其介孔碳复合材料

分子电催化剂在精确的配体场下以明确的几何形状包含金属原子，可用于氧化还原反应，在众多电催化反应中具有无限的意义。在此，我们报告了锚定在空间变化的 1,2,4-三唑-5-亚基配体上的镍基分子电催化剂。从形态和电化学葡萄糖传感方面比较和研究了两种带有不同配体系统的金属配合物，其中一种是单-NHC镍（II）配合物，另一种是双-NHC镍（II）配合物。介孔碳显着增强了镍 (II) 配合物的动力学和灵敏度，并显示出高电极灵敏度 (2.57–124.92 μA mM ^-1 cm ^-²) 对葡萄糖检测的固定电位。计时电流法研究证明可检测到高达 27.5 mM 的葡萄糖，线性检测范围高达 9.5 mM（LOD 为 44.59 μM）。研究了在其他血液成分存在下对葡萄糖的选择性。最后，在电极制备 18 天后研究稳定性，发现葡萄糖传感性能的变化可以忽略不计。发现制备的电催化剂是潜在工程高性能分子非酶葡萄糖传感器的可行候选者。

更新日期：2021-11-30

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