In this report, we have successfully prepared the hexammine cobalt(III) coordination complex [Co(NH₃)₆]³⁺ grafted onto a reduced graphene oxide (RGO) composite modified glassy carbon electrode (GCE) for the electrochemical determination of morin (MR). The RGO/[Co(NH₃)₆]³⁺ composite was prepared by a simple sonochemical technique. The as-prepared inorganic complex was characterized using suitable physical and chemical characterization techniques. The as-prepared composite was characterized by scanning electron microscopy, elemental mapping analysis and X-ray diffraction studies. In addition, the electrochemical performance of the fabricated electrode was assessed by the cyclic voltammetry, differential pulse voltammetry and electrochemical impedance spectroscopy studies. Besides, the RGO/[Co(NH₃)₆]³⁺ modified electrode had notable electrocatalytic activity towards the detection of MR. Under the optimized condition, the modified electrode showed excellent linearity ranges, acceptable limit of detection, and high sensitivity of 0.008–72.35 μM, 1.0 nM and 4.326 μA μM⁻¹ cm⁻², respectively. The fabricated electrode exhibited acceptable repeatability, reproducibility and stability. On the other hand, the proposed RGO/[Co(NH₃)₆]³⁺ modified electrodes have been applied for the detection of MR in fruit samples, and the results reveal adequate recovery.

中文翻译：

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六氨合钴（iii）配位配合物接枝还原氧化石墨烯复合材料用于水果样品中香精的灵敏和选择性电化学测定

在本报告中，我们已成功制备了接枝到还原型氧化石墨烯（RGO）复合修饰玻碳电极（GCE）上的_六胺钴（III）配位配合物[Co（NH ₃）₆ ] ^3+，用于电化学测定morin（先生）。RGO / [Co（NH ₃）₆ ] ³⁺复合材料是通过简单的声化学技术制备的。使用合适的物理和化学表征技术对所制备的无机配合物进行表征。制备的复合材料通过扫描电子显微镜，元素图谱分析和X射线衍射研究进行表征。此外，通过循环伏安法，差分脉冲伏安法和电化学阻抗谱研究评估了所制备电极的电化学性能。此外，RGO / [Co（NH ₃）₆ ] ³⁺修饰电极对MR的检测具有明显的电催化活性。在优化的条件下，修饰的电极表现出优异的线性范围，可接受的检测极限以及0.008–72.35μM，1.0 nM和4.326μAμM ^-1 cm ^-2的高灵敏度。制成的电极表现出可接受的重复性，再现性和稳定性。另一方面，提出的RGO / [Co（NH ₃）₆ ] ³⁺修饰电极已用于水果样品中MR的检测，结果表明回收率足够。