In this study, we constructed a highly sensitive and selective electrochemical sensing strategy for l-ascorbic acid (AA) based on a covalent organic framework (COF)-loading non-noble transition metal Co ion and macrocyclic cationic pillar[6]arene (CP6) nanocomposite (CP6-COF-Co). The COF plays a crucial role in anchoring the Co ion according to its crystalline porous and multiple coordination sites and has an outstanding performance for building an electrochemical sensing platform based on a unique two-dimensional structure. Accordingly, the transition-metal Co ion can be successfully anchored on the framework of COF and shows strong catalytic activity for the determination of AA. Moreover, introduction of host–guest recognition based on CP6 and AA can bring new properties for enhancing selectivity, sensitivity, and practical application in real environment. Host–guest interactions between CP6 and AA were evaluated by the ¹H NMR spectrum. When compared with other literatures, our method displayed a lower determination limit and broader linear range. To the best of our knowledge, this is the first study carried out for the non-noble transition-metal Co ion, COF, and pillar[6]arene hybrid material in sensing field, which has a potential value in sensing, catalysis, and preparation of advanced multifunction materials.

中文翻译：

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基于有机骨架负载过渡金属离子和阳离子柱[6]芳烃的纳米复合材料及其在l-抗坏血酸电化学检测中的应用

在这项研究中，我们构建了高灵敏度和选择性电化学传感策略升-基于共价有机骨架（COF）负载非贵族过渡金属Co离子和大环阳离子柱[6]芳烃（CP6）纳米复合材料（CP6-COF-Co）的抗坏血酸（AA）。COF根据其结晶的多孔性和多个配位部位在锚定Co离子方面起着至关重要的作用，并且在基于独特的二维结构构建电化学传感平台方面具有出色的性能。因此，过渡金属Co离子可以成功地锚定在COF的框架上，并显示出强大的催化活性，可用于测定AA。此外，引入基于CP6和AA的主客体识别可以带来新的属性，以增强选择性，灵敏度和在实际环境中的实际应用。CP6和AA之间的主客互动通过¹ H NMR谱。与其他文献相比，我们的方法显示出更低的测定限和更宽的线性范围。据我们所知，这是在传感领域中对非贵金属过渡金属Co离子，COF和支柱[6]芳烃杂化材料进行的首次研究，该材料在传感，催化和催化方面具有潜在价值。制备先进的多功能材料。