Liu Longjin, Wei Dongxue, Liang Hao, Zhang Yuwei, Zhang Xueyan, Zhi Yongfeng
School of Chemistry and Chemical Engineering, Hainan University, Haikou, 570228, China.
Laboratory of Preparation and Applications of Environmental Friendly Materials (Jilin Normal University), Ministry of Education, Changchun, 130103, China.
Macromol Rapid Commun. 2025 Feb;46(3):e2400711. doi: 10.1002/marc.202400711. Epub 2024 Oct 29.
Covalent Organic Frameworks (COFs) exhibit a range of exceptional attributes, including notable porosity, outstanding stability, and a precisely tuned π-conjugated network, rendering them highly promising candidates for fluorescence sensors applications. In this study, the synthesis of two emissive hydrazone-linked COFs designed for hydrazine detection is presented. The partially conjugated structure of the hydrazone linkage effectively weakens the fluorescence quenching processes induced by aggregation. Additionally, the incorporation of flexible structural components further reduces conjugation, thereby enhancing luminescent efficiency. Remarkably, these COFs possess a significant abundance of heteroatoms, enabling distinctive interactions with hydrazine molecules, which in turn results in exceptional selectivity and sensitivity for hydrazine detection. The detection limit of these COFs reaches the nanomolar range, surpassing all previously reported COFs, thereby underscoring their superior performance in chemical sensing applications.
共价有机框架（COFs）具有一系列优异特性，包括显著的孔隙率、出色的稳定性以及精确调控的π共轭网络，使其成为荧光传感器应用中极具潜力的候选材料。在本研究中，展示了两种用于肼检测的发光腙连接COFs的合成。腙键的部分共轭结构有效减弱了聚集诱导的荧光猝灭过程。此外，柔性结构组分的引入进一步降低了共轭程度，从而提高了发光效率。值得注意的是，这些COFs含有大量杂原子，能够与肼分子发生独特的相互作用，进而对肼检测具有出色的选择性和灵敏度。这些COFs的检测限达到纳摩尔范围，超过了此前报道的所有COFs，从而突出了它们在化学传感应用中的卓越性能。
