The application of covalent organic frameworks (COFs) in electrochemiluminescence (ECL) is promising in environmental monitoring. Developing an emerging design strategy to expand the class of COF-based ECL luminophores is highly desirable. Here, a COF-based host–guest system was constructed through guest molecular assembly to deal with nuclear contamination analysis. The efficient charge transport network was formed by inserting an electron-withdrawing guest tetracyanoquinodimethane (TCNQ) into the open space of the COF host (TP-TBDA; TP = 2,4,6-trihydroxy-1,3,5-benzenetricarbaldehyde and TBDA = 2,5-di(thiophen-2-yl)benzene-1,4-diamine) with an electron-donating property; the construction of the COF-based host–guest system (TP-TBDA@TCNQ) triggered the ECL emission of non-emitting TP-TBDA. Furthermore, the dense active sites in TP-TBDA were utilized to capture the target substance UO₂²⁺. The presence of UO₂²⁺ broke the charge-transfer effect in TP-TBDA@TCNQ, resulting in the weakening of the ECL signal, thus the established ECL system integrating the low detection limit with high selectivity monitors UO₂²⁺. This COF-based host–guest system provides a novel material platform for constructing late-model ECL luminophores and creates an opportunity for the vigorous ECL technology.

中文翻译：

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用于铀酰电化学发光传感的共价有机框架中的客体分子组装策略

共价有机框架 (COF) 在电化学发光 (ECL) 中的应用在环境监测中具有广阔的应用前景。非常需要开发一种新兴的设计策略来扩展基于 COF 的 ECL 发光体的类别。在这里，通过客体分子组装构建了一个基于 COF 的主客体系统来处理核污染分析。通过将吸电子客体四氰基醌二甲烷 (TCNQ) 插入 COF 主体的开放空间（TP-TBDA；TP = 2,4,6-三羟基-1,3,5-苯三甲醛和 TBDA），形成有效的电荷传输网络= 2,5-di(thiophen-2-yl)benzene-1,4-diamine) 具有给电子特性；基于COF的主客体系统（TP-TBDA@TCNQ）的构建触发了非发射TP-TBDA的ECL发射。此外，₂ ²⁺。_{UO 2} ²⁺的存在破坏了TP-TBDA@TCNQ中的电荷转移效应，导致ECL信号减弱，因此建立了集低检测限和高选择性于一体的ECL系统监测UO ₂ ²⁺。这种基于 COF 的主客体系统为构建新型 ECL 发光体提供了一个新的材料平台，并为蓬勃发展的 ECL 技术创造了机会。