<br>多重发光金属有机框架作为 MOF 上的阵列，用于快速筛选和辨别硝基芳香族化合物,Analytical Chemistry

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多重发光金属有机框架作为 MOF 上的阵列，用于快速筛选和辨别硝基芳香族化合物
Analytical Chemistry ( IF 6.7 ) Pub Date : 2024-04-04 , DOI: 10.1021/acs.analchem.3c05282
Beining Chen ₁ , Xiaojing Mo ₁ , Xiaolei Qu ₁ , Zhaoyi Xu ₁ , Shourong Zheng ₁ , Heyun Fu ₁

Affiliation

荧光阵列技术因其高灵敏度、低成本和多目标检测能力而引起了传感领域的极大兴趣。然而，传统的阵列传感依赖于多个独立的传感器，因此通常需要耗时费力的测量过程。在此，我们介绍了一种新型金属有机框架（MOF）荧光阵列策略，它将多个阵列元件集成到单个MOF矩阵中，以实现多种目标分析物的轻松传感和区分。作为概念验证系统，我们构建了包含三种不同发射通道的发光 MOF，包括镧系元素离子（铕/Eu ³⁺ ，红色发射）、荧光染料（7-羟基香豆素-4-乙酸/HCAA、蓝色发射）和 MOF 本身（UiO-66 型 MOF，蓝紫色发射）。选择五种结构相似的硝基芳香族化合物（NAC）作为目标。 MOF 上阵列的所有三个通道均对 NAC 表现出快速且稳定的荧光猝灭响应（30 秒内达到响应平衡）。由于不同的猝灭机制，包括光诱导电子转移、能量竞争和内部过滤效应，每个通道对每个 NAC 都会产生不同的响应。使用线性判别分析，MOF 上的阵列成功地区分了不同浓度的五种 NAC 及其混合物，并表现出量化单个 NAC 的良好灵敏度（检测限值低于饮用水中的建议浓度）。此外，该阵列还显示了在真实水样中检测和区分多种 NAC 的可行性。所提出的“MOF 阵列”策略简化了多目标辨别程序，并为各种传感应用带来了巨大的希望。

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Multiple-Emitting Luminescent Metal–Organic Framework as an Array-on-a-MOF for Rapid Screening and Discrimination of Nitroaromatics

Fluorescence array technologies have attracted great interest in the sensing field because of their high sensitivity, low cost, and capability of multitarget detection. However, traditional array sensing relies on multiple independent sensors and thus often requires time-consuming and laborious measurement processes. Herein, we introduce a novel fluorescence array strategy of the array-on-a-metal–organic framework (MOF), which integrates multiple array elements into a single MOF matrix to achieve facile sensing and discrimination of multiple target analytes. As a proof-of-concept system, we constructed a luminescent MOF containing three different emitting channels, including a lanthanide ion (europium/Eu³⁺, red emission), a fluorescent dye (7-hydroxycoumarin-4-acetic acid/HCAA, blue emission), and the MOF itself (UiO-66-type MOF, blue-violet emission). Five structurally similar nitroaromatic compounds (NACs) were chosen as the targets. All three channels of the array-on-a-MOF displayed rapid and stable fluorescence quenching responses to NACs (response equilibrium achieved within 30 s). Different responses were generated for each channel against each NAC due to the various quenching mechanisms, including photoinduced electron transfer, energy competition, and the inner filter effect. Using linear discriminant analysis, the array-on-a-MOF successfully distinguished the five NACs and their mixtures at varying concentrations and demonstrated good sensitivity to quantify individual NACs (detect limit below the advisory concentration in drinking water). Moreover, the array also showed feasibility in the sensing and discrimination of multiple NACs in real water samples. The proposed “array-on-a-MOF” strategy simplifies multitarget discrimination procedures and holds great promise for various sensing applications.

更新日期：2024-04-04

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