Flexible Ligands Constructed Metal–Organic Frameworks as Visual Test Paper for Fluorescent Detection

IF 4.3 3区材料科学 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC ACS Applied Electronic Materials Pub Date : 2024-09-19 DOI:10.1021/acs.cgd.4c01052

Qiao Han, Shuai Liu, Si-Qi Bao, Xiao Li, Tan Su, Chang Liu, Mengke Wang, Zhong-min Su

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Abstract

In this paper, four new metal–organic frameworks (MOFs) were synthesized by the solvothermal method based on two imidazolidyl flexible ligands, named, CUST-662–665, [Zn(pbbm)(HBTC)]·3H₂O (CUST-662), [Cd₂(pbbm)₂(BTC)(NO₃)·H₂O]·2H₂O (CUST-663), [Cd₃(bbbm)₃(BTC)₂·4H₂O]·3H₂O (CUST-664), and [Zn₂(bbbm)₂(BTC)(HCOO)]·3H₂O (CUST-665). All four MOFs with blue fluorescence show excellent performance in the detection of pollutants including Fe³⁺, Cr₂O₇^2–, trinitrophenol (TNP), and tetracycline antibiotics. Furthermore, the color of CUST-664 and CUST-665 changes from blue to yellow when detecting tetracycline (TC) and oxytetracycline (OTC), which can be further developed as simple and rapid field visual test paper as antibiotic detection devices. The detection limits of TNP, OTC, and TC can reach 0.36, 0.90, and 1.39 ppb, respectively, which are better than that of most of the reported fluorescence sensing materials. Moreover, CUST-662–665 display high selectivity, sensitivity, stability, and recycling efficiency. The competitive absorption between the crystals and pollutants was an important factor affecting fluorescence quenching. This work provides an experimental basis for subsequent fluorescence visualization field detection.

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灵活配体构建的金属有机框架作为荧光检测的可视试纸

本文基于两种咪唑烷基柔性配体，采用溶热法合成了四种新型金属有机框架（MOFs），分别命名为 CUST-662-665、[Zn(pbbm)(HBTC)]-3H2O（CUST-662）、[Cd2(pbbm)2(BTC)(NO3)-H2O]-2H2O（CUST-663）、[Cd3(bbbm)3(BTC)2-4H2O]-3H2O（CUST-664）和[Zn2(bbbm)2(BTC)(HCOO)]-3H2O（CUST-665）。这四种具有蓝色荧光的 MOFs 在检测污染物（包括 Fe3+、Cr2O72-、三硝基苯酚 (TNP) 和四环素抗生素）方面均表现出优异的性能。此外，在检测四环素（TC）和土霉素（OTC）时，CUST-664 和 CUST-665 的颜色由蓝色变为黄色，可进一步开发为简便快速的现场目测试纸抗生素检测装置。TNP、OTC和TC的检测限分别可达0.36、0.90和1.39 ppb，优于大多数已报道的荧光传感材料。此外，CUST-662-665 还具有较高的选择性、灵敏度、稳定性和回收效率。晶体与污染物之间的竞争吸收是影响荧光淬灭的重要因素。这项工作为后续的荧光可视化场检测提供了实验基础。

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