Yu Mingke, Yao Xu, Wang Xinyu, Li Yuxin, Li Guangming
Key Laboratory of Function Inorganic Material Chemistry (MOE), School of Chemistry and Material Science, Heilongjiang University, Harbin 150080, China.
Polymers (Basel). 2019 Jan 9;11(1):99. doi: 10.3390/polym11010099.
Developing multi-selective luminescence sensing technology to differentiate serial compounds is very important but challenging. White-light-emitting decoding sensing based on lanthanide metal-organic frameworks (Ln-MOFs) is a promising candidate for multi-selective luminescence sensing application. In this work, three isomorphic Ln-MOFs based on H₃dcpcpt (3-(3,5-dicarboxylphenyl)-5-(4-carboxylphenl)-1H-1,2,4-triazole) ligand, exhibiting red, blue, and green emission, respectively, have been synthesized by solvothermal reactions. The isostructural mixed Eu/Gd/Tb-dcpcpt is fabricated via the in-situ doping of different Ln ions into the host framework, which can emit white light upon the excitation at 320 nm. It is noteworthy that this white-light-emitting complex could serve as a convenient luminescent platform for distinguishing eight frequently-used antibiotics: five through luminescence-color-changing processes (tetracycline hydrochloride, yellow; nitrofurazone, orange; nitrofurantoin, orange; sulfadiazine, blue; carbamazepine, blue) and three through luminescence quenching processes (metronidazole, dimetridazole, and ornidazole). Moreover, a novel method, 3D decoding map, has been proposed to realize multi-selective luminescence sensing applications. This triple-readout map features unique characteristics on luminescence color and mechanism. The mechanism has been systematically interpreted on the basis of the structural analysis, energy transfer and allocation process, and peak fitting analysis for photoluminescence spectra. This approach presents a promising strategy to explore luminescent platforms capable of effectively sensing serial compounds.
开发用于区分系列化合物的多选择性发光传感技术非常重要但具有挑战性。基于镧系金属有机框架（Ln-MOFs）的白光发射解码传感是多选择性发光传感应用的一个有前途的候选者。在这项工作中，通过溶剂热反应合成了三种基于H₃dcpcpt（3-(3,5-二羧基苯基)-5-(4-羧基苯基)-1H-1,2,4-三唑）配体的同构Ln-MOFs，分别呈现红色、蓝色和绿色发射。通过将不同的Ln离子原位掺杂到主体框架中制备了同结构的混合Eu/Gd/Tb-dcpcpt，其在320 nm激发下可发射白光。值得注意的是，这种白光发射配合物可以作为一个方便的发光平台，用于区分八种常用抗生素：五种通过发光颜色变化过程（盐酸四环素，黄色；呋喃西林，橙色；呋喃妥因，橙色；磺胺嘧啶，蓝色；卡马西平，蓝色），三种通过发光猝灭过程（甲硝唑、二甲硝唑和奥硝唑）。此外，还提出了一种新颖的方法——3D解码图，以实现多选择性发光传感应用。这种三重读出图在发光颜色和机制上具有独特的特征。基于结构分析、能量转移和分配过程以及光致发光光谱的峰拟合分析，对该机制进行了系统的解释。这种方法为探索能够有效传感系列化合物的发光平台提供了一种有前途的策略。
