Department of Chemistry, Faculty of Science, University of Zakho, Zakho 42002, Kurdistan Region, Iraq.
Department of Horticulture, Technical College of Akre, Duhok Polytechnic University, Duhok 42001, Kurdistan Regin, Iraq.
ACS Appl Mater Interfaces. 2023 Oct 4;15(39):46098-46107. doi: 10.1021/acsami.3c11950. Epub 2023 Sep 21.
Dual-state emitters (DSEs) are entities that exhibit fluorescence in both the solution and solid state, which open up a wide range of possibilities for their utilization in various fields. The development of detection platforms using intrinsic luminescent metal-organic frameworks (LMOFs) is highly desirable for a variety of applications. DSE MOFs as a subclass of intrinsic LMOFs are highly attractive due to no need for encapsulation/functionalization by fluorophores and/or using luminescent linkers. Herein, a highly stable intrinsic dual-state blue emission (λ = 425 nm) zinc-based MOF with rodlike nanostructures (denoted as UoZ-2) was synthesized and characterized. To the best of our knowledge, intrinsic DSE of Zn-MOFs with blue emission in the dispersed form in solution and solid-state fluorescence have not been reported yet. When tetracycline (TC) was added, a continuous color evolution from blue to greenish-yellow with dramatic enhancement was observed due to aggregation induced emission (AIE). Thus, a sensitive ratiometry-based visual detection platform, in solution and on paper independently, was designed for detection of TC exploiting the DSE and AIE properties of UoZ-2 alone and UoZ-2:TC. The detection limit was estimated to be 4.5 nM, which is considered to be one of the most sensitive ratiometric fluorescent probes for TC sensing. The ratiometry paper-based UoZ-2 sensor displays a reliable TC quantitative analysis by recognizing RGB values in the on-site TC detection with satisfactory recoveries.
双态发射器（DSE）是指在溶液和固态中均表现出荧光的实体，这为它们在各个领域的应用开辟了广泛的可能性。使用本征发光金属有机骨架（LMOFs）开发检测平台是非常可取的，因为它适用于各种应用。DSE MOF 作为本征 LMOF 的子类，由于不需要用荧光团封装/官能化，也不需要使用发光连接体，因此具有很高的吸引力。在此，合成并表征了一种具有棒状纳米结构的高度稳定的本征双态蓝色发射（λ = 425nm）锌基 MOF（表示为 UoZ-2）。据我们所知，在溶液中以分散形式和固态荧光中具有蓝色发射的 Zn-MOF 的本征 DSE 尚未有报道。当加入四环素（TC）时，由于聚集诱导发光（AIE），观察到从蓝色到绿黄色的连续颜色演变，同时伴随着显著增强。因此，设计了一种基于比率的灵敏可视化检测平台，可独立在溶液中和纸上检测 TC，利用 UoZ-2 本身和 UoZ-2:TC 的 DSE 和 AIE 特性。检测限估计为 4.5 nM，这被认为是 TC 传感中最灵敏的比率荧光探针之一。基于比率的纸质 UoZ-2 传感器通过识别现场 TC 检测中的 RGB 值，对 TC 进行可靠的定量分析，回收率令人满意。
