Department of Chemistry and Chemical Engineering, Jining University, Qufu 273155, P. R. China.
State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210023, P. R. China.
Inorg Chem. 2020 May 18;59(10):7181-7187. doi: 10.1021/acs.inorgchem.0c00620. Epub 2020 Apr 30.
Lanthanide (such as Tb and Eu) metal-organic frameworks (MOFs) have been widely used in fluorescent probes because of their multiple coordination modes and brilliant fluorescence characteristic. Many lanthanide MOFs were applied in detecting metal ions, inorganic anions, and small molecules. However, it's rarely reported that Ln-MOF was devoted to detecting malachite green (MG) and uric acid (UA). We prepared a europium-based metal-organic framework (Eu-TDA) (TDA = 2,5-thiophenedicarboxylic acid group). Luminescence studies demonstrated that Eu-TDA can rapidly detect MG and UA with excellent selectivity and sensitivity, where individual quenching efficiency (MG: 5.8 × 10 M; UA: 4.15 × 10 M) and detection limit (MG: 0.0221 μM; UA: 0.689 μM) were regarded as the excellent MOF sensors for detecting MG and UA. The quenching of Eu-TDA's fluorescence emission by MG and UA was likely due to the spectral overlap, energy transfer, and competition. Among 11 metal cations and 14 anions, Eu-TDA can quickly and effectively recognize MG and UA with highly selective and sensitive properties. Our method possesses potential application in detecting UA in human blood and MG in the fishpond.
镧系金属（如 Tb 和 Eu）金属有机骨架（MOFs）由于其多种配位模式和出色的荧光特性而被广泛用于荧光探针。许多镧系 MOFs 被应用于检测金属离子、无机阴离子和小分子。然而，很少有报道称 Ln-MOF 用于检测孔雀石绿（MG）和尿酸（UA）。我们制备了一种基于铕的金属有机骨架（Eu-TDA）（TDA = 2,5-噻吩二甲酸基团）。发光研究表明，Eu-TDA 可以快速、高选择性和高灵敏度地检测 MG 和 UA，其单独的猝灭效率（MG：5.8×10 M；UA：4.15×10 M）和检测限（MG：0.0221 μM；UA：0.689 μM）被认为是用于检测 MG 和 UA 的优秀 MOF 传感器。MG 和 UA 对 Eu-TDA 荧光发射的猝灭可能是由于光谱重叠、能量转移和竞争。在 11 种金属阳离子和 14 种阴离子中，Eu-TDA 可以快速有效地识别 MG 和 UA，具有高选择性和灵敏度。我们的方法在检测人血中的 UA 和鱼塘中的 MG 方面具有潜在的应用。
