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 K sv (MG: 5.8 × 105 M–1; UA: 4.15 × 104 M–1) 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.

Two Eu-based MOF fluorescent sensors, Eu2(CHDA)2(C2O4)(H2O)4 (1) (CHDA = 1,4-cyclohexanedicarboxylic acid, C2O4 = oxalate group) and Eu2(PDA)3(H2O)3 (2) (p-Phenylenediacetic acid = PDA), were prepared for the rapid detection of uric...

A europium-based CP fluorescent sensor was synthesized and exhibited excellent recognition ability for malachite green (MG) and metal cations (Cr3+, Fe3+ and Cu2+).

Lanthanide MOFs (Ln‐MOFs) have been widely used in biological imaging and fluorescence detection due to their remarkable optical advantages and variable structural designability. We prepared a terbium‐based metal‐organic framework (Tb‐TDA) and applied to the research of fluorescence detection. The detection result demonstrated that Tb‐TDA can efficiently recognize malachite green (MG), Fe3+ and MnO4− by fluorescent quenching, having high quenching efficiency Ksv (7.02×104 M−1 for MG; 1.06×104 M−1 for Fe3+; 1.59×104 M−1 for MnO4−) and low detection limit (MG: 0.0765 μM; Fe3+: 0.697 μM; MnO4−: 0.612 μM). The quenching of Tb‐TDA's fluorescence emission by MG, Fe3+ and MnO4− was likely due to the spectral overlap, energy transfer and competition. Among seven analytes, 13 metal cations and 13 anions, Tb‐TDA can fast and effectively recognize MG, Fe3+ and MnO4− with high quenching efficiency Ksv and low detection limit, representing excellent selectivity and sensitivity. This work provides new perspectives for the development of lanthanide MOFs in detecting malachite green and heavy metal ions, possessing the potential applications in wastewater disposal and environmental protection.