A Terbium‐Based MOF as fluorescent probe for the detection of Malachite Green, Fe³⁺ and MnO₄⁻

Abstract

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.

A Precise Microreactor for Ultralong Visible Chemiluminescence

“…Metal–organic frameworks (MOFs) are porous coordination polymers with periodic network structures composed of organic ligands and inorganic metal ions/clusters. Due to the large specific surface area and tunable framework structure, MOFs exhibit attractive functional properties in gas adsorption and separation, heterogeneous catalysis, , drug delivery, and fluorescent probes. − They are also a talented platform for the CL process because the three key elements of CL (catalytic center: metal cluster; chromophore: organic ligand; controllable diffusion path: open and divisible channel) can be precisely integrated into a framework, which can be considered as an atomically precise microreactor for short energy transfer path, weaken relaxation of F, and controllable raw material diffusion rate (Scheme b). , Recently, some attempts at MOFs have been performed in CL systems. For example, Al Lawati et al loaded Rhodamine B in Co-MOF and exploited the catalytic ability of Co-MOF to promote the strong CL emission of the (H 2 O 2 )–Rhodamine B system, Li et al enhanced the luminol/H 2 O 2 CL system by constructing a hemin-bridged MOF.…”