Haiying Wang

A luminescent Eu-MOF was assembled based on an amide-functionalized tetracarboxylate ligand. Eu-MOF featured a hexanuclear metal cluster [Eu6(μ3-OH)8(COO)12(H2O)6], which was further connected with organic linkers to assemble the final (4,12)-connected ftw network. The high-nuclear metal clusters endowed the resultant high connected framework with excellent chemical robustness in acidic and basic solutions with a pH ranging from 1.67 to 12.31. Consequently, Eu-MOF can be exploited as a promising multi-sensor for Fe3+ and two antibiotics of metronidazole (MDZ) and dimetronidazole (DTZ) in aqueous solutions. Even in the simulated biological buffer solution HEPES, Eu-MOF still demonstrated excellent quenching recognition ability for Fe3+ with Ksv of 1.2×104 M-1. Eu-MOF-based test paper can be developed to provide a simple and reliable detection method for MDZ and DTZ. Moreover, the at least nine-cycle detection capability of Eu-MOF for MDZ and DTZ further highlights the true application potential of this sensor.,In all, the high chemical stability, excellent fluorescence sensing ability and at least nine-cycle reusability with outstanding structural stability of Eu-MOF may spark the real application prospects of this promising multi-sensor for the detection of metal ions and antibiotics in actual biological systems.

Based on a layered Zn-MOF (1⊃NO₃⁻), anion-dependent dynamic structure and tunable luminescence were demonstrated by SC–SC transformation with free NO₃⁻ exchanged with ClO₄⁻ or BF₄⁻, and with coordinated NO₃⁻ exchanged with Cl⁻ to give a 3D structure.

Novel fluoranthene dyes were obtained by cycloaddition reactions. The fluorescence spectra in different polar organic solvents were investigated, indicating that these dyes can be used to detect the water content in organic solvents as probes.

Incorporated amide groups enable the tetratopic linker to facilitate diversity nets of lon (1) and nbo (2). Importantly, fluorescent dye DMASM can be encapsulated into 2 as a dual-emitting sensor for highly sensitive detection of antibiotics.