Abstract

Exploring fluorescence sensing materials for dichromate (Cr2O7 2−) has garnered considerable attention due to its high toxicity to organisms. In this work, a cationic SiF6 2--containing metal-organic framework (SIFSIX MOF) with the formula [Cd(TPI)2(H2O)2]·SiF6·4H2O (1) was synthesized by the reaction of 2,4,5-tri(4-pyridyl)imidazole (TPI) and CdSiF6 at room temperature. Crystal structural analysis revealed that the coordination between TPI and Cd2+ in 1 formed one-dimensional (1D) TPI-Cd coordination chains, while the lattice SiF6 2− not only acted as the counterion to maintain the charge balance but also contributed to formation of the three-dimensional (3D) supramolecular structure through hydrogen bonds. Fluorescence sensing experiments suggested that 1 could work as an efficient selective sensor towards Cr2O7 2− via a fluorescence quenching effect with fast response, high sensitivity and superior anti-interfering capacity. Mechanistic studies confirmed that the fluorescence quenching may be attributed to the resonance energy transfer and structural transformation caused by anion exchange.

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