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Article Abstract
In a dynamic system, fluorescent probes with dual signals not only efficiently identify target analytes but also resist interference from the system, aiding in further system differentiation. A new three-dimensional (4,6)-connected Zn(II)-based metal-organic framework with the formula {[Zn(BTDI)(3,5-BBIP)]·2.5HO·2DMF} () was solvothermally used with 5,5'-(benzothiadiazole-4,7-diyl)diisophthalic acid (HBTDI), which incorporates benzothiadiazole luminescent groups. displays a fluorescence "turn-on" effect and a blue-shift behavior toward the HPO anion in formamide solution, with a limit of detection of 0.50 μM. Remarkably, in a pH-dynamic system regulated by NaOH/HCl, demonstrates a fluorescence "on-off-on" effect and a blue-red-blue-shift behavior toward the HPO anion. Furthermore, the fluorescence "turn-on" and blue-shift effect observed between and HPO may be attributed to host-guest interaction and an absorbance-caused enhancement mechanism.
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