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Published on: March 8, 2024
Highly Stable Zn(II) Metal-Organic Framework as an "On-Off-On" Fluorescence Sensor toward H2PO4- Anion in the
Yu Li1, Chen Cao1, Teng-Fei Zheng1
1School of Chemistry and Chemical Engineering, Jiangxi Provincial Key Laboratory of Functional Crystalline Materials Chemistry, Jiangxi University of Science and Technology, Ganzhou, Jiangxi Province 341000, P.R. China.
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 {[Zn2(BTDI)(3,5-BBIP)]·2.5H2O·2DMF} (JXUST-50) was solvothermally used with 5,5'-(benzothiadiazole-4,7-diyl)diisophthalic acid (H4BTDI), which incorporates benzothiadiazole luminescent groups. JXUST-50 displays a fluorescence "turn-on" effect and a blue-shift behavior toward the H2PO4 anion in formamide solution, with a limit of detection of 0.50 μM. Remarkably, in a pH-dynamic system regulated by NaOH/HCl, JXUST-50 demonstrates a fluorescence "on-off-on" effect and a blue-red-blue-shift behavior toward the H2PO4 anion. Furthermore, the fluorescence "turn-on" and blue-shift effect observed between JXUST-50 and H2PO4 may be attributed to host-guest interaction and an absorbance-caused enhancement mechanism.
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