Abstract
The interaction between psoralen (PSA) and cucurbit[8]uril (Q[8]) was studied by UV spectroscopy, fluorescence spectroscopy, infrared spectroscopy, 1H NMR and X-ray crystal diffraction. The results showed that PSA and Q[8] can form a 2:1 host–guest inclusion complex with a binding constant of 1.83 × 106 M−2. PSA and PSA2@Q[8] can be used as fluorescent probes to selectively recognize Fe3+. The recognition mechanism is due to the coordination effect of Fe3+, the electron transfer in PSA and PSA2@Q[8] reduces fluorescence intensity and leads to fluorescence quenching. The fluorescence intensity of PSA and PSA2@Q[8] showed a good linear correlation with the concentration of Fe3+ at 3.0 × 10–5–2.4 × 10–4 M and 6.0 × 10–6–4.2 × 10–5 M, and the limit of detection was 1.06 × 10–7 M and 1.05 × 10–8 M, respectively, which can quantitatively detect trace Fe3+ in aqueous solution.
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The Science and Technology Support Plan of Guizhou Province [GuiZhou Science and Technology Cooperation Support (2020)4Y218] is acknowledged.
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Xuanxun Wang and Qianjun Zhang wrote the main manuscript text and Guangyan Luo prepared Fig. 9. Other authors reviewed the manuscript.
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Wang, X., Luo, G., Zhang, L. et al. Study on the recognition of psoralen and psoralen@cucurbit[8]uril fluorescent probe for Fe3+ ions. J Incl Phenom Macrocycl Chem 102, 893–903 (2022). https://doi.org/10.1007/s10847-022-01169-8
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DOI: https://doi.org/10.1007/s10847-022-01169-8