4.7 Article

A cucurbit[6]uril-based carbon dot for recognizing metal ions and anions in solutions

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PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.saa.2023.123632

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Cucurbit[6]uril; Mandelic acid; Carbon quantum dots; Fluorescent probe

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In this study, fluorescent nitrogen doped carbon quantum dots (CQDs) were synthesized using cucurbit[6]uril (Q[6]) and mandelic acid (MA) via a hydrothermal method. The performance of the Q[6]-CQDs was characterized by fluorescence and NMR spectroscopy, and the crystal structure of Q[6]-MA-[CdCl4]2- was determined by X-ray crystallography. A universal fluorescent probe for detecting and recognizing various ions was developed based on the Q[6]-CQDs, showing good water solubility and stable optical properties.
In this paper, fluorescent nitrogen doped carbon quantum dots (CQDs) were synthesized by a hydrothermal method using cucurbit[6]uril (Q[6]) and mandelic acid (MA). Compared with other carbon quantum dots, cucurbit[6]uril has the advantage that its original rigid macrocyclic skeleton was completely retained during the synthesis process. In addition, the performance of the Q[6]-CQDs were characterized by fluorescence and NMR spectroscopies, then the crystal structure of Q[6]-MA-[CdCl4]2-was determined by the single crystal X-ray crystallography. The Q[6]-CQDs showed good water solubility and stable optical property. Subsequently, using the obtained Q[6]-CQDs, a universal fluorescent probe for detecting and recognizing Fe3+, Ba2+, Al3+, I- and ClO- has been developed based on macrocyclic chemistry. Under ideal conditions, the detection limits were calculated to be 3.89 x 10-6 M, 2.58 x 10-5 M, 1.42 x 10-5 M, 6.84 x 10-6 M and 1.50 x 10-5 M.

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