A multi-binding site hydrazone-based chemosensor for Zn(ii ) and Cd(ii ): a new strategy for the detection of metal ions in aqueous media based on aggregation-induced emission
| Autor: | Chen Jiao, Jia-Bin Li, Dong-Dong Yang, Sai Li, Min Wu, Yang Kang, Xiang-Jun Zheng, Lin-Pei Jin, Qiong-Fang Liang, Han-Wen Zheng |
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| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | Dalton Transactions. 50:1507-1513 |
| ISSN: | 1477-9234 1477-9226 |
| DOI: | 10.1039/d0dt04062b |
| Popis: | A multi-binding site chemosensor, N-(3-methoxy-2-hydroxybenzylidene)-3-hydroxy-2-naphthahydrazone (H3L), with excited-state intramolecular proton transfer (ESIPT) behaviour was prepared and characterized. It possesses no aggregation-induced emission (AIE) characteristics but can detect Cd2+ and Zn2+ ions selectively in the "off-on" mode based on the AIE of their complexes in the media of THF/HEPES and THF/H2O, respectively, which will provide a new strategy for target detection based on AIE. The detection limits of Zn2+ and Cd2+ were 9.85 × 10-9 M and 1.27 × 10-7 M, respectively. The aggregates of the complexes formed in the detection system were confirmed by DLS data and SEM images. The corresponding Zn2+ (1) and Cd2+ (2) complexes were prepared to investigate the response mechanism. Powder X-ray diffraction and single crystal X-ray diffraction proved that complex 1 is the species formed in the detection system. The chemosensor coordinates with the Cd2+ and Zn2+ ions in different formation and coordination modes, leading to the emission position of the aggregates at 560 and 645 nm, respectively, based on which Cd2+ ions were successfully differentiated from Zn2+ ions. Moreover, the detection of Cd2+ and Zn2+ ions was realized qualitatively via test paper and quantitatively in water. |
| Databáze: | OpenAIRE |
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