Selective and Sensitive Discrimination of Zinc and Cadmium Based on a Novel Fluorescent Porous Organic Polymer

Autor: Zu-Qi Zhong, Sai-Jin Xiao, Wang Lizhi, Heng-Xin Zhao, Yu-Nan Wu, An-Ting Qiu, Yuan Mingyue
Rok vydání: 2021
Předmět:
Zdroj: Journal of Analysis and Testing. 5:235-241
ISSN: 2509-4696
2096-241X
Popis: Zinc and cadmium are two main transition metal ions and play profound important roles in environmental and human health. But the distinctive detection of these two ions is still challenging since they belong to the same periodic group and have similar chemical properties. A fluorescent bipyridine-based porous organic polymer (Bpy-POP) containing aggregation caused quenching (ACQ) units (anthracene) and metal ions recognition units (bipyridine) was synthesized through the Schiff base condensation reaction. In the DMF/H2O mixtures with the water fractions of 90%, the Bpy-POP aggregated and the fluorescent Bpy-POP quenched subsequently due to the ACQ effect of anthracene in the skeleton (“OFF” state). With the addition of Zn2+ or Cd2+, however, the strong coordination of the bipyridine units from the adjacent Bpy-POPs with Zn2+ or Cd2+ induced the partial dispersion of large Bpy-POP aggregates. Consequently, the fluorescence intensities enhanced dramatically as well as the fluorescence emission shifted to redder region, showing an “ON” state. Combing the fluorescence increasing efficiency and the maximum emission wavelength shift degree together, Zn2+ and Cd2+ can be selectively discriminated and quantitatively detected, which exhibits a great promising of the present Bpy-POP based method in Zn2+ and Cd2+ monitoring in real samples.
Databáze: OpenAIRE
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