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A Salen-based covalent organic polymer as highly selective and sensitive fluorescent sensor for detection of Al3+, Fe3+ and Cu2+ ions

Ju, Pengyao, Su, Qing, Liu, Ziqian, Li, Xiaodong, Guo, Bixuan, Liu, Wanting, Li, Guanghua, Wu, Qiaolin
Journal of materials science 2019 v.54 no.1 pp. 851-861
Fourier transform infrared spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy, aluminum, carbon, copper, fluorescence, ions, iron, nuclear magnetic resonance spectroscopy, polymers, protocols, scanning electron microscopy, schiff bases, stable isotopes, thermogravimetry
A novel covalent organic polymer (Salen-COP) based on Salen-type Schiff base was synthesized by one-pot protocol involving the self-condensation of 3-formyl-4-hydroxyphenylboronic acid and the subsequent aldehyde–amine condensation with benzene-1,2-diamine. The Salen-COP was characterized by ¹³C CP/MAS NMR, Fourier transform infrared spectroscopy, thermogravimetric analysis, X-ray photoelectron spectroscopy and X-ray powder diffraction spectrometry analysis. The morphological features of Salen-COP were also analyzed using scanning electron microscopy. The Salen-COP exhibited the significant fluorescence enhancing for the sensing of Al³⁺, while the obtained polymer also exhibited the dramatic fluorescence quenching for the sensing of Fe³⁺ and Cu²⁺. The detection limits were calculated to be 0.248 µM for Salen-COP@Al³⁺, 0.545 µM for Salen-COP@Fe³⁺ and 0.140 µM for Salen-COP@Cu²⁺, respectively. Furthermore, the Salen-COP was founded to be a reversible chemosensor for Al³⁺, Fe³⁺ and Cu²⁺ ions, which provided a unique opportunity in the development of multi-response polymer-based sensors.