Preparation of two new polyimide bond linked porous covalent organic frameworks and their fluorescence sensing application for sensitive and selective determination of Fe3+

Ting Wang; Rui Xue; Huiqin Chen; Peiling Shi; Xi Lei; Yuli Wei; Hao Guo; Wu Yang

doi:10.1039/C7NJ02134H

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Preparation of two new polyimide bond linked porous covalent organic frameworks and their fluorescence sensing application for sensitive and selective determination of Fe³⁺†

Ting Wang,^a Rui Xue,^a Huiqin Chen,^a Peiling Shi,^a Xi Lei,^a Yuli Wei,^a Hao Guo*^a and Wu Yang

*^a

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* Corresponding authors

^a College of Chemistry and Chemical Engineering, Key Lab of Bioelectrochemistry and Environmental Analysis of Gansu Province, Northwest Normal University, Lanzhou 730070, P. R. China
E-mail: xbsfda123@126.com, haoguo12@126.com
Tel: +86 9 317971806

Abstract

Two new polyimide based porous covalent organic frameworks (PI-COF 201 and PI-COF 202) were synthesized in high yields by directly heating mixtures of melamine and pyromellitic dianhydride and naphthalenetetracarboxylic dianhydride in a N₂ atmosphere, respectively. Their structures and properties were characterized using elemental analysis, Fourier transform infrared spectra, X-ray photoelectron spectroscopy, X-ray powder diffraction, N₂ adsorption–desorption and scanning electron microscopy and their fluorescence properties were studied in detail. These two COFs emitted strong fluorescence in appropriate solvents that originated from the π* → n transition caused by the high electro-delocalization and inherently rigid structure of the COF materials. The strong quenching effects of Fe³⁺ on the fluorescence of the COFs allowed selective chemosensing for Fe³⁺.

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Article information

DOI: https://doi.org/10.1039/C7NJ02134H
Article type: Paper
Submitted: 14 Jun 2017
Accepted: 02 Oct 2017
First published: 02 Oct 2017

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New J. Chem., 2017,41, 14272-14278

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Preparation of two new polyimide bond linked porous covalent organic frameworks and their fluorescence sensing application for sensitive and selective determination of Fe³⁺

T. Wang, R. Xue, H. Chen, P. Shi, X. Lei, Y. Wei, H. Guo and W. Yang, New J. Chem., 2017, 41, 14272 DOI: 10.1039/C7NJ02134H

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