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Colorimetric and Fluorescent Probes for Real-Time Naked Eye Sensing of Copper Ion in Solution and on Paper Substrate

Colorimetric and Fluorescent Probes for Real-Time Naked Eye Sensing of Copper Ion in Solution and on Paper Substrate

Dugang Chen, Pengyu Chen, Luyi Zong, Yimin Sun, Guangchao Liu, Xianglin Yu, Jingui Qin

R Soc Open Sci. 2017 Nov 8;4(11):171161.

PMID: 29291102

Abstract:

In this paper, BT ((E)-2-(4-(4-(bis(pyridin-2-ylmethyl)amino)styryl)-3-cyano-5,5-dimethylfuran-2(5H)-ylidene)malononitrile) with strong donor-π-acceptor structure was synthesized, which showed both colorimetric and fluorescent sensing ability toward Cu2+ with high selectivity and sensitivity. Job plot and mass spectra measurement revealed a 1 : 1 coordination mode between Cu2+ and probe BT in ethanol/HEPES (1 : 4 v/v) buffer (pH 7.2) solution, and the binding constant was calculated to be 3.6 × 104 M-1. The colour of BT solution (10 µM) immediately turned from purple red to yellow and the red fluorescence was quenched obviously when a certain amount of Cu2+ was added, which enabled a dual-channel detection of Cu2+. A paper strip pre-stained with BT solution was further fabricated and it also showed excellent sensing ability toward Cu2+ with a detection limit as low as 10-6 M with the naked eye, which represents better portability and operation simplicity that is favourable for on-site analysis of Cu2+ in water.

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