Issue 39, 2020

High fluorescence LaOBr/coumarin organic–inorganic composite nanomaterials for ultra-sensitive Fe3+ sensing, fluorescence imaging and water-based ink anti-counterfeiting applications

Abstract

The detection of metal ions such as Fe3+ ions at the cellular level is of vital importance for monitoring life activities and disease diagnosis. Coumarin-based molecules are uniquely selective fluorescence probes for detecting Fe3+ ions; however, due to their lower water solubility, applying them in biological detection is a bottleneck problem. Herein, a centrally hydrophobic/externally hydrophilic strategy is proposed and a novel coumarin-based fluorescence probe was successfully synthesized by using LaOBr via a nucleophilic substitution reaction. The hydrophobic part of each coumarin molecule faces inward, and the hydrophilic part (iron-ion-capturing group) faces outward, allowing each coumarin molecule to be fully stretched. Compared with the coumarin-based N-[2-hydroxy-1,1-bis(hydroxymethyl)ethyl]-7-hydroxycoumarin-3-carboxamide (DAT) solution, the water solubility of the LaOBr/DAT composite solution was greatly improved, with enhanced fluorescent properties and detection performance. In a water solvent, the detection limit of the composite considerably improved from 300 nM to 440 pM, and the composite demonstrated better stability and selectivity for detecting Fe3+. The composite probe was applied in Fe3+ detection at the cellular level and in invisible anti-counterfeiting. This material design is of universal significance for improving the performance of other organic molecules.

Graphical abstract: High fluorescence LaOBr/coumarin organic–inorganic composite nanomaterials for ultra-sensitive Fe3+ sensing, fluorescence imaging and water-based ink anti-counterfeiting applications

Supplementary files

Article information

Article type
Paper
Submitted
16 Jul 2020
Accepted
09 Sep 2020
First published
11 Sep 2020

J. Mater. Chem. C, 2020,8, 13733-13742

High fluorescence LaOBr/coumarin organic–inorganic composite nanomaterials for ultra-sensitive Fe3+ sensing, fluorescence imaging and water-based ink anti-counterfeiting applications

L. Sun, J. Liu, S. Xu, B. Dong, J. Lv, S. Hu, B. Zhou, B. Shen, Y. Wang, L. Xu, W. Xu, X. Bai and H. Song, J. Mater. Chem. C, 2020, 8, 13733 DOI: 10.1039/D0TC03354E

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