Recyclable fluorescent chemodosimeters based on 8-hydroxyquinoline derivatives for highly sensitive and selective detection of mercury(II) in aqueous media and test strips

Jingwen Xiong; Zongzhi Li; Shaomin Ji; Chengqiang Pan; Wenjin Ji; Qi Li; Yanping Huo

doi:10.1016/j.saa.2019.04.004

Recyclable fluorescent chemodosimeters based on 8-hydroxyquinoline derivatives for highly sensitive and selective detection of mercury(II) in aqueous media and test strips

Spectrochim Acta A Mol Biomol Spectrosc. 2019 Jul 5:218:196-205. doi: 10.1016/j.saa.2019.04.004. Epub 2019 Apr 4.

Authors

Jingwen Xiong¹, Zongzhi Li¹, Shaomin Ji², Chengqiang Pan¹, Wenjin Ji¹, Qi Li¹, Yanping Huo³

Affiliations

¹ School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, China.
² School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, China. Electronic address: smji@gdut.edu.cn.
³ School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, China. Electronic address: yphuo@gdut.edu.cn.

PMID: 30995577
DOI: 10.1016/j.saa.2019.04.004

Abstract

Four novel highly selective 8-hydroxyquinoline-based fluorescent chemodosimeters (1-4) were synthesized for the rapid analysis of Hg²⁺ in aqueous solution and on paper strips, which probably attributed to the excited state intramolecular proton transfer (ESIPT) process. Chemodosimeter 1 was evaluated as a Hg²⁺-ratiometric fluorescent sensor while others (2, 3 and 4) displayed fluorescence turn-on response for Hg²⁺ among the various survey metal ions. We demonstrated that chemodosimeters (1-4) could recognized Hg²⁺ ions based on a 1:1 stoichiometric binding event with fast detection time. More importantly, the detection limits for Hg²⁺ could reach at 10^-9 M level except chemodosimeter 1 (4.05 × 10^-8 M). In addition, it was found that chemodosimeters (1-4) were recycled efficiently because the Hg²⁺ induced emission spectra were reversed after adding NaBH₄. Finally, these four sensors were successfully applied for fabrication of simple device test strips for rapid and on-site detection of Hg²⁺ ions.

Keywords: Fluorescent chemodosimeters; Ratiometric; Recyclable; Turn-on.