Spectroscopic and theoretical studies on a novel bis(salamo)-like probe for highly effective fluorimetric-colorimetric identification of Fe3+ and Cu2+ in aquo-organic medium

Ya-Ting La; Ming-Xia Du; Lu-Lu Gan; Yang Zhang; Yin-Xia Sun; Wen-Kui Dong

doi:10.1016/j.saa.2023.123481

Spectroscopic and theoretical studies on a novel bis(salamo)-like probe for highly effective fluorimetric-colorimetric identification of Fe³⁺ and Cu²⁺ in aquo-organic medium

Spectrochim Acta A Mol Biomol Spectrosc. 2024 Jan 15:305:123481. doi: 10.1016/j.saa.2023.123481. Epub 2023 Oct 1.

Authors

Ya-Ting La¹, Ming-Xia Du¹, Lu-Lu Gan¹, Yang Zhang¹, Yin-Xia Sun¹, Wen-Kui Dong²

Affiliations

¹ School of Chemistry and Chemical Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China.
² School of Chemistry and Chemical Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China. Electronic address: dongwk@126.com.

PMID: 37804710
DOI: 10.1016/j.saa.2023.123481

Abstract

A novel bis(salamo)-type sensor FT for fluorescence-colorimetric recognition of Fe³⁺/Cu²⁺ has been created, which revealed significant fluorescent performance and colorimetric sensing ability for Cu²⁺ and Fe³⁺ ions, superior to other related competitive metal ions. Interestingly, the binding of the FT probe with Cu²⁺ ions manifested an instant color change from colorless to red in sunlight, which is detectable by the naked-eye, and a fluorescence turn-off response under UV light for Fe³⁺ and Cu²⁺. The results demonstrated that the probe exhibits better sensitivity, greater affinity and lower limit of detection leading to quick response time in an aquo-organic medium. The excited state property of the FT probe and in the presence of Cu²⁺/Fe³⁺ was evaluated on the basis of DFT & TD-DFT results. Furthermore, test strips have been provided for convenient monitoring of Cu²⁺ and Fe³⁺ ions by naked eye and fluorescence method.

Keywords: Fe(3+) & Cu(2+); Fluorescent chemical probe; Mechanism; Test strip; Theoretical computation.