Issue 22, 2018, Issue in Progress

Rational design of fluorescent probe for Hg2+ by changing the chemical bond type

Abstract

Two kinds of fluorescent probes DFBT and DFABT, and their corresponding water-soluble compounds WDFBT and WDFABT, based on the trimers containing a benzo[2,1,3]thiadiazole moiety and two fluorene moieties are synthesized. Their luminescent behavior towards Hg2+ ions and other various metal ions in organic and water solutions are studied in detail via absorption and emission spectroscopy. All these probes show a selective “on–off-type” fluorescent response to Hg2+ ions in solution over other metal ions with a maximum detection limit of 10−7 M. Importantly, the probe type can be changed from irreversible to reversible by altering the bridge mode between the functional units from C[triple bond, length as m-dash]C triple bond to C–C single bond. Their detection mechanisms towards Hg2+ are studied in detail via mass spectrometry and Job plots, which are attributed to irreversible chemical reaction for DFABT and WDFABT and a reversible coordination reaction for DFBT and WDFBT respectively. Our research results about this kind of organic fluorescent probe provide valuable information to the future design of practical Hg2+ fluorescent probes.

Graphical abstract: Rational design of fluorescent probe for Hg2+ by changing the chemical bond type

Supplementary files

Article information

Article type
Paper
Submitted
11 Jan 2018
Accepted
18 Mar 2018
First published
29 Mar 2018
This article is Open Access
Creative Commons BY license

RSC Adv., 2018,8, 12276-12281

Rational design of fluorescent probe for Hg2+ by changing the chemical bond type

T. Cui, S. Yu, Z. Chen, R. Liao, X. Zhang, Q. Zhao, H. Sun and W. Huang, RSC Adv., 2018, 8, 12276 DOI: 10.1039/C8RA00295A

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