Cui T, Yu S, Chen Z, Liao R, Zhang X, Zhao Q, Sun H, Huang W. Rational design of fluorescent probe for Hg2+ by changing the chemical bond type.
RSC Adv 2018;
8:12276-12281. [PMID:
35539380 PMCID:
PMC9079269 DOI:
10.1039/c8ra00295a]
[Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2018] [Accepted: 03/18/2018] [Indexed: 01/07/2023] Open
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
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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.
Two kinds of fluorescent probes for Hg2+ with different detection mechanism have been realized by simply changing the chemical bond.![]()
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