Qing Huang, Qiao Li, Hai-Li Zhang
Nov 11, 2021
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Journal
Canadian Journal of Chemistry
Abstract
We synthesize and develop 1,3-dihydro-2H-imidazo[4,5-b]phenazine-2-thione as a ratiometric chemosensor for recognition of Hg2+ in DMSO/H2O (v/v = 9:1) binary solution. We rationally introduce the phenazine imidazole group as fluorophore and the thione moiety as recognition site to bind Hg2+. Interestingly, the chemosensor shows ultrasensitive response for Hg2+ and the lowest limit of detection is 0.167 nM. In addition, it can also separate Hg2+ from aqueous solution with excellent ingestion capacity, and the adsorption ratio is up to 96%. Furthermore, ion test strips based on the chemosensor are fabricated to conveniently and efficiently detect Hg2+.