Abstract
In this paper, we demonstrate a new fluorescent turn-on chemodosimeter for Hg2+ determination. The chemodosimeter contains a triphenylimidazole fluorophore and an Hg2+-responsive dithioacetal moiety. In the presence of Hg2+, the probe displays a characteristic turn-on mode at 527nm in its emission spectrum due to the irreversible Hg2+-promoted deprotection of the dithioacetal group. With the aid of the fluorescence spectrometer, the chemodosimeter in the dimethylformamide/H2O (7/3, v/v) mixed solvent (2.0μM) exhibits a detection limit of 4.3nM (S/N=3). Interferences from other common cations associated with Hg2+ analysis are effectively inhibited.
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