Abstract
Based on the displacement strategy, a new and simple sulfide-selective chemosignaling system was devised using 1,4-dihydroxyanthraquinone (DHAQ)–Cu2+ ensemble. In aqueous solution containing 10% ethanol (HEPES buffer, pH7.4), DHAQ could give rise to a visible yellow-to-pink color change with the addition of Cu2+. The resulting pink solution changed to yellow upon subsequent addition of sulfide anion. Moreover, DHAQ displays an “ON–OFF–ON” mode fluorescence change with alternately added Cu2+ and S2−. Experimental results show a low interference response towards other common anions. The selective switch-on fluorescence response of the sensing ensemble to S2− makes it suitable for sensing of S2− in aqueous solution. The detection limit is 5.98 × 10−8 M.
Published Version
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