Abstract
Due to the advantages of high selectivity, accuracy and mutual calibration, dual-channel sensors have drawn much attention. In this work, a water-soluble fluorescence and colorimetric dual-channel chemosensor (AAT) with both azomonardine and aminothiazole units has been designed and synthesized. ArOH and N groups, which respectively belonged to azomonardine and thiazole unit, exhibited pH dependent ionization, which leaded AAT exhibiting strong naked-eye visible fluorescence and color in acidic and alkaline solution, respectively. When N was ionized in acidic solution, fluorescence was turned on. The colorimetry occurred while the ionization of Ar−OH in alkaline solution. Moreover, the solution pH had a significant impact on the binding efficiency between AAT and Hg2+, resulted in different coordination manners and stoichiometry. At pH 5.0, in the fluorescence channel, the stoichiometry of AAT for Hg2+ was calculated as 1:2 and the linear detection concentration was ranged from 0 to 35 μM. It was in a range of 0–12 μM through colorimetric method with the stoichiometry of 1:1 at pH 7.5. Furthermore, neither in fluorescence or in colorimetric channel, AAT showed high specificity toward Hg2+ among numerous cationic and anion ions. Also, AAT realized the Hg2+ identification and determination in river water samples.
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