Abstract
A new selective and highly sensitive chemosensor based on the Schiff base 1-benzylidenethiosemicarbazide (KH1) was synthesized and applied for the Ag+ sensor in 4:1 dimethyl sulfoxide-water. Upon addition of Ag+, the fluorescence intensity of KH1was increased at 350 nm. The 1:1 stoichiometry of KH1 with Ag+ was confirmed by a spectrofluorimetric titration and a Job’s plot measurement. Parameters affecting the sensitivity such as pH, reaction time, ionic strength, and Schiff base concentration were optimized. Under the optimum conditions, KH1 gave a wide range of linearity from 1 to 110 µM and the limit of detection and relative standard deviation were 0.2 µM and 2.2%, respectively. In addition, the KH1 sensor was used to determine Ag+ in water samples with good precision and accuracy.
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