Abstract
Several acylthioureas have been synthesized to develop colorimetric sensors for detection of biologically important anions. UV–vis titration experiments indicated that the absorbance values have a good linear relationship with concentration of anions when the anions were added in AR-1, AR-4 and AR-6 sensor molecules. The detection limit to AcO− and F− is 5×10−6mol/L when the concentration of receptors are 2×10−5mol/L. Especially, compounds AR-1 and AR-4, decorated with strong electron-withdrawing NO2 substituent, showed augmented anion sensing properties, being capable of naked-eye detecting of F− and AcO− when the water content is lower than 15%. The recognition details of anion sensing were also assessed using 1H NMR technique and confirmed that the basic anions induced deprotonation of N–H.
Published Version
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