Abstract
A simple colorimetric receptor 1 based on the combination of N-(5-nitro-2-pyridyl)-1,2-ethanediamine and 4-(diethylamino)-2-hydroxybenzaldehyde was synthesized for the sequential detection of Cu2+ and CN−. The receptor 1 showed a distinct color change toward Cu2+ from colorless to yellow. The detection limit of 1 for Cu2+ (0.88μM) was much lower than the World Health Organization guideline (31.5μM) as the maximum allowable copper concentration in drinking water. In addition, 1-Cu2+ complex could be used to detect cyanide by showing a color change from yellow to colorless, indicating the recovery of 1 from 1-Cu2+. Furthermore, the sensing mechanism of 1 for Cu2+ was supported by theoretical calculations.
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