Abstract
A new colorimetric chemosensor 1, containing the 7-nitrobenzo-2-oxo-1,3-diazolyl (NBD) moiety and the phenol one connected through Schiff-base linkage, has been synthesized. Sensor 1 showed remarkable color changes from pink to orange and pale brown, respectively, upon selective binding to Ni2+ and Cu2+ that can be identified by the naked-eye. The binding modes of sensor 1 to Ni2+ and Cu2+ were determined to be 1:1 stoichiometries using a Job plot and ESI-mass analysis. The sensor 1 showed high sensitivity toward Ni2+ and Cu2+ with the detection limits of 0.48μM and 0.26μM, respectively. The recognition properties of the sensor 1 toward Ni2+ and Cu2+ were explained by using photophysical experiments and theoretical calculations. Practically, sensor 1 functioned as a visible test strip for Ni2+ and Cu2+.
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