Add time:08/30/2019         Source:sciencedirect.com

Herein, we have developed a simple, environment friendly fluorescent turn-off and colorimetric sensor for the rapid detection of Cu2+ ions in aqueous solution by using organic Schiff base ligand benzildihydrazone-N,N'-bis(2-hydroxy-4-diethylamino-1-formylbenzene) (L). Binding interaction between L and various metal ions was established by UV–vis and fluorescent measurements showing favourable coordination towards Cu2+ and almost no interference with the other metal ions, i.e., Na+, Ba2+, Fe3+, Co2+, Ni2+, Zn2+, Cd2+, Ca2+, Hg2+, Pb2+,Cr3+, Ag+ and Al3+. L exhibited binding-induced colour change from yellow to light red. The obtained L-Cu2+ complex could be used as a new cascade sensor for detecting cyanide anion (CN−). The corresponding detection limits were found to be 7.3 × 10−10 M for Cu2+ (lowest ever known in the family of fluorescent colorimetric Schiff base chemo-sensor) and 1.5 × 10−7 M for CN−. To further assess the analytical performance of this sensing system, the concentrations of Cu2+ and CN−1 ions were determined in real water samples and simulated urine sample.

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