A novel colorimetric chemosensor for detection of Co2+ and S2- in an aqueous environment

作者：Ryu Ka Young; Lee Seong Youl; Park Dae Yul; Kim So Young; Kim Cheal^*

来源：Sensors and Actuators B: Chemical , 2017, 242: 792-800.

DOI：10.1016/j.snb.2016.09.180

• Cobalt ion
• Sulfide
• Colorimetric
• Naked-eye
• Theoretical calculations

A novel multifunctional and highly selective chemosensor 1, N 2-(bis(pyridin-2-ylmethyl)amino)-N-(2((2,4-dinitrophenyl)amino)phenyl)acetamide, for Co2+ and S2- was designed and synthesized. Sensor 1 showed a selective colorimetric sensing ability for cobalt ion by changing color from pale yellow to light green in a near perfect aqueous solution. The detection limit (0.99 mu M) of 1 for Co2+ was lower than the Environmental Protection Agency (EPA) guideline (1.7 mu M) for drinking water. The sensor I could be used to quantify Co2+ in water samples. Moreover, sensor 1 detected S2- selectively, which induced an obvious color change from pale yellow to pink over most other competitive anions in aqueous solution. The sensing mechanism of Co2+ by 1 was proposed to be a ligand-to-metal charge -transfer (LMCT) with the experimental results and theoretical calculations, and that of S2- by 1 proposed to be a deprotonation process. Therefore, this sensor 1 could be used as a practical system for monitoring both Co2+ and S2- in an aqueous environment.

• 出版日期2017-4