Abstract
A novel colorimetric cation sensor bearing phenol, thiol and HC N groups was designed and synthesized. In a DMSO/H 2O (9:1, v/v) solution, the sensor exhibited highly selective recognition of Cu 2+ among a range of metal ions tested. In the presence of Cu 2+, solutions of the sensor underwent a dramatic color change from colorless to yellow, while the presence of other metal cations such as Zn 2+, Pb 2+, Cd 2+, Ni 2+, Co 2+, Fe 3+, Hg 2+, Ag + and Ca 2+ had no effect on the color. The detection limit of the sensor toward Cu 2+ is 8.0 × 10 −7 M and an association constant K a of 4.3 × 10 5 M −1 was measured. The sensing of Cu 2+ by this sensor was found to be reversible, with the Cu 2+-induced color being lost upon addition of EDTA.
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