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  • Title: A novel 5-mercapto triazole Schiff base as a selective chromogenic chemosensor for Cu2+.
    Author: Liu MX, Wei TB, Lin Q, Zhang YM.
    Journal: Spectrochim Acta A Mol Biomol Spectrosc; 2011 Sep; 79(5):1837-42. PubMed ID: 21689970.
    Abstract:
    A novel colorimetric cation sensor bearing phenol, thiol and HCN groups was designed and synthesized. In a DMSO/H2O (9:1, v/v) solution, the sensor exhibited highly selective recognition of Cu2+ among a range of metal ions tested. In the presence of Cu2+, solutions of the sensor underwent a dramatic color change from colorless to yellow, while the presence of other metal cations such as Zn2+, Pb2+, Cd2+, Ni2+, Co2+, Fe3+, Hg2+, Ag+ and Ca2+ had no effect on the color. The detection limit of the sensor toward Cu2+ is 8.0×10(-7) M and an association constant Ka of 4.3×10(5) M(-1) was measured. The sensing of Cu2+ by this sensor was found to be reversible, with the Cu2+-induced color being lost upon addition of EDTA.
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