title: A novel 5-mercapto triazole Schiff base as a selective chromogenic chemosensor for Cu2+.
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.
authors.affiliation: Key Laboratory of Eco-Environment-Related Polymer Materials, Ministry of Education of China, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou, Gansu 730070, PR China.
authors.forename: Ming-Xia
authors.initials: MX
authors.lastname: Liu
authors.forename: Tai-Bao
authors.initials: TB
authors.lastname: Wei
authors.forename: Qi
authors.initials: Q
authors.lastname: Lin
authors.forename: You-Ming
authors.initials: YM
authors.lastname: Zhang
mesh_terms: D015374:Biosensing Techniques; D002412:Cations / Q000737:chemistry*; D002863:Chromogenic Compounds / Q000737:chemistry*; D003124:Colorimetry; D003300:Copper / Q000737:chemistry*; D057230:Limit of Detection; D010636:Phenols / Q000737:chemistry; D012545:Schiff Bases / Q000737:chemistry*; D013439:Sulfhydryl Reagents / Q000737:chemistry; D014230:Triazoles / Q000737:chemistry*
chemical_list: D002412:Cations; D002863:Chromogenic Compounds; D010636:Phenols; D012545:Schiff Bases; D013439:Sulfhydryl Reagents; D014230:Triazoles; D003300:Copper