title: Highly sensitive and selective determination of cupric ions by using N,N'-bis(salicylidene)-o-phenylenediamine as fluorescent chemosensor and related applications.
abstract: A sensitive and selective copper(II) fluorescence Schiff base chemical sensor receptor 1 (short for N,N'-bis(salicylidene)-o-phenylenediamine) has been prepared. The fluorescence of receptor 1 in pH 8.2 phosphate buffer solution can be dramatically quenched by Cu(2+), whereas it is nearly unaffected by other metal ions. Based on this, a sensitive and selective fluorescent quenching method for Cu(2+) detection has been established. Under the optimum conditions, a good linear relation exists between the quenching efficiency (F0/F) and the concentration of Cu(2+) in the range of 1.0 × 10(-7)-2.5 × 10(-6) mol L(-1). The detection limit (3σ) for Cu(2+) determination is 2.0 × 10(-8) mol L(-1). The present method has been successfully used for quantification of Cu(2+) in soybean milk powder. Furthermore, the fluorescence switch property of the system was explored, and the system might be applied for determination of glutathione and construction of molecular logic gate.
authors.affiliation: School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
authors.forename: Biyun
authors.initials: B
authors.lastname: Fang
authors.affiliation: School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Liang
authors.affiliation: School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China. Electronic address: fchen@mail.hust.edu.cn.
authors.forename: Fang
authors.initials: F
authors.lastname: Chen
mesh_terms: D002138:Calibration; D003300:Copper / Q000032:analysis*; D005456:Fluorescent Dyes / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D057230:Limit of Detection; D012459:Salicylates / Q000737:chemistry*; D013057:Spectrum Analysis / Q000379:methods*
chemical_list: D005456:Fluorescent Dyes; D012459:Salicylates; C090416:salophen; D003300:Copper
keywords: Copper ions; Fluorescence quenching; Fluorescence switch; N,N′-bis(salicylidene)-o-phenylenediamine