title: A simple Schiff base fluorescence probe for highly sensitive and selective detection of Hg(2+)and Cu(2.).
abstract: A new Schiff base fluorescent probe, 2-(4-(diphenylamine)benzylidene) thiosemicarbazide (DPBT), was synthesized and its sensing behavior to metal ions were studied by UV-vis and fluorescence spectra. The results show that DPBT can detect Hg(2+)sensitively and selectively in weakly acidic and neutral conditions, they form a complex with 2:1. The linear range was 0.095-1.14µM and the detection limit was 0.15nM. In weakly alkaline conditions, DPBT can interaction with Hg(2+)and Cu(2+)at the same time. We use "masking" reagent, NaBH4, to reduce Hg(2+)to Hg°, the detection of Cu(2+)were achieved. They formed 1:1 complex with the binding constant of 4×10(4)M(-1), a good linear relationship in 0.45-3.6µM and the detection limit of 0.17µM. The proposed method was used to determine Hg(2+)and Cu(2+)in tap water and waste water samples.
authors.affiliation: School of Chemistry and Chemical Engineering, Center of Environmental Science Research, Shanxi University, Taiyuan 030006, PR China. Electronic address: chzhang@sxu.edu.cn.
authors.forename: Caihong
authors.initials: C
authors.lastname: Zhang
authors.affiliation: School of Chemistry and Chemical Engineering, Center of Environmental Science Research, Shanxi University, Taiyuan 030006, PR China.
authors.forename: Baozhen
authors.initials: B
authors.lastname: Gao
authors.affiliation: School of Chemistry and Chemical Engineering, Center of Environmental Science Research, Shanxi University, Taiyuan 030006, PR China.
authors.forename: Qingyan
authors.initials: Q
authors.lastname: Zhang
authors.affiliation: School of Chemistry and Chemical Engineering, Center of Environmental Science Research, Shanxi University, Taiyuan 030006, PR China.
authors.forename: Guomei
authors.initials: G
authors.lastname: Zhang
authors.affiliation: School of Chemistry and Chemical Engineering, Center of Environmental Science Research, Shanxi University, Taiyuan 030006, PR China.
authors.forename: Shaomin
authors.initials: S
authors.lastname: Shuang
authors.affiliation: School of Chemistry and Chemical Engineering, Center of Environmental Science Research, Shanxi University, Taiyuan 030006, PR China. Electronic address: dc@sxu.edu.cn.
authors.forename: Chuan
authors.initials: C
authors.lastname: Dong
keywords: Detection; Fluorescent probe; Hg(2+)and Cu(2+); Metal ions; “Masking” reagent