title: A ratiometric fluorescent chemodosimeter for Cu(II) in water with high selectivity and sensitivity.
abstract: Coumarin derivative 1 was synthesized as an efficient ratiometric chemodosimeter for the detection of Cu(II) in 99% water/DMSO (v/v) at pH 7.0. Mechanism studies suggested that 1 formed a complex with Cu(II) at 2:1 ratio accompanied by quenching of green fluorescence at 524 nm; when the solution was heated to 50°C for 30 min, Cu(II)-promoted hydrolysis of coumarin lactone moiety of 1 occurred with bright blue fluorescence at 451 nm emerged. With fluorescence intensity ratio detection at 451 nm and 524 nm, 1 features an excellent sensitivity with the detection limit of 15 nmol L(-1) toward Cu(II) and a good selectivity over other metal ions.
authors.affiliation: Department of Chemistry, Tsinghua University, Beijing, China.
authors.forename: Kai
authors.initials: K
authors.lastname: Li
authors.forename: Na
authors.initials: N
authors.lastname: Li
authors.forename: Xiaotong
authors.initials: X
authors.lastname: Chen
authors.forename: Aijun
authors.initials: A
authors.lastname: Tong