title: A mechanosynthesized, sequential, cyclic fluorescent probe for mercury and iodide ions in aqueous solutions.
abstract: A fluorescent Hg(2+)-selective chemosensor, 2,5-dimethoxybenzaldehyde thiosemicarbazone (1), was quantitatively prepared by grinding 2,5-dimethoxybenzaldehyde and thiosemicarbazide together in a ball mill for 15min. The excitation and emission maxima of compound 1 are 347 and 450nm, respectively. The reaction of this ligand with Hg(2+) was investigated by FT-IR, (1)H NMR, and fluorescence titration. Results show that the composition of the resulting Hg complex 1-Hg is 2:1 1:Hg, and that the S and imino N atoms serve as the binding sites of the ligand to the Hg(2+) ions. Coordination-assisted fluorescence quenching results show that compound 1 exhibits a highly selective fluorescence response to trace amounts of Hg(2+) in water. More importantly, the resulting complex 1-Hg can be used as a turn-on fluorescence probe for I(-) at a detection limit of 8.4×10(-8)M. Thus, compound 1 is a relatively stable, sequential, cyclic fluorescent probe for Hg(2+) and I(-).
authors.affiliation: Key Laboratory of Tropical Biological Resources of the Ministry of Education, Department of Chemical Engineering, Hainan University, 58 Renmin Road, Haikou 570228, China.
authors.forename: Shangwen
authors.initials: S
authors.lastname: Chen
authors.affiliation: Key Laboratory of Tropical Biological Resources of the Ministry of Education, Department of Chemical Engineering, Hainan University, 58 Renmin Road, Haikou 570228, China.
authors.forename: Pipi
authors.initials: P
authors.lastname: Wang
authors.affiliation: Key Laboratory of Tropical Biological Resources of the Ministry of Education, Department of Chemical Engineering, Hainan University, 58 Renmin Road, Haikou 570228, China.
authors.forename: Chunmei
authors.initials: C
authors.lastname: Jia
authors.affiliation: School of Chemistry and Chemical Engineering, Hainan Normal University, 99 Longkun South Road, Haikou 571158, China. Electronic address: linqiang@hainnu.edu.cn.
authors.forename: Qiang
authors.initials: Q
authors.lastname: Lin
authors.affiliation: Key Laboratory of Tropical Biological Resources of the Ministry of Education, Department of Chemical Engineering, Hainan University, 58 Renmin Road, Haikou 570228, China; School of Chemistry and Chemical Engineering, Hainan Normal University, 99 Longkun South Road, Haikou 571158, China. Electronic address: wbyuan@hainu.edu.cn.
authors.forename: Wenbing
authors.initials: W
authors.lastname: Yuan
mesh_terms: D005456:Fluorescent Dyes / Q000138:chemical synthesis / Q000737:chemistry*; D007454:Iodides / Q000032:analysis*; D057230:Limit of Detection; D008628:Mercury / Q000032:analysis*; D013050:Spectrometry, Fluorescence / Q000379:methods; D013882:Thiosemicarbazones / Q000138:chemical synthesis / Q000737:chemistry*; D014867:Water / Q000032:analysis; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D005456:Fluorescent Dyes; D007454:Iodides; D013882:Thiosemicarbazones; D014874:Water Pollutants, Chemical; D014867:Water; D008628:Mercury
keywords: Fluorescence probe; Iodide; Mechanochemical reaction; Mercury