A mechanosynthesized, sequential, cyclic fluorescent probe for mercury and iodide ions in aqueous solutions

作者：Chen, Shangwen; Wang, Pipi; Jia, Chunmei; Lin, Qiang^*; Yuan, Wenbing

来源：Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy , 2014, 133: 223-228.

DOI：10.1016/j.saa.2014.05.067

• Fluorescence probe
• Mercury
• Iodide
• Mechanochemical reaction

A fluorescent Hg2+-selective chemosensor, 2,5-dimethoxybenzaldehyde thiosemicarbazone (1), was quantitatively prepared by grinding 2,5-dimethoxybenzaldehyde and thiosemicarbazide together in a ball mill for 15 min. The excitation and emission maxima of compound 1 are 347 and 450 nm, respectively. The reaction of this ligand with Hg2+ was investigated by FT-IR, H-1 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 Hg2+ ions. Coordination-assisted fluorescence quenching results show that compound 1 exhibits a highly selective fluorescence response to trace amounts of Hg2+ 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 x 10(-8) M. Thus, compound 1 is a relatively stable, sequential, cyclic fluorescent probe for Hg2+ and I-.

• 出版日期2014-12-10
• 单位海南师范大学; 海南大学