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A triazole Schiff base-based selective and sensitive fluorescent probe for Zn²⁺: A combined experimental and
Caixia Yuan1, Xinyu Liu1, Yanbo Wu1
1Institute of Molecular Science, Key Laboratory of Materials for Energy Conversion and Storage of Shanxi Province, Key Laboratory of Chemical Biology and Molecular Engineering of the Education Ministry, Shanxi University, Taiyuan, Shanxi 030006, PR China.
Abstract:
A triazole-Schiff base, 4-(5-Chloro-2-hydroxybenzylideneamino)-1H-1,2,4-triazole-5(4H)-thione (HL), exhibits the high selectivity and sensitivity for Zn(2+) in the fluorescence spectrometry over other common metal ions, especially Cd(2+) in DMSO:H2O (1:9, v/v) solution. A 1:1 binding ratio of Zn(2+)/L for the complex has been obtained by Uv-Vis titration experiments and Job's plot with the detection limit of 51 nmol/L. The coordination mode of the complex in solution was further confirmed by density functional theory (DFT) calculations. Time-dependent density functional theory (TD-DFT) calculations indicate that a chelation-enhanced fluorescence (CHEF) effect occurs in the process of detecting Zn ion.
