Study on the fluorescent chemosensors based on a series of bis-Schiff bases for the detection of zinc(II).
In order to study the influence of different substituent groups on the fluorescence properties, a series of bis-Schiff bases (L) with electron-donating groups (salicylaldehyde, o-vanillin, 2,4-dihydroxybenzaldehyde) and electron-drawing group (4-formylbenzoic acid) have been synthesized, and characterized by IR spectrum, NMR, mass spectrum, and fluorescence spectroscopy. The investigation of the fluorescent properties reveals that the fluorescence can be enhanced when the bis-Schiff base ligands with electron-donating groups complex with Zn ion, while other kinds of metal complexes with these ligands do not show any enhancement, whereas no fluorescence enhancement can be observed when the ligand with electron-drawing group complexes with all different types of metal ions. In addition, as for the ligands with electron-donating groups detecting zinc ion, the fluorescence intensity is linear correlated with the concentration of zinc ion. Therefore, the study indicates that the ligands with electron-donating groups can be used as Zn ion fluorescent sensor.
Education Ministry Key Laboratory of Marine Chemistry Theory and Technology, Department of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China.
Wanguan
W
Wang
Qingdao Women and Children Hospital, Qingdao 266034, China.
Rong
R
Li
Education Ministry Key Laboratory of Marine Chemistry Theory and Technology, Department of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China.
Tianwen
T
Song
Education Ministry Key Laboratory of Marine Chemistry Theory and Technology, Department of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China.
Chunjiao
C
Zhang
Education Ministry Key Laboratory of Marine Chemistry Theory and Technology, Department of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China. Electronic address: ouczhaoyu@163.com.
Yu
Y
Zhao
Bis-Schiff base; Electron-donating group; Electron-drawing group; Fluorescent chemosensor; Zinc(II)