A reversible “turn-on” fluorescent sensor for selective detection of Zn^sup 2

A novel Schiff-base oxime sensor H2L with the ONON chelating moieties was designed and synthesized based on condensation reaction. Different methods such as elemental analyses, FT-IR, 1H and 13C NMR were fully utilized in characterizing the structure of sensor H2L. The UV–vis spectra of the Zn2+ com...

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Bibliographic Details
Published in:Sensors and actuators. B, Chemical Chemical, 2017-01, Vol.238, p.723
Main Authors: Dong, Wen-Kui, Akogun, Sunday Folaranmi, Zhang, Yang, Sun, Yin-Xia, Dong, Xiu-Yan
Format: Article
Language:English
Subjects:
Binding
Charge transfer
Chelation
Chemical synthesis
Condensation
Crystal structure
Crystallography
Fluorescence
NMR
Nuclear magnetic resonance
Organic chemistry
Sensors
Zinc
Online Access:Get full text
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Summary:A novel Schiff-base oxime sensor H2L with the ONON chelating moieties was designed and synthesized based on condensation reaction. Different methods such as elemental analyses, FT-IR, 1H and 13C NMR were fully utilized in characterizing the structure of sensor H2L. The UV–vis spectra of the Zn2+ complex exhibit four clear isosbestic points which may be assigned to the ONON moieties binding to Zn2+. Sensor H2L operates on the CHEF and PET mechanisms, and the tendency of Zn2+ to strongly enhance fluorescence of sensor H2L was explored. Fluorescence measurements show that sensor H2L has excellent fluorescent selectivity for Zn2+ over many other metal ions based on intramolecular charge-transfer, and the results demonstrate that the binding between sensor H2L and Zn2+ is chemically reversible. The crystal structure of the Zn2+ complex has been characterized by X-ray crystallography.
ISSN:0925-4005
1873-3077