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A novel fluoride ion colorimetric chemosensor based on coumarin.

Xiaoqing Zhuang¹, Weimin Liu, Jiasheng Wu

¹Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, PR China.

Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy

|June 22, 2011

Summary

A new coumarin-based sensor (L1) detects fluoride ions with a distinct color change from yellow to blue. This highly selective sensor shows no interference from other common anions.

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Area of Science:

Analytical Chemistry
Organic Chemistry
Materials Science

Background:

Fluoride ion detection is crucial in environmental monitoring and biological systems.
Existing sensors often lack selectivity or require complex instrumentation.
Coumarin derivatives offer promising platforms for developing novel chemosensors.

Purpose of the Study:

To synthesize and characterize a novel coumarin-based colorimetric sensor (L1) for selective fluoride ion detection.
To investigate the sensing mechanism and performance of the sensor in acetonitrile.
To evaluate the sensor's selectivity against common interfering anions.

Main Methods:

Synthesis of the coumarin-based chemosensor (L1).
Colorimetric analysis of L1 upon addition of fluoride ions in acetonitrile.
Spectroscopic studies, including 1H NMR titration, to elucidate the sensing mechanism.
Testing the selectivity of L1 against various anions (Cl-, Br-, I-, NO3-, H2PO4-, HSO4-, AcO-).

Main Results:

The synthesized sensor L1 exhibited a distinct color change from yellow to blue in the presence of fluoride ions.
A significant red shift of 145 nm was observed in the absorption spectrum upon fluoride binding.
The sensor demonstrated high selectivity for fluoride ions, with no interference observed from other tested anions.
1H NMR titration studies indicated a mechanism involving hydrogen bonding and subsequent deprotonation induced by the formation of [F-H-F]-.

Conclusions:

The novel coumarin-based sensor L1 provides a simple, visible, and highly selective method for fluoride ion detection.
The observed colorimetric response and selectivity make L1 a promising candidate for practical applications in fluoride sensing.
The proposed mechanism involving hydrogen bonding and deprotonation offers insight into the sensor's operation.