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An Aptamer-based Sensor for Unchelated Gadolinium(III)

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A new fluorescent chemosensor for Hg2+ in aqueous solution.

Duong Tuan Quang¹, Nguyen Van Hop, Nguyen Dinh Luyen

¹Department of Chemistry, Hue University, Hue, Vietnam. duongtuanquang@dhsphue.edu.vn

Luminescence : the Journal of Biological and Chemical Luminescence

|April 19, 2012

Summary

A novel fluorescent chemosensor, DA, selectively detects mercury ions (Hg2+) in aqueous solutions. This Schiff base exhibits fluorescence enhancement upon initial Hg2+ addition, followed by quenching with excess mercury, demonstrating high selectivity over other metal ions.

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Area of Science:

Analytical Chemistry
Environmental Science
Materials Science

Background:

Mercury ions (Hg2+) pose significant environmental and health risks due to their toxicity.
Developing selective and sensitive detection methods for Hg2+ is crucial for environmental monitoring and public health.
Fluorescent chemosensors offer advantages such as high sensitivity, rapid response, and visual detection capabilities.

Purpose of the Study:

To synthesize and characterize an aminothiourea-derived Schiff base (DA).
To evaluate the efficacy of DA as a selective fluorescent chemosensor for Hg2+ ions.
To investigate the sensing mechanism and selectivity of DA towards Hg2+ in aqueous media.

Main Methods:

Synthesis of the Schiff base (DA) from aminothiourea.
Spectroscopic analysis (UV-Vis absorption and fluorescence spectroscopy) to study the interaction of DA with Hg2+.
Testing the selectivity of DA against various competing metal ions (Pb2+, Cd2+, Cr3+, Zn2+, Fe2+, Co3+, Ni2+, Ca2+, Mg2+, K+, Na+).

Main Results:

The Schiff base (DA) was successfully prepared.
DA exhibited a distinct fluorescence enhancement upon addition of 1 equivalent of Hg2+ ions in aqueous solution.
Further addition of Hg2+ ions led to a gradual fluorescence quenching.
DA demonstrated high selectivity for Hg2+ ions, with no significant fluorescence changes observed in the presence of other common metal ions.

Conclusions:

The synthesized Schiff base (DA) functions as an effective fluorescent chemosensor for Hg2+.
DA shows excellent selectivity and sensitivity for detecting Hg2+ in aqueous environments.
This sensor holds promise for practical applications in environmental monitoring and the detection of mercury contamination.