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Oxolinic Acid Generated Green Fluorescence Based on a Terbium-Functionalized Covalent Organic Framework.

Qianqian Jin¹, Yuzhen Hou², Dandan Zhu¹

¹College of Chemistry, Chemical Engineering and Materials Science, Zaozhuang University, Zaozhuang 277160, China.

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Summary

A new terbium(III)-functionalized covalent organic framework (Bpy-DhBt-COF@Tb³⁺) offers a highly sensitive and selective turn-on fluorescent sensor for detecting the environmental contaminant oxolinic acid (OXO). This rapid detection method shows significant promise for environmental monitoring.

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Area of Science:

Environmental Chemistry
Materials Science
Analytical Chemistry

Background:

Oxolinic acid (OXO) is a persistent environmental contaminant with adverse health effects.
Efficient and sensitive detection methods for OXO are crucial for environmental safety.
Covalent organic frameworks (COFs) offer unique properties for material functionalization.

Purpose of the Study:

To develop a novel turn-on fluorescent sensor for the detection of oxolinic acid (OXO).
To utilize a terbium(III)-functionalized covalent organic framework (Bpy-DhBt-COF@Tb³⁺) for this purpose.
To achieve rapid response, high sensitivity, and excellent selectivity in OXO detection.

Main Methods:

Synthesis of a bipyridine-connecting COF (Bpy-DhBt-COF).
Functionalization of the COF with terbium(III) ions (Tb³⁺) to create Bpy-DhBt-COF@Tb³⁺.
Investigation of the fluorescence response of Bpy-DhBt-COF@Tb³⁺ upon introduction of OXO.

Main Results:

The Bpy-DhBt-COF@Tb³⁺ platform demonstrated a turn-on fluorescence response to OXO.
Achieved an ultrasensitive detection limit of 12.5 nM for OXO within 10 seconds.
Exhibited outstanding selectivity for OXO over other quinolone compounds.

Conclusions:

A novel Tb³⁺-functionalized COF serves as an effective turn-on fluorescent sensor for OXO.
The sensor offers rapid response, high sensitivity, and excellent selectivity.
This strategy provides a promising approach for developing fluorescent sensors for various targets.