An In-MOF Multiresponsive Fluorescent Sensor for Highly Sensitive Aqueous-phase Detection of Nitroaromatic Explosives, Fe³⁺ and Cr₂O₇²⁻

Abstract

Developing a single platform capable of detecting chemically diverse pollutants in water remains challenging. Herein, we report a water-stable indium-organic framework, JLU-MOF234, constructed from 5-(3-carboxyphenyl)pyridine-2-carboxylic acid, which exhibits strong intrinsic fluorescence and excellent hydrolytic stability. Owing to its rigid coordination architecture and electron-rich conjugated ligand, JLU-MOF234 functions as a highly sensitive, multiresponsive fluorescent sensor capable of detecting Fe³⁺ ions, dichromate anions (Cr₂O₇²⁻), and nitroaromatic explosives in aqueous media. The framework demonstrates pronounced fluorescence quenching toward all three classes of pollutants, with high selectivity and low detection limits. This study highlights JLU-MOF234 as a versatile “all-in-one” luminescent platform for comprehensive environmental monitoring of chemically diverse contaminants.

Keywords

Indium metal-organic framework / Fluorescence sensing / Fluorescent detection

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RIGHTS & PERMISSIONS

Jilin University, The Editorial Department of Chemical Research in Chinese Universities and Springer-Verlag GmbH