A Robust Zn-based Coordination Polymer for Ultra-sensitive and Selective Detection of Trace 2,4,6-Trinitrophenol and Fe³⁺ in Aqueous Solution

Abstract

A novel Zn-based luminescent coordination polymer [Zn(phen)(H₂O)]₂[L]·2H₂O (1), [H₄L=(E)-5,5′-(diazene-1,2-diyl) diisophthalic acid] was synthesized via a solvothermal reaction, which has a three-dimensional supramolecular structure. Compound 1 exhibits good chemical and thermal stability, and can effectively detect nitroaromatic explosives (NACs) via a fluorescence quenching effect. Especially for 2,4,6-trinitrophenol, compound 1 has demonstrated very high sensitivity (K_SV=1.9×10⁴ L/mol), low detection limit (LOD=9.6×10⁻⁶ mol/L) and good anti-interference ability. Additionally, Compound 1 also exhibits good selective recognition of Fe³⁺ with excellent anti-interference performance and reusability. Through UV-visible spectroscopy and density functional theory calculations, the fluorescence quenching mechanisms of compound 1 for various analytes are discussed in detail. Based on the above excellent properties of compound 1, it has great application potential in water quality monitoring.

Keywords

Coordination polymer / Crystal structure / Fluorescent probe / 2,4,6-Trinitrophenol / Fe³⁺

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RIGHTS & PERMISSIONS

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