One-Dimensional Uranyl Carboxyphosphonate Coordination Polymer for Highly Sensitive and Selective Detection of Fe3+ ion in Aqueous Media

doi:10.7503/cjcu20250165

Abstract

Abstract:

A one-dimensional uranyl carboxyphosphonate coordination polymer，（UO₂）（2-pmbH₂）₂（1）， was synthesized from 2-pmbH₃ ligand and uranyl ions. In this structure， phosphonate groups bridge uranyl ions through two oxygen atoms to form one-dimensional chain， with protonated carboxyl groups and phosphonate oxygen atoms orderly distributed on both sides of the chain backbone. Interchain hydrogen-bond interactions form a supramolecular network. Furthermore， compound 1 exhibits high water stability（stable at pH=1—12） and good luminescent properties（quantum yield QY=14.1%）. Fluorescence analysis of compound 1 in various metal ion aqueous solutions revealed that only Fe³⁺ can induce >95% quenching efficiency for its strongest characteristic emission peak（λ_em=524 nm）， demonstrating remarkable selectivity. By establishing a quantitative relationship between Fe³⁺ concentration and fluorescence intensity of compound 1， the sensing material shows a good linear response（R²=0.99） in the low concentration range（0—0.04 mmol·L^-1） with a low detection limit（3.67×10^-7 mol/L）. Therefore， due to its unique molecular structure， good luminescent properties， high water stability， as well as its high selectivity and sensitive quenching response toward Fe³⁺ ions in aqueous solutions， compound 1 demonstrates great potential as a sensing material for the detection of metal ions.

Key words: Uranyl carboxyphosphonate coordination polymer, Luminescence, Fe³⁺, Metal ions detection

CLC Number:

O641

TrendMD:

WEN Gehua, XUE Jingyi. One-Dimensional Uranyl Carboxyphosphonate Coordination Polymer for Highly Sensitive and Selective Detection of Fe³⁺ ion in Aqueous Media[J]. Chem. J. Chinese Universities, 2025, 46(12): 20250165.

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References 35

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One-Dimensional Uranyl Carboxyphosphonate Coordination Polymer for Highly Sensitive and Selective Detection of Fe³⁺ ion in Aqueous Media

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