Zn-coordination polymers for fluorescence sensing various contaminants in water

Ya-Fei Ma; Xiao-Li Liu; Xue-Ying Lu; Mei-Li Zhang; Yi-Xia Ren; Xiao-Gang Yang

doi:10.1016/j.saa.2023.123803

Zn-coordination polymers for fluorescence sensing various contaminants in water

Spectrochim Acta A Mol Biomol Spectrosc. 2024 Mar 15:309:123803. doi: 10.1016/j.saa.2023.123803. Epub 2023 Dec 27.

Authors

Ya-Fei Ma¹, Xiao-Li Liu¹, Xue-Ying Lu¹, Mei-Li Zhang², Yi-Xia Ren¹, Xiao-Gang Yang³

Affiliations

¹ Department of Chemistry and Chemical Engineering, Laboratory of New Energy ＆ New Function Materials, Yan'an University, Yan'an, Shaanxi 716000, PR China.
² Department of Chemistry and Chemical Engineering, Laboratory of New Energy ＆ New Function Materials, Yan'an University, Yan'an, Shaanxi 716000, PR China. Electronic address: ydzml2332041@163.com.
³ College of Chemistry and Chemical Engineering, and Henan Key Laboratory of Function-Oriented Porous Materials, Luoyang Normal University, Luoyang 471934, PR China.

PMID: 38159382
DOI: 10.1016/j.saa.2023.123803

Abstract

Luminescent coordination polymers (LCPs) have garnered significant attention from researchers as promising materials for detecting contaminants. In this paper, three new LCPs ([Zn(tib)(opda)]_n⋅H₂O (1), [Zn₃(tib)₂(mpda)₃]_n⋅5H₂O (2), [Zn (tib)(ppda)]_n⋅H₂O (3)) with different structures (LCP 1-3: 1D, 2D, 1D) using phenylenediacetic acid isomers and 1,3,5-tris (1-imidazolyl) benzene (tib) are synthesized. The specific surface areas (BET) of LCP 1-3 are 4 m²/g, 19 m²/g, and 13 m²/g respectively. LCP 1-3 exhibit excellent fluorescence properties and can serve as fluorescent probe for the detection of inorganic contaminants and organic contaminants. Due to the large BET of LCP 2, the detection limits for trace analytes surpass those of LCP 1 and 3. The detection limits of LCP 2 for Fe³⁺, nitrobenzene (NB), chloramphenicol (CAP), and pyrimethanil (PTH) are 8.3 nM, 0.016 μM, 0.19 μM, and 0.032 μM, respectively, and the fluorescence quenching rates are 98.6 %, 98.8 %, 92.3 %, and 98.8 %, respectively. These values outperform most reported in the literature. The quantum yields of LCP 1-3 are 11.84 %, 25.22 %, 22.00 % respectively. Real sample testing of LCP 1-3 reveals favorable performance, where spiked recoveries of LCP 2 for the detection of pyrimethanil in grape skins ranged from 99.62 % to 119.3 % with a relative standard deviation (RSD) of 0.627 % to 4.56 % (n = 3). The fluorescence quenching mechanism was attributed to a combination of photoelectron transfer (PET), resonance energy transfer (RET), and competitive absorption (CA). This study advances the application of LCPs in luminescence sensing and contributes to the expansion of novel materials for detecting environmental pollutants.

Keywords: Contaminants; Coordination polymers (CPs); Fluorescence quenching mechanism; Fluorescence sensing.