Zn-coordination polymers for fluorescence sensing various contaminants in water.

The series of LCP 1 – 3 with different structures showed good responses to Fe3+, NB, CAP, and PTH, among which LCP 2 with 2D structure exhibited better LOD values than those reported in the literature. The practical application of LCP 1 – 3 for the detection of PTH in fruits was excellent. And the mechanism of fluorescence quenching was a combination of PET, CA and RET. [Display omitted] • Design and construct a series of LCP 1-3 with 1D, 2D, 1D structures. • LCP 2 has the most response to Fe3+, PTH, NB, and CAP and anti-interference properties. The LOD is better than some of the values reported in the literature. • LCP 1-3 are effective in detecting pyrimethamine in apples, apple skins, and grape skins. 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 ⋅H 2 O (1), [Zn 3 (tib) 2 (mpda) 3 ] n ⋅5H 2 O (2), [Zn (tib)(ppda)] n ⋅H 2 O (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. [ABSTRACT FROM AUTHOR]