A dual emission ratiometric fluorescent probe constructed based on MOF-embedded dye for sequential detection of Al3+ and PPA

IF 4 2区化学 Q2 CHEMISTRY, PHYSICAL

Journal of Molecular Structure Pub Date : 2024-10-23 DOI:10.1016/j.molstruc.2024.140494

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Abstract

The ratiometric fluorescence probe has a self-calibration system that greatly reduces interference from the external environment, it has high sensitivity and accuracy in qualitative and quantitative experiments. In this work, a novel ratio fluorescence probe (RhB@1) was constructed by enclosing Rhodamine B (RhB) in the channel of [Cd₂(H₂L)₂(1,4-bib)₂]•DMA (H₂L=2-hydroxyterephthalic acid, 1,4-bib=1, 4-bis (imidazol-1-ylmethyl) benzene). The probe can display dual emission characteristics under a single excitation. Al³⁺ ion was detected by RhB@1. The results showed that the fluorescence of 1 in RhB@1 was increased, the fluorescence of RhB is unchanged, and limit of detection (LOD) of Al³⁺ is as low as 20 .9nM. Interestingly, when PPA (phenylpyruvic acid) is added to the mixture of RhB@1 and Al³⁺, PPA competes with RhB@1 for Al³⁺ result in achieving continuous ratio sensing of Al³⁺ and PPA, and LOD of PPA is 3 .21nM. More importantly, the response of RhB@1 to Al³⁺ in tap water and PPA in artificial urine was quantitatively determined by label recovery method. The results showed that the recovery rate were 97.706 %–99.060 % (Al³⁺) and 94.732 %–98.100 % (PPA). In addition, we prepared a portable test paper modified with carboxymethyl cellulose. This test paper has obvious color change when detecting Al³⁺ under ultraviolet light, which is easy to detect Al³⁺ by naked eye.

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基于嵌入式 MOF 染料构建的双发射比率荧光探针，用于顺序检测 Al3+ 和 PPA

比率荧光探针具有自校准系统，可大大降低外界环境的干扰，在定性和定量实验中都具有很高的灵敏度和准确性。本研究将罗丹明 B（RhB）封闭在[Cd2(H2L)2(1,4-bib)2]-DMA（H2L=2-羟基对苯二甲酸，1,4-bib=1, 4-双（咪唑-1-基甲基）苯）通道中，构建了一种新型比率荧光探针（RhB@1）。该探针可在单一激发下显示双重发射特性。结果表明，RhB@1 中 1 的荧光增强，RhB 的荧光不变，Al3+ 的检测限（LOD）低至 20.9nM。有趣的是，当在 RhB@1 和 Al3+ 的混合物中加入 PPA（苯丙酮酸）时，PPA 会与 RhB@1 竞争 Al3+，从而实现 Al3+ 和 PPA 的连续比对感应，PPA 的检测限为 3.21nM。更重要的是，通过标记回收法定量测定了 RhB@1 对自来水中 Al3+ 和人工尿液中 PPA 的响应。结果表明，回收率分别为 97.706 %-99.060 %（Al3+）和 94.732 %-98.100 %（PPA）。此外，我们还制备了一种用羧甲基纤维素改性的便携式试纸。该试纸在紫外光下检测 Al3+ 时有明显的颜色变化，便于肉眼检测 Al3+。

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来源期刊

Journal of Molecular Structure 化学-物理化学

CiteScore

7.10

自引率

15.80%

发文量

2384

审稿时长

45 days

期刊介绍： The Journal of Molecular Structure is dedicated to the publication of full-length articles and review papers, providing important new structural information on all types of chemical species including: • Stable and unstable molecules in all types of environments (vapour, molecular beam, liquid, solution, liquid crystal, solid state, matrix-isolated, surface-absorbed etc.) • Chemical intermediates • Molecules in excited states • Biological molecules • Polymers. The methods used may include any combination of spectroscopic and non-spectroscopic techniques, for example: • Infrared spectroscopy (mid, far, near) • Raman spectroscopy and non-linear Raman methods (CARS, etc.) • Electronic absorption spectroscopy • Optical rotatory dispersion and circular dichroism • Fluorescence and phosphorescence techniques • Electron spectroscopies (PES, XPS), EXAFS, etc. • Microwave spectroscopy • Electron diffraction • NMR and ESR spectroscopies • Mössbauer spectroscopy • X-ray crystallography • Charge Density Analyses • Computational Studies (supplementing experimental methods) We encourage publications combining theoretical and experimental approaches. The structural insights gained by the studies should be correlated with the properties, activity and/ or reactivity of the molecule under investigation and the relevance of this molecule and its implications should be discussed.