Facile synthesis of dual-ligand Eu-MOF for ratiometric fluorescence and smartphone-assisted visual detection of Al3+

IF 4.1 3区工程技术 Q2 CHEMISTRY, APPLIED

Dyes and Pigments Pub Date : 2025-04-05 DOI:10.1016/j.dyepig.2025.112812

Xinyue Ge, Jibing Chen, Shixiao Guo, Yan Zhao, Weiheng Kong, Ensheng Zhang, Lian Xia, Rong-Mei Kong

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引用次数: 0

Abstract

In this study, a neoteric dual-ligand europium metal-organic framework (Eu-MOF) was synthesized by a simple one-pot method for visual detection of Al³⁺. The Eu-MOF was prepared with 2,5-dihydroxyterephthalic acid (H₂DHT) and dipicolinic acid (DPA) as dual-ligand and Eu³⁺ ions as a metal node, also denoted as Eu–H₂DHT/DPA. Benefitting from the specific coordination of Al³⁺ by hydroxyl group of the ligand H₂DHT, the emission at 515 nm derived from H₂DHT increased significantly through an excited-state intramolecular proton transfer (ESIPT) mechanism. However, the emission at 620 nm from Eu³⁺ changed slightly which was used as the reference signal. The Eu–H₂DHT/DPA probe exhibited clearly recognizable color change from orange-red to yellow-green with the increasing Al³⁺ concentration. In conjunction with smartphone to read color hue, the sensitive visual quantitative detection of Al³⁺ was realized. Moreover, the feasibility of detection of Al³⁺ in real water samples was verified. This study offers a sensitive and convenient route in the design and fabrication of novel fluorescence ratiometric probe with self-calibration model for detection of contaminants in practical water samples.

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双配体Eu-MOF的简易合成及其对Al3+的比例荧光和智能手机辅助视觉检测

本研究采用简单的一锅法合成了一种新型双配体铕金属有机骨架（Eu-MOF），用于Al3+的视觉检测。以2,5-二羟基对苯二甲酸（H2DHT）和二吡啶酸（DPA）为双配体，以Eu3+离子为金属节点制备Eu-MOF，记作Eu-H2DHT /DPA。得益于H2DHT的羟基与Al3+的特异性配位，H2DHT在515 nm处的发射光谱通过激发态分子内质子转移（ESIPT）机制显著增加。而作为参考信号的Eu3+在620 nm处的发射光谱变化不大。随着Al3+浓度的增加，Eu-H2DHT /DPA探针呈现出明显的由橙红色到黄绿色的颜色变化。配合智能手机读取色相，实现了Al3+的灵敏视觉定量检测。验证了在实际水样中检测Al3+的可行性。本研究为设计和制作具有自校准模型的新型荧光比例探针，用于实际水样中污染物的检测提供了一条灵敏、便捷的途径。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Dyes and Pigments 工程技术-材料科学：纺织

CiteScore

8.20

自引率

13.30%

发文量

933

审稿时长

33 days

期刊介绍： Dyes and Pigments covers the scientific and technical aspects of the chemistry and physics of dyes, pigments and their intermediates. Emphasis is placed on the properties of the colouring matters themselves rather than on their applications or the system in which they may be applied. Thus the journal accepts research and review papers on the synthesis of dyes, pigments and intermediates, their physical or chemical properties, e.g. spectroscopic, surface, solution or solid state characteristics, the physical aspects of their preparation, e.g. precipitation, nucleation and growth, crystal formation, liquid crystalline characteristics, their photochemical, ecological or biological properties and the relationship between colour and chemical constitution. However, papers are considered which deal with the more fundamental aspects of colourant application and of the interactions of colourants with substrates or media. The journal will interest a wide variety of workers in a range of disciplines whose work involves dyes, pigments and their intermediates, and provides a platform for investigators with common interests but diverse fields of activity such as cosmetics, reprographics, dye and pigment synthesis, medical research, polymers, etc.