Iron ion (Fe) is essential for the environment and human health. Detecting Fe in water is crucial, making high-performance detection a key objective. Lanthanide metal-organic frameworks with abundant functional sites have been deemed a promising fluorescence sensor for Fe detection. Currently, most metal-organic framework-based sensors for Fe detection have cumbersome and time-consuming synthesis procedures and long detection times, which greatly limits their practical application. This study aims to construct a hybrid lanthanide metal-organic frameworks-based fluorescence sensor for Fe detection that promises simple and rapid iron ion quantification in water. A novel hybrid lanthanide metal-organic frameworks (ECTMNs) was synthesized in one step using a solvothermal method with only 4 h. The frameworks comprise two metal ions, cerium and europium, serving as metal centers, and 4,4,4,4-(Porphine-5,10,15,20-tetrayl) tetrakis (TCPP) as an organic ligand. With the addition of Fe, the host-guest reaction occurred between Fe and ECTMNs probe, leading to the gradual fluorescence burst of ECTMNs probe. A strong linear correlation between ECTMNs fluorescence intensity and Fe concentration (1–90 μM) makes it a reliable sensor for Fe monitoring with a detection limit of 0.3 μM. Moreover, the method was used to analyze real samples (tap water and river water), showing good recoveries (92–98 %) and low relative standard deviations (3.96–6.11 %), making it a promising option for rapidly detecting Fe. A rapid synthesis protocol for hybrid lanthanide metal-organic frameworks is proposed in this study. The obtained ECTMNs exhibits good water solubility, high stability, and specificity for Fe. Based on ECTMNs, an innovative fluorescence sensor is established for selectively detecting Fe in water, which is a simple operation method with a low detection limit and short sensing time. It provides a novel method for accurately and rapidly detecting Fe in environmental pollution and water safety monitoring.

中文翻译：

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一种基于卟啉的新型杂化镧系金属有机框架用于快速检测铁离子


铁离子（Fe）对于环境和人类健康至关重要。检测水中的铁至关重要，因此高性能检测成为一个关键目标。具有丰富功能位点的镧系金属有机框架被认为是一种有前途的铁检测荧光传感器。目前，大多数基于金属有机骨架的Fe检测传感器合成步骤繁琐耗时，检测时间长，极大地限制了其实际应用。本研究旨在构建一种基于混合稀土金属有机骨架的荧光传感器，用于铁检测，有望简单快速地定量水中的铁离子。使用溶剂热法一步合成了一种新型杂化镧系金属有机框架 (ECTMN)，仅需 4 小时。该框架包含两种金属离子，即铈和铕，作为金属中心，以及4,4,4,4-(卟吩-5,10,15,20-四基)四(TCPP)作为有机配体。随着Fe的添加，Fe与ECTMNs探针之间发生主客体反应，导致ECTMNs探针逐渐发出荧光。 ECTMN 荧光强度与 Fe 浓度 (1–90 µM) 之间的强线性相关性使其成为检测限为 0.3 µM 的可靠 Fe 监测传感器。此外，该方法用于分析实际样品（自来水和河水），显示出良好的回收率（92-98%）和较低的相对标准偏差（3.96-6.11%），使其成为快速检测铁的有前途的选择。本研究提出了杂化镧系金属有机框架的快速合成方案。所得的ECTMNs表现出良好的水溶性、高稳定性和对Fe的特异性。 基于ECTMNs，建立了一种创新的荧光传感器，用于选择性检测水中的Fe，该方法操作简单，检测限低，传感时间短。为环境污染和水安全监测中准确、快速检测Fe提供了一种新方法。