Porphyrinic metal−organic frameworks (PMOFs) are a type of emerging porous material with potential applications in catalysis, biomedicine, and sensing. Despite their plentiful advantages, the applications of many PMOFs are ultimately limited by their water stability. The water stability of PMOFs is influenced by the coordination interactions between metal nodes and water molecules. In this work, based on the excellent photoluminescent properties of magnesium porphyrins, the interactions between water molecules and PMOFs with 15 metal nodes were studied and assessed by the fluorescence method. First, the ligand-to-metal charge transfer (LMCT) effect of these PMOFs was investigated. Subsequently, according to the fluorescence intensity and kinetic performance of PMOFs in ethanol with different water contents, a model for the water stability of PMOFs was established, and PMOFs were classified into three categories: water stable, relatively stable, and unstable. Finally, the water-sensitive magnesium node PMOF (MgTCPP-Mg) can serve as an excellent fluorescent probe for highly sensitive detection of trace water in organic media, particularly methanol, with detection limits as low as 0.0093 % (v/v). The establishment of this evaluation method and model helps researchers choose the appropriate PMOFs according to their needs.

中文翻译：

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用于评估卟啉金属有机框架的水稳定性的荧光分析模型

卟啉金属有机框架（PMOF）是一种新兴的多孔材料，在催化、生物医学和传感方面具有潜在的应用前景。尽管具有诸多优点，但许多 PMOF 的应用最终受到其水稳定性的限制。PMOFs的水稳定性受到金属节点和水分子之间的配位相互作用的影响。本工作基于镁卟啉优异的光致发光特性，采用荧光方法研究并评估了水分子与具有15种金属节点的PMOFs之间的相互作用。首先，研究了这些 PMOF 的配体到金属电荷转移 (LMCT) 效应。随后，根据PMOFs在不同含水量乙醇中的荧光强度和动力学性能，建立了PMOFs的水稳定性模型，将PMOFs分为水稳定、相对稳定和不稳定三类。最后，水敏镁节点 PMOF (MgTCPP-Mg) 可作为出色的荧光探针，用于高灵敏度检测有机介质（特别是甲醇）中的痕量水，检测限低至 0.0093 % (v/v)。该评估方法和模型的建立有助于研究人员根据需要选择合适的PMOF。