A novel europium functionalized metal–organic framework (MOF) named Eu³⁺@UiO-66-NH₂-IM is robustly synthesized via covalent PSM (postsynthetic modification). The ligand of matrix MOF is covalently modified via imidazole-2-carboxaldehyde after the UiO-66-NH₂ is synthesized. The successful transformation of amino groups to imine groups is confirmed by Fourier transform infrared spectra (FTIR) analysis. The modified MOF named UiO-66-NH₂-IM shows outstanding crystalline stability. After Eu³⁺ is doped into UiO-66-NH₂-IM, the as-prepared fluorescent MOF displays the characteristic emission line of Eu³⁺. Discussion of the tunable emission color of the modified MOF is included, and white-light integration could be achieved through altering the ratio of Eu³⁺ doped into the MOF. In addition, the luminescent transparent film based on Eu³⁺@UiO-66-NH₂-IM can emit white light under proper excitation wavelength, which may be helpful to some potential applications in lighting. In addition, Eu³⁺@UiO-66-NH₂-IM shows a different emission response in water and organic solvents, and it is further developed into a sensitive probe for the detection of water content in organic solvents (ethanol, DMF) with low detection limits (0.088 and 0.054%, respectively) by utilizing its quenching behavior in water. Meanwhile, Eu³⁺@UiO-66-NH₂-IM displays a greatly selective and sensitive response for detecting aniline with a low detection limit (0.072%) and a broad linear range (0–3.75%), and the signal of the detection is obvious, which can be seen clearly under the irradiation of UV light.

中文翻译：

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基于共价修饰的镧系金属-有机骨架的有机溶剂中苯胺和痕量水的高灵敏发光探针

通过共价PSM（合成后修饰）稳健地合成了一种新颖的functional官能化金属-有机骨架（MOF），名为Eu ³⁺ @ UiO-66-NH ₂ -IM。在合成UiO-66-NH ₂之后，通过咪唑-2-甲醛对基质MOF的配体进行共价修饰。傅立叶变换红外光谱（FTIR）分析证实了氨基向亚胺基的成功转化。名为UiO-66-NH ₂ -IM的改性MOF显示出出色的晶体稳定性。将Eu ³⁺掺杂到UiO-66-NH ₂ -IM中后，制备的荧光MOF表现出Eu ³⁺的特征发射线。讨论了改性MOF的可调发射颜色，并且可以通过改变掺杂到MOF中的Eu ³⁺的比例来实现白光集成。另外，基于Eu ³⁺ @ UiO-66-NH ₂ -IM的发光透明膜可以在适当的激发波长下发出白光，这可能对照明的某些潜在应用有所帮助。此外，Eu ³⁺ @ UiO-66-NH ₂ -IM在水和有机溶剂中显示出不同的发射响应，并且进一步发展成为用于检测有机溶剂（乙醇，DMF）中水含量的灵敏探针。通过利用其在水中的猝灭性能，检测限低（分别为0.088和0.054％）。同时，欧盟³⁺ @ UiO-66-NH ₂ -IM对苯胺的检测具有极高的选择性和灵敏性，检测限低（0.072％），线性范围宽（0-3.75％），检测信号明显，在紫外线的照射下可以清楚地看到。