In this study, an alkynyl-modified aromatic dicarboxylic acid bifunctional ligand was selected to construct lanthanide compound {[Eu₄(ebdc)₆(4,4-bpy)_0.5(H₂O)_4.5]·(C₂H₅OH)_1.25(H₂O)}_n (Eu-MOF, H₂ebdc = 5-ethynyl-isophthalic acid, 4,4-bpy = 4,4-bipyridine, and MOF = metal-organic framework), of which the uncoordinated alkynyl group would be used to anchor silver nanoclusters (Ag NCs). The Eu-MOF exhibits double emission peaks, located at 492 and 611 nm, respectively, in which the high-energy blue emission is associated with alkynyl-modified ligand while the low-energy red emission belongs to characteristic emission of Eu³⁺, indicating that ligands can effectively sensitize Eu³⁺ luminescence. The intensity ratio of the dual emission fluorescence peaks of Eu-MOF displays a good linear relationship with temperature, which realizes the detection function in the low temperature region of 75–275 K, and the thermal sensitivity reaches 1.5398%·K⁻¹. After anchoring the Ag NCs, the high-energy blue emission is significantly quenched, indicating that the Ag NCs are indeed confined into the framework and interact with the alkynyl group, and thus change the overall electronic distribution. This is the first case of anchoring Ag NCs by a luminescent Eu-MOF and studying nanocluster loading by using spectroscopic properties. In addition, the Ag NCs@Eu-MOF also shows a good catalytic activity for cycloaddition reaction from CO₂ and epoxides. This study not only provides ideas for exploring the changes in optical properties of luminescent MOFs and Ag NCs caused by confinement effect, but also expands their potential applications in various fields.

本研究选用炔基修饰的芳族二羧酸双功能配体构建镧系化合物{[Eu ₄ (ebdc) ₆ (4,4-bpy) _0.5 (H ₂ O) _4.5 ]·(C ₂ H ₅ OH) _1.25 (H ₂ O)} _n (Eu-MOF, H ₂ebdc = 5-乙炔基-间苯二甲酸，4,4-bpy = 4,4-联吡啶，MOF = 金属有机框架），其中未配位的炔基将用于锚定银纳米团簇（Ag NC）。Eu-MOF呈现双发射峰，分别位于492和611 nm，其中高能蓝色发射与炔基修饰的配体相关，而低能红色发射属于Eu ³⁺的特征发射，表明配体可以有效地敏化Eu ³⁺发光。Eu-MOF双发射荧光峰强度比与温度呈良好的线性关系，实现了75~275 K低温区的检测功能，热灵敏度达到1.5398%·K ⁻¹. 锚定 Ag NCs 后，高能蓝色发射明显猝灭，表明 Ag NCs 确实被限制在框架内并与炔基相互作用，从而改变了整体电子分布。这是第一个通过发光的 Eu-MOF 锚定 Ag NCs 并利用光谱特性研究纳米团簇负载的案例。此外，Ag NCs@Eu-MOF对CO ₂和环氧化物的环加成反应也表现出良好的催化活性。该研究不仅为探索限域效应引起的发光MOFs和Ag NCs光学性质的变化提供了思路，也拓展了它们在各个领域的潜在应用。