Two europium-postdoped metal organic frameworks (MOFs) Eu³⁺@1 and Eu³⁺@2 [1:{[Zn₂(bta)(bpy)(H₂O)₂]·2H₂O}_n, 2:{[Ni(bta)(bpy)(H₂O)₂][Ni(bpy)·(H₂O)₄]·4H₂O}_n (H₄bta = 1, 2, 3, 5-benzenetetracarboxylic acid, bpy = 4, 4′-dipyridine)] were prepared by hydrothermal synthesis and post-synthesis modification. MOFs 1–2 are all three-dimensional network structure connected by (bta)^4- and bpy ligands. Eu³⁺@1 and Eu³⁺@2 in aqueous solution can achieve the quantitative detection of 2, 4, 6-trinitrobenzene (TNP), tetracycline (TC) and pesticides with high sensitivity and selectivity. In particular, when the volume of TNP increases to 50 μL, the luminescence quenching rate of Eu³⁺@2 can reach 99.7% and the LOD for TNP can reach 78 nM. Interestingly, Eu³⁺@1 has a good response to PTH (Pyrimethanil), while Eu³⁺@2 has a good selectivity to FLU (Fluazinam), and both can be used for rapid in-situ imaging detection of simulated pesticide residues on fresh vegetables. Under UV lamp, Eu³⁺@1 showed a significant fluorescence quenching effect on PTH in beans, while the fluorescence quenching effect of Eu³⁺@2 on FLU on cabbage was obvious. Surprisingly, two kinds of composite materials can be used as anti-counterfeiting ink functional material with strong anti-counterfeiting ability and long term stability.

两种铕后掺杂金属有机骨架 (MOF) Eu ³⁺ @1 和 Eu ³⁺ @2 [ 1 :{[Zn ₂ (bta)(bpy)(H ₂ O) ₂ ]·2H ₂ O} _n , 2 : {[Ni(bta)(bpy)(H ₂ O) ₂ ][Ni(bpy)·(H ₂ O) ₄ ]·4H ₂ O} _n (H ₄ bta = 1, 2, 3, 5-苯四甲酸, bpy = 4, 4'-联吡啶)]是通过水热合成和合成后改性制备的。MOFs 1 - 2都是由 (bta) 连接的三维网络结构^4-和 bpy 配体。水溶液中的Eu ³⁺ @ 1和Eu ³⁺ @ 2可以实现对2, 4, 6-三硝基苯(TNP)、四环素(TC)和农药的定量检测，具有高灵敏度和高选择性。特别是当TNP的体积增加到50 μL时，Eu ³⁺ @ 2的发光猝灭率可以达到99.7%，TNP的LOD可以达到78 nM。有趣的是，Eu ³⁺ @1 对 PTH（嘧霉胺）反应良好，而 Eu ³⁺ @ 2对FLU（氟啶胺）具有良好的选择性，均可用于新鲜蔬菜模拟农药残留的快速原位成像检测。在紫外灯下，Eu ³⁺ @ 1对豆类中的PTH有显着的荧光猝灭作用，而Eu ³⁺ @ 2对白菜FLU的荧光猝灭作用明显。令人惊讶的是，两种复合材料都可以用作防伪墨水功能材料，具有很强的防伪能力和长期稳定性。