一种新的铕金属有机框架(Eu-MOF),即[Eu(dpa)(H2O)]·0.5(bpy)·4H2O}n(H4dpa=5-(3,4-二羧基苯氧基)异苯甲酸,bpy=质子化的4,4'-联吡啶)合成并通过元素分析进行结构表征,红外光谱,和X射线单晶衍射分析。Eu-MOF通过µ4显示出基于EuIII离子和(dpa)4-配体的三维网络结构:η1,η2,η2,η2配位模式。荧光分析表明,Eu-MOF具有优异的荧光传感特性,能高效、灵敏地检测水中各种污染物:水中ANI比率荧光检测的检测限(LOD)为42.9nM,优于单峰检测限。此外,Eu-MOF对流感的峰值检测限,ORN和NB为120nM,27nM和94nM,分别。此外,XPS,LUMO轨道能级,荧光寿命,紫外吸收等原理探讨了荧光猝灭的机理。令人惊讶的是,Eu-MOF不仅具有优异的防伪能力和稳定性,可作为生活中的防伪材料,而且对流感也有很好的选择性。Eu-MOF在紫外光下对纸张上的流感有明显的荧光猝灭作用,可用于农药残留的快速原位成像试纸。
A new Europium metal-organic framework (Eu-MOF), namely [Eu(dpa) (H2O)]·0.5(bpy)·4H2O}n (H4dpa = 5-(3,4-dicarboxyphenoxy) isophenic acid, bpy = protonated 4,4\'-bipyridine) was synthesized and structurally characterized by elemental analyses, infrared spectroscopy, and X-ray single-crystal diffraction analyses. Eu-MOF shows a three-dimensional network structure based on EuIII ions and (dpa)4- ligands via µ4: η1, η2, η2, η2 coordination mode. Fluorescence analysis shows that Eu-MOF has excellent fluorescence sensing characteristics, which can efficiently and sensitively detect various pollutants in water: the limit of detection (LOD) of ratiometric fluorescence detection of ANI in water was 42.9 nM, which was better than the single-peak detection limit. In addition, the peak detection limits of Eu-MOF for Flu, ORN and NB were 120 nM, 27 nM and 94 nM, respectively. In addition, XPS, LUMO orbital energy level, fluorescence lifetime, ultraviolet absorption and other principles are used to explore the mechanism of fluorescence quenching. Surprisingly, Eu-MOF not only has excellent anti- counterfeiting ability and stability, can be used as anti-counterfeiting material in life, but also has good selectivity to Flu. Eu-MOF has obvious fluorescence quenching effect on Flu on paper under ultraviolet light, which can be used for rapid in situ imaging test paper of pesticide residues.