高灵敏、多响应的镧系金属有机骨架的设计、合成和荧光传感性能

基于5-(3，4-二羧基苯氧基)间苯二甲酸(H₄dppa)配体，通过水热法设计并合成了2种镧系金属有机骨架(Ln-MOFs)：{(dima)Dy (dppa)(H₂O)₂]·2.5H₂O}_n(Dy-MOF)和{(dima)Eu (dppa)(H₂O)₂]·1.5H₂O}_n(Eu-MOF)(dima=二甲胺阳离子)。并用元素分析、红外光谱、单晶X射线衍射等对其进行了结构表征。2种Ln-MOFs为异质同构的二维网状结构，相邻的二维网络通过氢键作用进一步形成三维超分子网络结构。荧光分析表明Dy-MOF和Eu-MOF在室温下具有优良的荧光性能，而且Dy-MOF还具有优异的荧光传感性能，可高效、高灵敏检测多种水中污染物：苯胺(ANI)、硝基苯(NB)、四环素(TC)、嘧霉胺(PTH)以及色氨酸(Trp)。此外还探究了Dy-MOF检测污染物时的荧光淬灭机理。

Design, synthesis, and fluorescence sensing performance of highly sensitive and multi-response lanthanide metal-organic frameworks

Based on the 5-(3,4-dicarboxyphenoxy) isophthalic acid (H₄dppa) ligand, two lanthanide metal-organic frameworks (Ln-MOFs) were designed and synthesized by hydrothermal synthesis: {(dima)Dy(dppa)(H₂O)₂]·2.5H₂O}_n (Dy - MOF) and {(dima) Eu(dppa) (H₂O)₂]·1.5H₂O}_n (Eu - MOF) (dima=dimethylamine cation). The structures were characterized by elemental analysis, infrared spectroscopy, single-crystal X-ray diffraction, etc. Dy-MOF and Eu- MOF are hetero-isomorphic 2D network structures, and adjacent 2D networks further form 3D supramolecular network structures through hydrogen bonding. Fluorescence analysis shows that Dy-MOF and Eu-MOF have excellent fluorescence properties at room temperature, and Dy-MOF has excellent fluorescence sensing properties, which can efficiently and high-sensitively detect a variety of pollutants in water: aniline (ANI), nitrobenzene (NB), tetracycline (TC), pyrimethanil (PTH), and tryptophan (Trp). The fluorescence quenching mechanism of Dy-MOF in detecting pollutants was also investigated.