College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou 310014, China.
College of Health Management, Shangluo University, Beixin Street 10, Shangluo Shaanxi 726000, China.
Inorg Chem. 2023 May 8;62(18):6934-6947. doi: 10.1021/acs.inorgchem.3c00109. Epub 2023 Apr 25.
Several isostructural lanthanide metal-organic frameworks, viz. (, where Ln = Eu for , Tb for , Sm for and Dy for ), are successfully synthesized through the hydrothermal reactions of 4'-di(4-carboxylphenoxy)hydroxyl-2, 2'-bipyridyl (HDCHB) and lanthanide nitrates as well as chelator 1,10-phenantroline (phen). These structures are characterized by single-crystal X-ray diffraction, and the representative is a fivefold interpenetrated framework with the uncoordinated Lewis base N sites form DCHB ligands. The photoluminescence research studies reveal that - exhibit characteristic fluorescent emissions from ligand-induced lanthanide Ln(III) ions, while the single-component emission spectra of are all located in a white region under different excitations. The absence of coordinated water and the interpenetration property of the structures are conducive to the structure rigidity, and the results display that has high thermal/chemical stabilities in common solvents and a wide pH range as well as the boiling water. Notably, luminescent sensing studies reveal that with prominent fluorescence properties can perform in highly sensitive and selective sensing of vanillylmandelic acid (VMA) in aqueous systems ( = 562.8 L·mol; LOD = 4.6 × 10 M), which can potentially establish a detection platform for the diagnosis of pheochromocytoma via multiquenching mechanisms. Moreover, the @MMMs sensing membranes comprised of and a poly(vinylidene fluoride) (PVDF) polymer can also be facilely developed for VMA detection in aqueous media, suggesting the enhanced convenience and efficiency of practical sensing applications.
几种同构的镧系金属-有机骨架，即（，其中 Ln = Eu 为 ，Tb 为 ，Sm 为 ，Dy 为 ），通过 4'-二（4-羧基苯氧基）-2,2'-联吡啶（HDCHB）和镧系硝酸盐以及螯合剂 1,10-邻菲咯啉（phen）的水热反应成功合成。这些结构通过单晶 X 射线衍射进行了表征，代表性的 是一个五重穿插的骨架，未配位的路易斯碱 N 位形成 DCHB 配体。荧光研究表明，-从配体诱导的镧系 Ln(III)离子中表现出特征荧光发射，而 的单一组分发射光谱在不同激发下都位于白色区域。没有配位水和结构的穿插性质有利于结构的刚性，结果表明 在常见溶剂和宽 pH 值范围以及沸水中具有较高的热/化学稳定性。值得注意的是，发光传感研究表明，具有突出荧光性能的 可以在水相体系中对香草扁桃酸（VMA）进行高灵敏度和选择性传感（= 562.8 L·mol；LOD = 4.6×10 M），这可以通过多种猝灭机制为嗜铬细胞瘤的诊断建立一个检测平台。此外，由 和聚偏二氟乙烯（PVDF）聚合物组成的 @MMMs 传感膜也可以方便地用于水相介质中的 VMA 检测，这表明实际传感应用的便利性和效率得到了提高。
