Fabrication of Two Isomorphic and Hyperstable Rare Earth-Based Metal–Organic Frameworks with Efficient Ratiometric Probe and Photocatalytic Performances
Geng Tan, Ruo-Qin Jia, Xin Zhao, Yuqiong Guo, Lilei Zhang, Xiaohan Wang, Jian‐Ge Wang, Xun Feng, Bo Li, Li‐Ya Wang
Abstract
Two isomorphic lanthanide compounds {[Ln(ddpp)(H2O)]·CH3CN}n (Ln = Eu and Gd, H4ddpp = 2,5-di(2′,4′-dicarboxylphenyl)pyridine) were synthesized. Complex 1-Eu displays ultrahigh acid–base stability and thermal stability. Furthermore, luminescence measurements revealed that 1-Eu could detect quinolone antibiotics with an ultralow limit of detection in aqueous solution. The ratiometric probe properties for sensing antibiotics could be attributed to the incompletely sensitized Eu3+ ion of the ligand. Remarkably, it is interesting that 1-Gd exhibits excellent tetracycline degradation properties under visible light. Ultraviolet–visible diffuse reflectance spectroscopy and valence band X-ray photoelectron spectroscopy were carried out to investigate the photodegradation mechanisms. Moreover, a rational explanation for the fluorescent probe and photocatalysis behavior of these two complexes was also discussed with the assistance of density functional theory calculations.