Fabrication of Two Isomorphic and Hyperstable Rare Earth-Based Metal–Organic Frameworks with Efficient Ratiometric Probe and Photocatalytic Performances

• Published in: Inorganic chemistry 2022-08, Vol.61 (30), p.11866-11878
• Main Authors: Tan, Geng, Jia, Ruo-Qin, Zhao, Xin, Guo, Yu-Qiong, Zhang, Li-Lei, Wang, Xiao-Han, Wang, Jian-Ge, Feng, Xun, Li, Bo, Wang, Li-Ya
• Format: Article
• Language: English
• ISSN: 0020-1669; 1520-510X
• DOI: 10.1021/acs.inorgchem.2c01619

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.