Inorganic Chemistry · 2022 · 34 citations · 50 references
Two isomorphic lanthanide compounds {[Ln(ddpp)(H<sub>2</sub>O)]·CH<sub>3</sub>CN}<sub><i>n</i></sub> (Ln = Eu and Gd, H<sub>4</sub>ddpp = 2,5-di(2',4'-dicarboxylphenyl)pyridine) were synthesized. Complex <b>1-Eu</b> displays ultrahigh acid-base stability and thermal stability. Furthermore, luminescence measurements revealed that <b>1-Eu</b> 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 Eu<sup>3+</sup> ion of the ligand. Remarkably, it is interesting that <b>1-Gd</b> 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.
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