Tb³⁺-doped zinc-based coordination polymer nanospindle bundles (Zn-PDC/Tb³⁺, or [Zn(2,5-PDC)(H₂O)₂]·H₂O/Tb³⁺) were synthesized by a simple solution precipitation route at room temperature, employing Zn(NO₃)₂, Tb(NO₃)₃, and 2,5-Na₂PDC as the initial reactants, and a mixture of water and ethanol with the volume ratio of 10:10 as the solvent. The as-obtained nanostructures presented strong fluorescent emission under the excitation of 298 nm light, which was attributed to the characteristic emission of the Tb³⁺ ion. It was found that the above-mentioned strong fluorescence of the nanostructures could be selectively quenched by cefixime (CFX) in aqueous solution. The other common antibiotics hardly interfered. Thus, as-obtained Zn-PDC/Tb³⁺ nanostructures could be prepared as a highly sensitive fluorescence probe for selective detection of CFX in an aqueous system. The corresponding detection limit reached 72 ppb. The theoretic calculation and UV–vis absorption experiments confirmed that the fluorescence quenching of Zn-PDC/Tb³⁺ nanostructures toward CFX should be attributed to the electron transfer and the fluorescence inner filter effect between the fluorescent matter and the analyte. In addition, the strong fluorescence of the nanostructures could also be selectively quenched by acetone in the water system.

中文翻译：

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荧光Zn-PDC / Tb ³⁺配位聚合物纳米结构：高选择性检测头孢克肟抗生素和丙酮在水性系统中的候选人

通过合成Tb ³⁺掺杂的锌基配位聚合物纳米锭束（Zn-PDC / Tb ³⁺或[Zn（2,5-PDC）（H ₂ O）₂ ]·H ₂ O / Tb ³⁺）。一种简单的室温溶液沉淀路线，采用Zn（NO ₃）₂，Tb（NO ₃）₃和2,5-Na ₂ PDC作为初始反应物，以及水和乙醇的体积比为10的混合物：10作为溶剂。如此获得的纳米结构在298 nm光的激发下呈现出强荧光发射，这归因于Tb ³⁺的特征发射。离子。已经发现，可以通过头孢克肟（CFX）在水溶液中选择性地猝灭上述纳米结构的强荧光。其他常见的抗生素几乎没有干扰。因此，可以将获得的Zn-PDC / Tb ³⁺纳米结构制备为高灵敏度的荧光探针，用于选择性检测水性体系中的CFX。相应的检出限达到了72 ppb。理论计算和紫外可见吸收实验证实了Zn-PDC / Tb ³⁺的荧光猝灭朝向CFX的纳米结构应归因于荧光物质与分析物之间的电子转移和荧光内部过滤作用。另外，纳米结构的强荧光也可以在水系统中用丙酮选择性地猝灭。