Abstract We report the fabrication of water-stable, supermicroporous fluorescent chemosensors (MFCs) using Zr-based metal-organic frameworks (MOFs) as scaffolds for selective fluorescent determination of the ultra-traces of heavy metals, such as Zn2+ ions from water resources. The MFCs structures was developed by direct decoration of hydrophobic fluorescent probes (2,2′-((1Z,12Z)-5,9-dithia-2,12-diazatrideca-1,12-diene-1,13 diyl) diphenol), (S1) into the Zr-based metal-organic frameworks (MOFs). Significantly, the MFCs design with uniform super-microgroove pores, long-range intergrowing crystal, and dense decoration of fluorescent probes, leading to create active hook surface sheaths as sensitive and selective chemosensors platforms for ultra-trace monitoring of Zn2+ ions. The MFCs supermicro-crystal structures have shown synergistic enhancement in selective sensing assay associated with low-detection limit up to part-per-billion (ppb), wide-range determination (0.5 ppb to 2000 ppb) and fast response monitoring in the order of second during the binding of Zn2+ ion target. The selectivity of Zn2+ ions fluorometric sensing process in a heterogeneous mixture of inorganic cations and anions was mainly dependent on the structure of the fluorescent probe, pH condition, competitive ion system composition, and Zn-to-fluorescent probe binding procedure. Our developed MFCs showed a wide range of detection of Zn2+ ions with a considerably low detection limit of approximately 10−9 mol/L, in optimal working condition. The long-term stability of MFCs with fluorescent surface functionality enabled the practical and multiple reuse/cycles of Zn2+ ion determination.

中文翻译：

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使用超微孔 Zr-MOFs 化学传感器对 Zn 2+ 离子进行灵敏和选择性的荧光测定和监测

摘要 我们报告了使用 Zr 基金属有机框架 (MOF) 作为支架制造水稳定的超微孔荧光化学传感器 (MFC)，用于选择性荧光测定超痕量重金属，例如来自水资源的 Zn2+ 离子。MFCs 结构是通过直接修饰疏水性荧光探针 (2,2'-((1Z,12Z)-5,9-dithia-2,12-diazatrideca-1,12-diene-1,13 diphenol) 来开发的) , (S1) 转化为 Zr 基金属有机框架 (MOF)。值得注意的是，MFCs 设计具有均匀的超微槽孔、长程互生晶体和荧光探针的密集装饰，导致创建活性钩表面鞘作为敏感和选择性的化学传感器平台，用于 Zn2+ 离子的超痕量监测。MFCs 超微晶体结构在选择性传感分析中显示出协同增强，与高达十亿分之一 (ppb) 的低检测限、宽范围测定（0.5 ppb 至 2000 ppb）和快速响应监测相关第二个在结合 Zn2+ 离子靶标的过程中。在无机阳离子和阴离子的异质混合物中，Zn2+ 离子荧光传感过程的选择性主要取决于荧光探针的结构、pH 条件、竞争性离子系统组成和 Zn 与荧光探针的结合过程。我们开发的 MFC 在最佳工作条件下显示出对 Zn2+ 离子的广泛检测，检测限相当低，约为 10-9 mol/L。