Abstract A Schiff base-type fluorescent probe, PTAID, based on purine derivative was designed and synthesized. To our delight, this probe PTAID could quickly recognize Pd2+ and Cu2+ in HEPES buffer solution without the interfering from other ions. The fluorescent probe PTAID displayed significant and specific fluorescence quenching towards Pd2+ and Cu2+ with high selectivity and sensitivity, and accompanied by a visual color change of the probe solution from colorless to yellow. The detection limits of PTAID for Pd2+ and Cu2+ in HEPES buffer solution were 0.63 μM and 1.19 μM, respectively. Moreover, the binding mechanisms of PTAID towards Pd2+ and Cu2+ were supported by Job’s plot. Finally, the probe PTAID was successfully made test paper to detect Pd2+ and Cu2+ in a solid state.

中文翻译：

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一种基于嘌呤衍生物的双功能比色和“开关”荧光探针，用于检测 Pd2+ 和 Cu2+：作为试纸的应用

摘要 设计合成了一种基于嘌呤衍生物的席夫碱型荧光探针PTAID。令我们高兴的是，该探针 PTAID 可以在不受其他离子干扰的情况下快速识别 HEPES 缓冲溶液中的 Pd2+ 和 Cu2+。荧光探针 PTAID 对 Pd2+ 和 Cu2+ 表现出显着且特异性的荧光猝灭，具有高选择性和灵敏度，并伴随着探针溶液从无色到黄色的视觉颜色变化。PTAID 对 HEPES 缓冲溶液中 Pd2+ 和 Cu2+ 的检测限分别为 0.63 μM 和 1.19 μM。此外，Job's plot 支持 PTAID 对 Pd2+ 和 Cu2+ 的结合机制。最后，探针PTAID成功制作了测试固态Pd2+和Cu2+的试纸。