Three pyreno[4,5-d]imidazole derivatives are synthesized and evaluated as fluorescent sensors for bismuth (III) ion. The target compounds are prepared in 55 to 86 % yields from a condensation reaction between pyrene-4,5-dione and aromatic aldehydes. The compound bearing a phenolic group can selectively detect bismuth (III) ion via fluorescence enhancement with a detection limit of 1.20 μM in CH3 CN-DMSO mixture and 3.40 μM in 10% pH5 aqueous in CH3 CN-DMSO mixture. The sensing mechanism involving a formation of coordination complex is investigated by UV-VIS and fluorescence titrations, 1 H-NMR, and the decomplexation of the bismuth complex by sulfide ion. The application of this sensor for quantitative analysis of spiked bismuth (III) ion in real water samples from 2 different sources is demonstrated.

中文翻译：

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来自 Pyreno[4,5-d] 咪唑衍生物的铋 (III) 离子的荧光传感器

合成了三种芘 [4,5-d] 咪唑衍生物，并作为铋 (III) 离子的荧光传感器进行评估。通过芘-4,5-二酮和芳香醛之间的缩合反应，以55%至86%的产率制备目标化合物。带有酚基的化合物可以通过荧光增强选择性检测铋 (III) 离子，在 CH3 CN-DMSO 混合物中的检测限为 1.20 μM，在 CH3 CN-DMSO 混合物中的 10% pH5 水溶液中的检测限为 3.40 μM。通过 UV-VIS 和荧光滴定、 1 H-NMR 和硫化物离子对铋配合物的解络，研究了涉及配位配合物形成的传感机制。演示了该传感器用于定量分析来自 2 个不同来源的真实水样中的加标铋 (III) 离子的应用。