1,3-Diphenyl-1H-pyrazolo[3,4-b]quinoline: A Versatile Fluorophore for the Design of Brightly Emissive Molecular Sensors
摘要:
The 1,3-diphenyl-1H-pyrazolo[3,4-b]-quinoline chromophore is a versatile building block for the construction of brightly fluorescent molecular sensors. Facile synthetic procedures allow integration of the chromophore into fluorophore-spacer-receptor systems as well as fluorolonophores operating via intramolecular charge transfer. Whereas the former photoinduced electron-transfer probes show strong analyte-induced fluorescence enhancement, the latter exhibit bright ratiometric dual emission. Employing prototype macrocyclic receptors, the favorable signaling features for metal ion recognition are demonstrated.
荧光染料 2-[(2-Hydroxyethyl)-(1,3-diphenyl-1 H - pyrazolo[3,4- b ]quinolin-6-ylmethyl)-amino]ethanol (LL1)检查了它在检测小无机阳离子(锂、钠、钡、钙、镁、镉、铅和锌)方面的效率。该染料在实验室合成,并通过稳态和时间分辨荧光技术进行研究。该化合物用作荧光传感器,适用于检测强极性溶剂(乙腈)中的小无机阳离子(锂、钠、钡、钙、镁、镉、铅和锌)。从分子的电子给体部分(受体)到受体部分(荧光团)的电子转移被认为是化合物作为传感器功能的主要机制。该过程可以在受体部分与无机阳离子络合时被延迟。观察到含有指示剂的氨基醇对二值阳离子的灵敏度相对较高但选择性较差。然而,在加入一定量的水后,该传感器的选择性得到了增强(尤其是对铅阳离子)。讨论了传感器在分析应用中的初步结果。