An optical pH probe is a simple and effective tool for determining an accurate pH value in its localized area. However, basic pH probes with pKBH+ values above 8 have rarely been reported, although many components with high pKa such as arginine play important roles in vivo. Herein, we introduce novel colorimetric and fluorescent basic probes 1–5, which are designed using push–pull-type aminoquinoline and aminobenzoquinoline fluorophores, with pKBH+ values ranging from 8.4 to 9.9. After the basicity of the remarkably sensitive basic probe 4 was tuned, it was able to successfully distinguish between the pKa values of MeOH (15.5) and EtOH (15.9), thus displaying selective protonation and fluorescence enhancement in MeOH over EtOH. Our pH probes can be used to detect MeOH poisoning in commercial EtOH products such as hand sanitizers, providing an effective solution to this problem observed during the COVID-19 pandemic.
光学 pH 探针是一种简单有效的工具,可用于确定其局部区域的准确 pH 值。然而,pKBH+ 值高于 8 的碱性 pH 探针却鲜有报道,尽管精
氨酸等许多具有高 pKa 的成分在体内发挥着重要作用。在此,我们介绍了新型比色和荧光碱性探针 1-5,它们是利用推拉型
氨基
喹啉和
氨基苯并
喹啉荧光团设计的,pKBH+ 值范围在 8.4 到 9.9 之间。在对灵敏度极高的碱性探针 4 的碱性进行调整后,它能够成功区分 MeOH(15.5)和 EtOH(15.9)的 pKa 值,从而在 MeOH 中比在 EtOH 中显示出选择性质子化和荧光增强。我们的pH探针可用于检测EtOH商用产品(如洗手液)中的MeOH中毒,为解决COVID-19大流行期间发现的这一问题提供了有效的解决方案。