Xanthene‐based Fluorescence Turn‐on Probe for Highly Acidic pH Range in Aqueous Solution
作者:Bhanu Priya、Vibha Mahajan、Naresh Kumar、Roopa
DOI:10.1007/s10895-021-02723-2
日期:2021.5
exhibited quenched fluorescence as long as it is present in neutral or moderately acidic conditions. However, in the highly acidic pH range, it displayed a strong red-colored fluorescence at 592 nm as the protonation of dipropylaniline moiety inhibits the PET process. A model probe Xanth-M without any PET promoting unit was also synthesized. The model probe along with theoretical calculations was employed
基于x吨的探针Xanth-NPr被开发为分子系统,该分子系统对具有荧光开启行为的高酸性环境表现出敏感性。Xanth-NPr是根据光致电子转移(PET)原理设计的,该原理可控制探针的荧光分布。Xanth-NPr的结构包含二丙基苯胺基团作为PET促进单元。只要Xanth-NPr存在于中性或中度酸性条件下,它就会显示出淬灭的荧光。但是,在高酸性pH范围内,由于二丙基苯胺部分的质子化抑制了PET的过程,它在592 nm处显示了强烈的红色荧光。还合成了没有任何PET促进单元的模型探针Xanth-M。使用模型探针以及理论计算来解释PET工艺在调节Xanth-NPr荧光行为中的作用。Xanth-NPr在1至4.1范围内随pH呈线性荧光响应,随pH的变化而变化。K的值为2.72。同样,其荧光分布不会因存在生物学相关阳离子而改变。