Novel fluorogenic coumarin derivatives appending 15-crown-5 ether as more active catalytic site were designed and synthesized for the fluorescence derivatization of carboxylic acids. From the stability constants (Ks) for complexation with metal acetates in methanol, it was found that their catalytic abilities were superior to the corresponding benzo-15-crown-5 ether type reagent. However, the reactivity of these reagents in the derivatization of lauric acid was dependent on not only the catalytic ability of the introduced crown-ether but also on the appending position of that in a reagent molecule. Furthermore, the derivatized products showed remarkably high fluorescence quantum yields of above 0.8 in methanol and acetonitrile. Allowing to hold a certain function such as catalyst in a reagent molecule should serve as a new strategy for the development of excellent analytical reagents.
研究人员设计并合成了新型含
氟香豆素衍
生物,并将 15-
冠醚作为更活跃的催化位点,用于
羧酸的荧光衍生化。从与
金属
醋酸盐在
甲醇中络合的稳定常数(Ks)来看,它们的催化能力优于相应的苯并-15-
冠醚-5 型试剂。不过,这些试剂在
月桂酸衍生化过程中的反应活性不仅取决于引入的
冠醚的催化能力,还取决于
冠醚在试剂分子中的附加位置。此外,衍生产物在
甲醇和
乙腈中的荧光量子产率明显高于 0.8。允许在试剂分子中保留催化剂等特定功能应成为开发优良
分析试剂的新策略。