Fluorescence Sensor Performance of a New Fluorescein Derivate: [2-Morpholine-4-(6-chlorine-1,3,5-s-triazine)-amino]fluorescein

摘要

A novel reactive fluorescent dye [2-morpholine-4-(6-chlorine-1,3,5-s-triazine)-amino]fluorescein based on 5-aminofluorescein was synthesized by electrophilic substitution. The photophysical properties, solvent effect, pH value sensitivity, and metal ions responsibility of this new fluorophore were investigated. Compared with 5-aminofluorescein, the novel fluorophore exhibited stronger fluorescence and longer lifetime. The fluorescence property of the new dye was obviously affected by different solvents and pH values, and it showed stronger fluorescence in the protic solvents or an alkaline environment. Moreover, the fluorescent intensity could be enhanced by the formation of complex with metal ions especially with Mg2+. The results show that the fluorescent dye is a promising efficient sensor for solvents, protons, and metal ions.