کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5287658 | 1385811 | 2005 | 4 صفحه PDF | دانلود رایگان |
The efficient synthesis of a series of novel side-chain carboxylated 5,9-diaminobenzo[a]phenoxazinium salts is described. The ring system was prepared by the reaction of 5-alkylamino-2-nitrosophenol hydrochlorides with the appropriate N-alkylated-naphthylamine. Evaluation of the visible and fluorescence properties of the cationic dyes was carried out in ethanol and water at physiological pH. In both solvents they showed intense visible absorption maxima in the range 500-638Â nm (ethanol) and 625-650 (water), and fluoresced strongly, with fluorescence maxima from 612 to 669Â nm (ethanol) and from 654 to 685Â nm (water). A wide variation in fluorescence quantum yields is observed, ranging from 0.051 to 0.50 and 0.065 to 0.32 in ethanol and water, respectively.
Journal: Tetrahedron Letters - Volume 46, Issue 30, 25 July 2005, Pages 4949-4952