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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
The enhancement of the fluorescence intensity of the coumarins studied (10 µM) in the presence of 4-amino-TEMPO (100 µM) in aqueous solutions. Each experiment was carried out three times, while fluorescence intensity values were the average of 15 measurements.