7-(DIETHYLAMINO)COUMARIN-3-CARBOXYLIC ACID ETHYL ESTER

7-(Diethylamino)coumarin-3-carboxylic acid ethyl ester (CAS 28705-46-6) is a classic high-performance fluorescent coumarin dye engineered for laser technology, bioimaging applications, and optoelectronic materials research. This molecule integrates a 7-diethylaminocoumarin core—a privileged fluorophore scaffold renowned for high quantum yield, photostability, and tunable emission—with an ethyl ester substituent at the C3 position. The strong electron-donating diethylamino group at C7 coupled with the electron-withdrawing ester at C3 creates an efficient intramolecular charge transfer (ICT) system, resulting in bright blue-green fluorescence with excellent solvatochromic properties. The ethyl ester moiety provides enhanced lipophilicity compared to the free acid analog, facilitating membrane permeability for cellular imaging applications, while also serving as a synthetic handle for further derivatization via hydrolysis or transesterification. This intermediate is particularly valuable for constructing tunable laser dyes, fluorescent probes for protein/DNA labeling, FRET pair donors, and organic semiconductor materials where precise wavelength control and robust fluorescence performance are critical. Manufactured under controlled conditions, it supports research programs requiring reliable fluorescent standards with well-characterized photophysical properties.