Emission characteristics of new laser dyes for the green and red spectral regions was written by Krymova, A. I.;Petukhov, V. A.;Popov, M. B.. And the article was included in Kvantovaya Elektronika (Moscow) in 1985.SDS of cas: 51473-74-6 This article mentions the following:
Emission characteristics were studies of solutions of certain new dyes from the classes of coumarins, naphthalimides, and benzanthrones under transverse pumping by the ruby laser 2nd-harmonic radiation. Most of the compounds showed laser action in the blue, green, and red spectral regions. A comparison was made of these substances with laser dyes widely used in the given spectral intervals. Compounds were found the lasing efficiency of which exceeds substantially that of uranin in the green region and that of Cresyl Violet in the red region and which are not inferior to them by photostability. In the experiment, the researchers used many compounds, for example, 7-(Diethylamino)-2-oxo-2H-chromene-3-carbonitrile (cas: 51473-74-6SDS of cas: 51473-74-6).
7-(Diethylamino)-2-oxo-2H-chromene-3-carbonitrile (cas: 51473-74-6) belongs to nitriles. Nitriles are polar, as indicated by high dipole moments. As liquids, they have high relative permittivities, often in the 30s. Alkyl nitriles are sufficiently acidic to undergo deprotonation of the C-H bond adjacent to the CN group.Strong bases are required, such as lithium diisopropylamide and butyl lithium. The product is referred to as a nitrile anion. SDS of cas: 51473-74-6
Referemce:
Nitrile – Wikipedia,
Nitriles – Chemistry LibreTexts