On March 31, 2000, Asiri, Abdullah Mohamed published an article.SDS of cas: 2510-01-2 The title of the article was Synthesis, characterizations and absorption spectral properties of new styryl dyes derived from 1-dicyanomethyleneindane. And the article contained the following:
The synthesis and the absorption properties of methine dyes formed by the Knoevenagel condensation of aromatic aldehydes with 1-(dicyanomethylene)indan afforded a novel series of dyes absorbing in the region of 490-593 nm. The substituents on the aromatic aldehyde have remarkable effects on the visible absorption maxima of the new dyes. Indole-3-carboxaldehyde gave a blue dye. The introduction of dicyanomethylene group into 1-indanone causes a large bathochromic shift of the visible absorption maxima of the new dyes when compared with the same dye obtained from 1-indanone itself. Steric effects cause even more of a bathochromic shift compared dyes having substituents in the ortho position and the same dyes having the same substituents in the para position. Increasing the solvent polarity had pronounced effects on the absorption maxima. The experimental process involved the reaction of 2-(2,3-Dihydro-1H-inden-1-ylidene)malononitrile(cas: 2510-01-2).SDS of cas: 2510-01-2
The Article related to styryl dye preparation spectra substituent effect, dicyanomethylenedindan knoevenagel reaction methine dye preparation, Dyes, Organic Pigments, Fluorescent Brighteners, and Photographic Sensitizers: Photographic Dyes, Dye Intermediates, and Sensitizers and other aspects.SDS of cas: 2510-01-2
Referemce:
Nitrile – Wikipedia,
Nitriles – Chemistry LibreTexts