Synthesis of 2-azastilbene derivatives with intramolecular charge transfer was written by Kokars, V.;Yanishevskii, A.;Kampars, V.. And the article was included in Chemistry of Heterocyclic Compounds (New York, NY, United States)(Translation of Khimiya Geterotsiklicheskikh Soedinenii) in 2002.Formula: C7H5N3O2 This article mentions the following:
The condensation reaction of 2-cyanomethyl-5-nitropyridine with benzaldehydes 4-RC6H4CHO (R = H, Cl, NMe2, OMe, cyano) gave 2-azastilbene derivatives I. The electronic absorption spectra of these compounds showed intramol. charge-transfer, which depends on the ionization potential of the donor fragment, i.e. the σ+-constant of the R substituent. Introduction of the heteroatom into the acceptor part when changing from the stilbene to the 2-azastilbene system is accompanied by a decrease in the energy and increase in the intensity of the charge-transfer electronic transition. In the experiment, the researchers used many compounds, for example, 2-(5-Nitro-2-pyridinyl)acetonitrile (cas: 123846-66-2Formula: C7H5N3O2).
2-(5-Nitro-2-pyridinyl)acetonitrile (cas: 123846-66-2) belongs to nitriles. Nitrile function is a very important functional group because it can be manipulated to other functional groups such as carboxylic acid by hydrolysis or amine by reduction, respectively. Some nitriles are manufactured by heating carboxylic acids with ammonia in the presence of catalysts. This process is used to make nitriles from natural fats and oils, the products being used as softening agents in synthetic rubbers, plastics, and textiles and for making amines.Formula: C7H5N3O2
Referemce:
Nitrile – Wikipedia,
Nitriles – Chemistry LibreTexts