Calculation of electronic spectra of azabenzenes and azanaphthalenes by a simplified version of the Pariser-Parr-Pople method was written by Favini, Giorgio;Vandoni, Ida;Simonetta, Massimo. And the article was included in Theoretica Chimica Acta in 1965.SDS of cas: 322-46-3 This article mentions the following:
The simplified version given by Heilbronner, et al. (CA 60, 15160h) of the Pariser-Parr-Pople treatment was used to calculate transition energies and intensities of the π – π* bands in the electronic spectra of 31 azines (azabenzenes and azanaphthalenes). A comparison with exptl. data results in a better agreement than for the complete treatment. In the experiment, the researchers used many compounds, for example, Pyrido[2,3-b]pyrazine (cas: 322-46-3SDS of cas: 322-46-3).
Pyrido[2,3-b]pyrazine (cas: 322-46-3) belongs to pyrazine derivatives. Pyrazine is a symmetrical molecule with point group D2h. Pyrazine is less basic than pyridine, pyridazine and pyrimidine. Pyrazine and a variety of alkylpyrazines are flavor and aroma compounds found in baked and roasted goods. Tetramethylpyrazine (also known as ligustrazine) is reported to scavenge superoxide anion and decrease nitric oxide production in human Granulocytes.SDS of cas: 322-46-3