J. Lorenc, A. Puszko
Jun 1, 1998
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Journal
Chemistry of Heterocyclic Compounds
Abstract
The UV spectra of 15 2-N-substituted 4-nitropicolines and their N-oxides in ethanol have been determined. The spectra of all investigated compounds with the exception of 2-alkylnitramino-4-nitropicolines contain three main bands: two absorption bands are attributed to π→π* excitation of the π-electron of the aromatic system. The third ICT in the longest wavelength region is assigned to the 4-nitro group via the pyridine ring. The bands in the spectra of 3-methyl derivatives are characterized by smaller intensity than 5-methyl derivatives due to the disturbance of the mutual electronic interaction of the substituent by the stericortho effect.