Die additive Zusammensetzung der UV-Spektren phenolischer Mehrkernverbindungen mit Nitrogruppen aus den Spektren entsprechend substituierter Nitrophenole

Abstract

The spectra of some nitrated phenolic di-, tri- and tetra nuclear compounds were measured in the visible and near u.v. spectral range. These spectra were compared with those obtained of the corresponding nitrophenols from which the oligo nuclear compounds were formed. Dioxane and an aqueous solution of sodium hydroxide were used as solvents. In the latter the compounds were completely dissociated. It could be shown that over the whole spectral range the spectra of the oligo nuclear compounds can be pretty well composed by summing up the spectra of the corresponding phenolic mono nuclear compounds if these compounds contain a methyl group instead of the methylen bridge. The calculated and measured u.v. spectra match almost perfectly if they were taken in aqueous sodium hydroxide solution. In dioxane the wave lengths of the absorption maxima match pretty well also but the extinction coefficients of the maxima deviate up to ± 12 per cent comparing the calculated and measured spectra.