Electronic absorption spectra of some new heterocyclic azomethines derived from nitroso and active methyl compounds

Article abstract of DOI:10.1016/0584-8539(85)80128-8

The electronic spectra of some new heterocyclic azomethines derived from nitroso compounds and active methyl heterocyclic quaternary salts were studied.The main visible band appearing in the spectra of dialkylamino derivatives is assigned to an intramolecular charge transfer (CT) transition.On the other hand the visible spectra of o-hydroxy compounds are interpreted on the principle of the possible existence of such compounds in a enol <*> keto tautomeric equilibrium.In addition the pK_a values of these compounds were determined and discussed in terms of molecular structure.