Electron spin resonance spectra of quinoline N-oxide radical anion and of its monomethyl derivatives

Abstract

The e.s.r. spectrum of quinoline N-oxide was obtained and completely analysed. The assignment of the a_H hyperfine splittings to the different ring protons has been performed by means of monomethyl derivatives. Calculated spin density distribution seems to agree reasonably well with the experimental coupling constants. The choice of the Q parameters employed for predicting the a_N values in N-oxide derivatives is discussed.