Reactions of radical anions. Part XIV. An electron spin resonance study of the radical anions of 9,9′-azophenanthrene and 9,9′-azoanthracene

Abstract

The effect of temperature on the disproportionation equilibrium of the radical anions of 9,9′-azophenanthrene and 9,9′-azoanthracene in tetrahydrofuran, with various alkali metals as gegenions, has been determined by measurement of the radical-anion concentration at different temperatures, using electron spin resonance spectroscopy. The e.s.r. spectra were also obtained and analysed for these radical anions and the splitting constants assigned, using simple Hückel and McLachlan molecular orbital theory.