The reactions of radical anions. Part V. Disproportionation of the radical anion of azobenzene

Abstract

The effect of temperature on the disproportionation equilibrium of the radical anion of azobenzene in tetrahydrofuran has been examined by determining the radical-anion concentration at different temperatures by electron spin resonance. The following values were obtained at 0° for the disproportionation: with Li+ as gegen ion, ΔG°= 0·15 kcal. mole–1, ΔH°=–2·2 kcal. mole–1, ΔS°=–8·5 cal. mole–1 deg.–1; with Na+ as gegen ion, ΔG°= 1·25 kcal. mole–1; ΔH°=–4·3 kcal. mole–1; ΔS°=–20·1 cal. mole–1 deg.–1.