Stable neutral radicals based on the polyazaacene skeleton that exhibit high electrochemical amphotericity

Upon the one-electron reduction of N-methylquinoxalino[2,3-b]quinoxaliniums 2, neutral radicals 1 without any bulky protecting groups were generated and isolated as stable solids, which exhibit electric conductivity (σ = 10−7−10−9 S cm−1) as a single-component organic material due to high electrochemical amphotericity (ΔE = ca. 0.9 V).