Stable radical cations based on indolo[3,2,1-jk]carbazole: synthesis, characterization, and theoretical calculation

Abstract

Two indolo[3,2,1-jk]carbazole-based nitrogen-doped π-conjugated radicals with para- and meta-linked topologies exhibit strikingly different solid-state packing modes. Rational design of nitrogen positioning dictates monomeric versus dimeric radical organization, leading to distinct charge delocalization and temperature-dependent magnetic behaviors. This work highlights molecular topology as an effective handle for controlling three-dimensional solid-state arrangements.