Fig. 1: Magnetic coupling in triangulene dimers and trimers.
From: On-surface synthesis of triangulene trimers via dehydration reaction
a Chemical structure of triangulene with unpaired electrons. Two interpenetrating triangular sublattices highlighted as blue and red filled circles giving Sā=ā1 magnetic ground state. The symbols A and B are represented as carbon atoms of two interpenetrating sublattices in the nanographene structure. b Schematic drawings for two kinds of triangulene dimers with antiferromagetic ordering. c Schematic drawings for triangulene trimers connected with benzene or triazine ring. The net sublattice imbalance of six in these structures give rise to Sā=ā3 high-spin ground state. The filling colors in triangulenes denote their ferromagnetic or antiferromagnetic couplings.
