“…Phenazines are tricyclic dibenzannulated heterocycles containing a central pyrazine core, well-known as naturally occurring substances, biologically active species, and dyestuffs (e.g., safranine, neutral red). − Beyond being popular chromophores, their unique optical and electrochemical properties allowed for their use as chemosensors , or photocatalysts for photopolymerization or cross-coupling reactions. − In organic electronics, phenazines have demonstrated their potential as low-bandgap semiconductors in solar cells , and as electroactive compounds in batteries. , They have also found a particular interest for the elaboration of organic light-emitting diodes (OLEDs), notably due to the rigidity and electron-withdrawing character of the phenazine core, which is beneficial for designing thermally activated delayed fluorescent dyes, as exemplified with the recent report of sterically hindered tetrabenzophenazine-phenoxazines that afforded efficient orange-red OLEDs . Furthermore, the straightforward synthesis of simple phenazines through polycondensation reactions enables the preparation of various π-extended planar chromophores derived from azaacenes, and this motif can be found in many polyaromatic heterocyclic nanographenes, two-dimensional conjugated macrocycles, 3D porous architectures, − as well as helicoidal derivatives. , …”