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. 2023 Jul 10;145(28):15162–15170. doi: 10.1021/jacs.3c01576

Figure 3.

Figure 3

Bottom-up synthesis of 5-oGNRs. (A) STM topographic image of a self-assembled island of molecular precursor 1b on Au(111) (Vs = 0.05 V, It = 20 pA). (B) STM topographic image of a high coverage sample of 5-oGNRs following annealing to 350 °C (Vs = 0.05 V, It = 20 pA). (C and D) BRSTM and Laplace-filtered BRSTM image of a 5-oGNR segment showing the 5-membered rings resulting from the fusion of [4]helicene groups along the oGNR edges (Vs = 0.01 V, It = 400 pA). (E) Schematic representation of the stepwise thermally induced cyclodehydrogenation that gives rise to 5-oGNRs.