Figure 1
From: On-Surface Synthesis within a Porphyrin Nanoring Template
Chemical structures and STM characterisation of the TIPB and c-P40 molecular species. (a) Schematic diagram of the TIPB Ullmann-type coupling reaction forming covalently bonded structures. (b) Chemical structure of the c-P40 nanoring. (c) Schematic showing a c-P40 ring with examples of covalently bonded structures which may be formed via Ullmann-type coupling of TIPB inside the ring. (d) STM image of the self-assembled TIPB zigzag structures formed on the Au(111) surface; demonstrating that iodine has not dissociated from the molecules (Iset = 30 pA, V = −1.8 V). (e) STM image showing a region of the two-dimensional extended network of covalently bonded TPB formed on Au(111) following activation of the on-surface reaction (Iset = 50 pA, V = 1.8 V). (f) STM image of a stack of c-P40 nanorings on Ag(111) showing clear resolution of individual porphyrin units (Iset = 10 pA, V = −1.8 V).
