Fig. 3
From: Selective on-surface covalent coupling based on metal-organic coordination template
Uncontrolled debrominated aryl-aryl coupling reaction. a STM overview of the sample after annealing at 661 K. b–g Three typical conjugated sub-structures and the corresponding structural models. The conformations of bpy fragments are highlighted by ovals in different colors (trans, blue; cis, green). Different as-formed bpy-bpy connections are observed, namely trans-trans, trans-cis and cis-cis. h Statistic analysis of the molecular conformers (based on the conformations of tpy terminals). i Statistic analysis of the three typical C-C coupling modes of the bpy-bpy connections. Scale bars: (a) 5 nm; (b, d, and f) 2 nm. Data acquisition conditions (T = 293 K): (a) −1.0 V, 0.4 nA; (b) −0.5 V, 0.2 nA; (d) −0.6 V, 0.15 nA; (f) −0.5 V, 0.08 nA
