Fig. 2: Self-assembly structures of EHBP upon deposition on a clean Ag(100) substrate.

a, c With the substrate held at 150 K and room temperature, respectively, either tetrameric units (insets) or extended networks evolve. b, d The models for vertices occurring in (a) and (c) explain the respective structural arrangements stabilized by different hydrogen bonding schemes. Tunneling parameters: a and b It = 1 nA, Vs = −100 mV.